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Bài tập Lũy thừa với số mũ tự nhiên (8)

Bài tập Lũy thừa với số mũ tự nhiên (8)

Bài 71 : Tính tổng S = 4 + 4 2 + 4 3 + … + 4 2017 chưa có đáp án Bài 72 : Tính tổng S = 5 + 5 2 + 5 3 + … + 5 2017 chưa có đáp án Bà...

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Bài tập Lũy thừa với số mũ tự nhiên (8)

Bài tập Lũy thừa với số mũ tự nhiên (8)

Bài 71 : Tính tổng S = 4 + 4 2 + 4 3 + … + 4 2017 chưa có đáp án Bài 72 : Tính tổng S = 5 + 5 2 + 5 3 + … + 5 2017 ...

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Bài tập Lũy thừa với số mũ tự nhiên (7)

<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjpmcVTP0leeudWbJ2c-KU3Lw3XCS3ni2Bzws-lA5jHbesZl0Acv16VRJwqj-kuVt1WOFdINOgkaAD2Ki53AFrM2V-EUBEHC9yI7KgaWlcgySI4cY9WnIjcaqm52AHFL_2YlsHrV2P9oLJQcIE0aI-_uE2e62y6and5AsI_oiN_RNCCqSsit5oMUwmpn9sF/s287/luy%20thua.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="285" data-original-width="287" height="285" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjpmcVTP0leeudWbJ2c-KU3Lw3XCS3ni2Bzws-lA5jHbesZl0Acv16VRJwqj-kuVt1WOFdINOgkaAD2Ki53AFrM2V-EUBEHC9yI7KgaWlcgySI4cY9WnIjcaqm52AHFL_2YlsHrV2P9oLJQcIE0aI-_uE2e62y6and5AsI_oiN_RNCCqSsit5oMUwmpn9sF/s1600/luy%20thua.jpg" width="287" /></a></div><div class="separator" style="clear: both; text-align: left;"> </div> <div> </div>Bài 61: So sánh 26 và 62 <div> <div> <input 1="" onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = ''; this.value = 'Ẩn'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'XEM'; }" style="font-size: 11px; margin: 0px; padding: 4px; width: 75px;" type="button" value="XEM" /> </div> <div> <div style="background: #; border: 1px solid rgb(79, 79, 79); display: none; padding: 4px;"> 26 = 64 và 62 = 36 nên 26> 62 </div> </div></div> <div> </div>Bài 62: So sánh A = 2009.2011 và B = 20102 <div> <div> <input 1="" onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = ''; this.value = 'Ẩn'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'XEM'; }" style="font-size: 11px; margin: 0px; padding: 4px; width: 75px;" type="button" value="XEM" /> </div> <div> <div style="background: #; border: 1px solid rgb(79, 79, 79); display: none; padding: 4px;"> b)      A = 2009.2011 vàB = 20102 Có B = 20102 = 2010.2010 = (2009 + D.2010 = 2009.2010 + 2010 = 2009.(2011 -1)+ 2010 = 2009.2011 +2010-2009 = 2009.2011 + 1 >A </div> </div></div> <div> </div>Bài 63: So sánh A = 2015.2017 và B = 2016.2016 <div> <div> <input 1="" onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = ''; this.value = 'Ẩn'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'XEM'; }" style="font-size: 11px; margin: 0px; padding: 4px; width: 75px;" type="button" value="XEM" /> </div> <div> <div style="background: #; border: 1px solid rgb(79, 79, 79); display: none; padding: 4px;"> <p class="Bodytext0" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; margin-left: 0cm; text-indent: 0cm;">b)      A = 2015.2017 và B = 2016.2016<p class="Bodytext0" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial;">Có B = 2016.2016 = (2015 + D.2016 = 2015.2016 + 2016<p class="Bodytext0" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; margin-left: 0cm; mso-list: l0 level1 lfo1; tab-stops: 21.25pt; text-indent: 0cm;"> <p class="Bodytext0" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial;">= 2015.(2017 - 1) + 2016 = 2015.2017 + 1 >A </div> </div></div> <div> </div>Bài 64: So sánh 20170 và 12017 <div> <div> <input 1="" onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = ''; this.value = 'Ẩn'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'XEM'; }" style="font-size: 11px; margin: 0px; padding: 4px; width: 75px;" type="button" value="XEM" /> </div> <div> <div style="background: #; border: 1px solid rgb(79, 79, 79); display: none; padding: 4px;"> <p class="Bodytext0" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; margin-left: 0cm; text-indent: 0cm;"><p class="Bodytext0" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; margin-left: 0cm; text-indent: 0cm;">b)       Có 2017° = 1 và l2017 = 1 nên 2017° = l2017 </div> </div></div> <div> </div>Bài 65: Cho A = 1 + 21 + 22 + 23 + … + 22007<o:p></o:p>a) Tính 2Ab) Chứng minh : A = 22008 – 1  <div> <div> <input 1="" onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = ''; this.value = 'Ẩn'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'XEM'; }" style="font-size: 11px; margin: 0px; padding: 4px; width: 75px;" type="button" value="XEM" /> </div> <div> <div style="background: #; border: 1px solid rgb(79, 79, 79); display: none; padding: 4px;"> <p class="Bodytext0" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; margin-left: 0cm; text-indent: 0cm;"><p class="Bodytext0" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; margin-left: 0cm; text-indent: 0cm;">a)    a) 2A= 2.(1+21+22+23+….+22007  = 21+22+….+22008<o:p></o:p> b)    b) 2A –A = A = 21+22+….+22018 – ( 1+21+22+23+…+22008) = 22008 -1<o:p></o:p> </div> </div></div> <div> </div>Bài 66:Cho A = 1 + 3 + 32 + 33 + 34 + 35 + 36 + 37<o:p></o:p>a) Tính 3A b) Chứng minh A = (38 – 1) : 2 <div> <div> <input 1="" onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = ''; this.value = 'Ẩn'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'XEM'; }" style="font-size: 11px; margin: 0px; padding: 4px; width: 75px;" type="button" value="XEM" /> </div> <div> <div style="background: #; border: 1px solid rgb(79, 79, 79); display: none; padding: 4px;"> <p class="Bodytext0" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; margin-left: 0cm; text-indent: 0cm;"><p class="Bodytext0" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; margin-left: 0cm; text-indent: 0cm;">a)    3A = 3. (1+3+32+33+34+35+36+37)=3+32+33+34+35+36+37+38<o:p></o:p>b)    3A –A = 2A = 3+32+33+34+35+36+37+38-(1+3+32+33+34+35+36+37)=38-1<o:p></o:p> Suy ra A= (38-1):2<o:p></o:p> </div> </div></div> <div> </div>Bài 67: Cho B = 1 + 3 + 32 + … + 32006<o:p></o:p>a) Tính 3Bb) Chứng minh: A = (32007 – 1) : 2 <div> <div> <input 1="" onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = ''; this.value = 'Ẩn'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'XEM'; }" style="font-size: 11px; margin: 0px; padding: 4px; width: 75px;" type="button" value="XEM" /> </div> <div> <div style="background: #; border: 1px solid rgb(79, 79, 79); display: none; padding: 4px;"> chưa có đáp án </div> </div></div> <div> </div>Bài 68: Cho C = 1 + 4 + 42 + 43 + 45 + 46<o:p></o:p>a) Tính 4C b) Chứng minh: A = (47 – 1) : 3  <div> <div> <input 1="" onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = ''; this.value = 'Ẩn'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'XEM'; }" style="font-size: 11px; margin: 0px; padding: 4px; width: 75px;" type="button" value="XEM" /> </div> <div> <div style="background: #; border: 1px solid rgb(79, 79, 79); display: none; padding: 4px;"> chưa có đáp án </div> </div></div> <div> </div>Bài 69: Tính tổng S = 1 + 2 + 22 + 23 + … + 22017  <div> <div> <input 1="" onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = ''; this.value = 'Ẩn'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'XEM'; }" style="font-size: 11px; margin: 0px; padding: 4px; width: 75px;" type="button" value="XEM" /> </div> <div> <div style="background: #; border: 1px solid rgb(79, 79, 79); display: none; padding: 4px;"> chưa có đáp án </div> </div></div> <div> </div>Bài 70: Tính tổng S = 3 + 32 + 33 + ….+ 32017  <div> <div> <input 1="" onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = ''; this.value = 'Ẩn'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'XEM'; }" style="font-size: 11px; margin: 0px; padding: 4px; width: 75px;" type="button" value="XEM" /> </div> <div> <div style="background: #; border: 1px solid rgb(79, 79, 79); display: none; padding: 4px;"> chưa có đáp án </div> </div></div>

Bài tập Lũy thừa với số mũ tự nhiên (7)

Bài 61: So sánh 2 6 và 6 2 2 6 = 64 và 6 2 = 36 nên 2 6 > 6 2 Bài 62: So sánh A = 2009.2011 và B = 20102 b) A = 2009.2011 vàB ...

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Bài tập Lũy thừa với số mũ tự nhiên (7)

Có
B = 20102 = 2010.2010 = (2009 + D.2010 = 2009.2010 + 2010

= 2009.(2011 -1)+ 2010 = 2009.2011 +2010-2009 = 2009.2011 +
1 >A 
</div>
</div></div>
<div> </div>Bài 63: So sánh A = 2015.2017 và B = 2016.2016
<div>
<div>
<input 1="" onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = ''; this.value = 'Ẩn'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'XEM'; }" style="font-size: 11px; margin: 0px; padding: 4px; width: 75px;" type="button" value="XEM" />
</div>
<div>
<div style="background: #; border: 1px solid rgb(79, 79, 79); display: none; padding: 4px;">
<p class="Bodytext0" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; margin-left: 0cm; text-indent: 0cm;">b)     
A = 2015.2017 và B = 2016.2016<p class="Bodytext0" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial;">Có
B = 2016.2016 = (2015 + D.2016 = 2015.2016 + 2016<p class="Bodytext0" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; margin-left: 0cm; mso-list: l0 level1 lfo1; tab-stops: 21.25pt; text-indent: 0cm;">

<p class="Bodytext0" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial;">=
2015.(2017 - 1) + 2016 = 2015.2017 + 1 >A
</div>
</div></div>
<div> </div>Bài 64: So sánh 20170 và 12017
<div>
<div>
<input 1="" onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = ''; this.value = 'Ẩn'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'XEM'; }" style="font-size: 11px; margin: 0px; padding: 4px; width: 75px;" type="button" value="XEM" />
</div>
<div>
<div style="background: #; border: 1px solid rgb(79, 79, 79); display: none; padding: 4px;">
<p class="Bodytext0" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; margin-left: 0cm; text-indent: 0cm;"><p class="Bodytext0" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; margin-left: 0cm; text-indent: 0cm;">b)      
Có 2017° = 1 và l2017
= 1 nên 2017° = l2017
</div>
</div></div>
<div> </div>Bài 65: Cho A = 1 + 21 + 22 + 23 + … + 22007<o:p></o:p>a) Tính 2Ab) Chứng minh : A = 22008 – 1 
<div>
<div>
<input 1="" onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = ''; this.value = 'Ẩn'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'XEM'; }" style="font-size: 11px; margin: 0px; padding: 4px; width: 75px;" type="button" value="XEM" />
</div>
<div>
<div style="background: #; border: 1px solid rgb(79, 79, 79); display: none; padding: 4px;">
<p class="Bodytext0" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; margin-left: 0cm; text-indent: 0cm;"><p class="Bodytext0" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; margin-left: 0cm; text-indent: 0cm;">a)    a) 2A= 2.(1+21+22+23+….+22007
 = 21+22+….+22008<o:p></o:p>

b)    b) 2A –A = A = 21+22+….+22018
– ( 1+21+22+23+…+22008) = 22008
-1<o:p></o:p>
</div>
</div></div>
<div> </div>Bài 66:Cho A = 1 + 3 + 32 + 33 + 34 + 35 + 36 + 37<o:p></o:p>a) Tính 3A b) Chứng minh A = (38 – 1) : 2
<div>
<div>
<input 1="" onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = ''; this.value = 'Ẩn'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'XEM'; }" style="font-size: 11px; margin: 0px; padding: 4px; width: 75px;" type="button" value="XEM" />
</div>
<div>
<div style="background: #; border: 1px solid rgb(79, 79, 79); display: none; padding: 4px;">
<p class="Bodytext0" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; margin-left: 0cm; text-indent: 0cm;"><p class="Bodytext0" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; margin-left: 0cm; text-indent: 0cm;">a)    3A = 3. (1+3+32+33+34+35+36+37)=3+32+33+34+35+36+37+38<o:p></o:p>b)    3A –A = 2A = 3+32+33+34+35+36+37+38-(1+3+32+33+34+35+36+37)=38-1<o:p></o:p>

Suy ra A= (38-1):2<o:p></o:p>
</div>
</div></div>
<div> </div>Bài 67: Cho B = 1 + 3 + 32 + … + 32006<o:p></o:p>a) Tính 3Bb) Chứng minh: A = (32007 – 1) : 2
<div>
<div>
<input 1="" onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = ''; this.value = 'Ẩn'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'XEM'; }" style="font-size: 11px; margin: 0px; padding: 4px; width: 75px;" type="button" value="XEM" />
</div>
<div>
<div style="background: #; border: 1px solid rgb(79, 79, 79); display: none; padding: 4px;">
chưa có đáp án
</div>
</div></div>
<div> </div>Bài 68: Cho C = 1 + 4 + 42 + 43 + 45 + 46<o:p></o:p>a) Tính 4C b) Chứng minh: A = (47 – 1) : 3 
<div>
<div>
<input 1="" onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = ''; this.value = 'Ẩn'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'XEM'; }" style="font-size: 11px; margin: 0px; padding: 4px; width: 75px;" type="button" value="XEM" />
</div>
<div>
<div style="background: #; border: 1px solid rgb(79, 79, 79); display: none; padding: 4px;">
chưa có đáp án
</div>
</div></div>
<div> </div>Bài 69: Tính tổng S = 1 + 2 + 22 + 23 + … + 22017 
<div>
<div>
<input 1="" onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = ''; this.value = 'Ẩn'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'XEM'; }" style="font-size: 11px; margin: 0px; padding: 4px; width: 75px;" type="button" value="XEM" />
</div>
<div>
<div style="background: #; border: 1px solid rgb(79, 79, 79); display: none; padding: 4px;">
chưa có đáp án
</div>
</div></div>
<div> </div>Bài 70: Tính tổng S = 3 + 32 + 33 + ….+ 32017 
<div>
<div>
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Bài tập Lũy thừa với số mũ tự nhiên (7)

Bài 61: So sánh 2 6 và 6 2 2 6 = 64 và 6 2 = 36 nên 2 6 > 6 2 Bài 62: So sánh A = 2009.2011 và B = 20102 b) A...

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Bài tập Lũy thừa với số mũ tự nhiên (6)

<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhD4yrwQyDEWbHUgUUDFYp2GPktUbxHticQfaleErnb2h6oN2l0VJckG9OL4lYDPRFbVj54FZIYNXERq0ph5Ic6IwVaEGrdF_TbtOgZXXfvzP5_u0Enukr2CwwQ97_yPI2Erl5Tmo80v0mGWJHwtHly0wtrx5bU0c6_94POj-Apgr_-Hick2-K2VD34r7TF/s287/luy%20thua.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="285" data-original-width="287" height="285" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhD4yrwQyDEWbHUgUUDFYp2GPktUbxHticQfaleErnb2h6oN2l0VJckG9OL4lYDPRFbVj54FZIYNXERq0ph5Ic6IwVaEGrdF_TbtOgZXXfvzP5_u0Enukr2CwwQ97_yPI2Erl5Tmo80v0mGWJHwtHly0wtrx5bU0c6_94POj-Apgr_-Hick2-K2VD34r7TF/s1600/luy%20thua.jpg" width="287" /></a></div><div class="separator" style="clear: both; text-align: left;"> </div>Bài 51 : Tìm x, biết. 2x – 26 = 6  <div> <div> <input 1="" onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = ''; this.value = 'Ẩn'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'XEM'; }" style="font-size: 11px; margin: 0px; padding: 4px; width: 75px;" type="button" value="XEM" /> </div> <div> <div style="background: #; border: 1px solid rgb(79, 79, 79); display: none; padding: 4px;"> 2x-<msup><mn>2</mn><mrow class="MJX-TeXAtom-ORD"><mn>6</mn></mrow></msup></math>" id="MathJax-Element-2-Frame" role="presentation" style="border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0">26<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px; clip: rect(1px, 1px, 1px, 1px); display: block; height: 1px; left: 0px; margin: 0px; overflow: hidden; padding: 1px 0px 0px; position: absolute; top: 0px; user-select: none; width: 1px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mn>2</mn><mrow class="MJX-TeXAtom-ORD"><mn>6</mn></mrow></msup></math> = 6⇔2x-64=6⇔2x=6+64⇔ 2x=70⇔ x= 35 </div> </div></div> <div> </div>Bài 52 : Tìm x, biết. 64.4x = 45  <div> <div><div> <div> <input 1="" onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = ''; this.value = 'Ẩn'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'XEM'; }" style="font-size: medium; margin: 0px; padding: 4px; width: 75px;" type="button" value="XEM" /> </div> <div> <div style="background: #; border: 1px solid rgb(79, 79, 79); display: none; padding: 4px;"> <mstyle displaystyle="true"><mn>64</mn><mo>.</mo></mstyle></math>" id="MathJax-Element-2-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0">64<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: -0.163em 0px 0px; padding: 0px 0px 0.333em; white-space: pre;">.<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><mn>64</mn><mo>.</mo></mstyle></math><mstyle displaystyle="true"><msup><mn>4</mn><mi>x</mi></msup></mstyle></math>" id="MathJax-Element-3-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.388em 0px 0.333em; white-space: pre;">4<span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.223em 0px 0.278em; white-space: pre;">x<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><msup><mn>4</mn><mi>�</mi></msup></mstyle></math><mstyle displaystyle="true"><mo>=</mo><mn>45</mn></mstyle></math>" id="MathJax-Element-4-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.058em 0px 0.333em; white-space: pre;">=45<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><mo>=</mo><mn>45</mn></mstyle></math>        <mstyle displaystyle="true"><msup><mn>4</mn><mi>x</mi></msup></mstyle></math>" id="MathJax-Element-5-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.388em 0px 0.333em; white-space: pre;">4<span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.223em 0px 0.278em; white-space: pre;">x<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><msup><mn>4</mn><mi>�</mi></msup></mstyle></math> <mstyle displaystyle="true"><mo>=</mo></mstyle></math>" id="MathJax-Element-6-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.058em 0px 0.333em; white-space: pre;">=<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><mo>=</mo></mstyle></math> <mstyle displaystyle="true"><mn>45</mn></mstyle></math>" id="MathJax-Element-7-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0">45<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><mn>45</mn></mstyle></math> <mstyle displaystyle="true"><mo>:</mo></mstyle></math>" id="MathJax-Element-8-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.168em 0px 0.333em; white-space: pre;">:<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><mo>:</mo></mstyle></math> <mstyle displaystyle="true"><mn>64</mn></mstyle></math>" id="MathJax-Element-9-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0">64<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><mn>64</mn></mstyle></math>        <mstyle displaystyle="true"><msup><mn>4</mn><mi>x</mi></msup></mstyle></math>" id="MathJax-Element-10-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.388em 0px 0.333em; white-space: pre;">4<span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.223em 0px 0.278em; white-space: pre;">x<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><msup><mn>4</mn><mi>�</mi></msup></mstyle></math> <mstyle displaystyle="true"><mo>=</mo></mstyle></math>" id="MathJax-Element-11-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.058em 0px 0.333em; white-space: pre;">=<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><mo>=</mo></mstyle></math> <mstyle displaystyle="true"><mfrac><mn>45</mn><mn>64</mn></mfrac></mstyle></math>" id="MathJax-Element-12-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0">4564<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><mfrac><mn>45</mn><mn>64</mn></mfrac></mstyle></math> Vì <mstyle displaystyle="true"><mfrac><mn>45</mn><mn>64</mn></mfrac></mstyle></math>" id="MathJax-Element-13-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0">4564<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><mfrac><mn>45</mn><mn>64</mn></mfrac></mstyle></math> là phân số Mà <mstyle displaystyle="true"><msup><mn>4</mn><mi>x</mi></msup></mstyle></math>" id="MathJax-Element-14-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.388em 0px 0.333em; white-space: pre;">4<span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.223em 0px 0.278em; white-space: pre;">x<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><msup><mn>4</mn><mi>�</mi></msup></mstyle></math> có kết quả là một số nguyên dương. <mstyle displaystyle="true"><mo>&#x21D2;</mo></mstyle></math>" id="MathJax-Element-15-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.223em 0px 0.388em; white-space: pre;">⇒<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><mo>⇒</mo></mstyle></math> <mstyle displaystyle="true"><mi>x</mi></mstyle></math>" id="MathJax-Element-16-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.223em 0px 0.278em; white-space: pre;">x<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><mi>�</mi></mstyle></math> là số nguyên dương <mstyle displaystyle="true"><mo>&#x21D2;</mo><mi>x</mi><mo>&#x2208;</mo><mo>&#xD8;</mo></mstyle></math>" id="MathJax-Element-17-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.223em 0px 0.388em; white-space: pre;">⇒<span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.223em 0px 0.278em; white-space: pre;">x<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.278em 0px 0.388em; white-space: pre;">∈<span class="mjx-charbox MJXc-TeX-unknown-R" style="box-sizing: content-box !important; display: inline-block; font-family: STIXGeneral, "Cambria Math", "Arial Unicode MS", serif; margin: 0px; padding: 0px 0px 0.267em; width: 0.653em;">Ø<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><mo>⇒</mo><mi>�</mi><mo>∈</mo><mo>Ø</mo></mstyle></math> Vậy không có giá trị nào của <mstyle displaystyle="true"><mi>x</mi></mstyle></math>" id="MathJax-Element-18-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.223em 0px 0.278em; white-space: pre;">x<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><mi>�</mi></mstyle></math>. <a style="background-color: #f1f4f8; color: #385898; cursor: pointer; margin: 0px; padding: 0px; text-align: left; white-space: pre-wrap;">Rút gọn</a> </div> </div> <div> <div style="background: #; border: 1px solid rgb(79, 79, 79); display: none; padding: 4px;"> x = 2 </div> </div></div> <div> </div>Bài 53 : Tìm x, biết. 27.3x = 243 <div> <div> <input 1="" onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = ''; this.value = 'Ẩn'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'XEM'; }" style="font-size: 11px; margin: 0px; padding: 4px; width: 75px;" type="button" value="XEM" /> </div> <div> <div style="background: #; border: 1px solid rgb(79, 79, 79); display: none; padding: 4px;"> <mstyle displaystyle="true"><mn>64</mn><mo>.</mo></mstyle></math>" id="MathJax-Element-2-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0">64.<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px; clip: rect(1px, 1px, 1px, 1px); display: block; height: 1px; left: 0px; margin: 0px; overflow: hidden; padding: 1px 0px 0px; position: absolute; top: 0px; user-select: none; width: 1px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><mn>64</mn><mo>.</mo></mstyle></math><mstyle displaystyle="true"><msup><mn>4</mn><mi>x</mi></msup></mstyle></math>" id="MathJax-Element-3-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0">4<span class="mjx-char MJXc-TeX-math-I" face="MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw" style="box-sizing: content-box; display: block; margin: 0px; padding: 0.223em 0px 0.278em; white-space: pre;">x<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px; clip: rect(1px, 1px, 1px, 1px); display: block; height: 1px; left: 0px; margin: 0px; overflow: hidden; padding: 1px 0px 0px; position: absolute; top: 0px; user-select: none; width: 1px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><msup><mn>4</mn><mi>�</mi></msup></mstyle></math><mstyle displaystyle="true"><mo>=</mo><mn>45</mn></mstyle></math>" id="MathJax-Element-4-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0">=45<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px; clip: rect(1px, 1px, 1px, 1px); display: block; height: 1px; left: 0px; margin: 0px; overflow: hidden; padding: 1px 0px 0px; position: absolute; top: 0px; user-select: none; width: 1px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><mo>=</mo><mn>45</mn></mstyle></math>        <mstyle displaystyle="true"><msup><mn>4</mn><mi>x</mi></msup></mstyle></math>" id="MathJax-Element-5-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0">4<span class="mjx-char MJXc-TeX-math-I" face="MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw" style="box-sizing: content-box; display: block; margin: 0px; padding: 0.223em 0px 0.278em; white-space: pre;">x<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px; clip: rect(1px, 1px, 1px, 1px); display: block; height: 1px; left: 0px; margin: 0px; overflow: hidden; padding: 1px 0px 0px; position: absolute; top: 0px; user-select: none; width: 1px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><msup><mn>4</mn><mi>�</mi></msup></mstyle></math> <mstyle displaystyle="true"><mo>=</mo></mstyle></math>" id="MathJax-Element-6-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0">=<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px; clip: rect(1px, 1px, 1px, 1px); display: block; height: 1px; left: 0px; margin: 0px; overflow: hidden; padding: 1px 0px 0px; position: absolute; top: 0px; user-select: none; width: 1px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><mo>=</mo></mstyle></math> <mstyle displaystyle="true"><mn>45</mn></mstyle></math>" id="MathJax-Element-7-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0">45<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px; clip: rect(1px, 1px, 1px, 1px); display: block; height: 1px; left: 0px; margin: 0px; overflow: hidden; padding: 1px 0px 0px; position: absolute; top: 0px; user-select: none; width: 1px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><mn>45</mn></mstyle></math> <mstyle displaystyle="true"><mo>:</mo></mstyle></math>" id="MathJax-Element-8-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0">:<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px; clip: rect(1px, 1px, 1px, 1px); display: block; height: 1px; left: 0px; margin: 0px; overflow: hidden; padding: 1px 0px 0px; position: absolute; top: 0px; user-select: none; width: 1px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><mo>:</mo></mstyle></math> <mstyle displaystyle="true"><mn>64</mn></mstyle></math>" id="MathJax-Element-9-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0">64<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px; clip: rect(1px, 1px, 1px, 1px); display: block; height: 1px; left: 0px; margin: 0px; overflow: hidden; padding: 1px 0px 0px; position: absolute; top: 0px; user-select: none; width: 1px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><mn>64</mn></mstyle></math>        <mstyle displaystyle="true"><msup><mn>4</mn><mi>x</mi></msup></mstyle></math>" id="MathJax-Element-10-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0">4<span class="mjx-char MJXc-TeX-math-I" face="MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw" style="box-sizing: content-box; display: block; margin: 0px; padding: 0.223em 0px 0.278em; white-space: pre;">x<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px; clip: rect(1px, 1px, 1px, 1px); display: block; height: 1px; left: 0px; margin: 0px; overflow: hidden; padding: 1px 0px 0px; position: absolute; top: 0px; user-select: none; width: 1px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><msup><mn>4</mn><mi>�</mi></msup></mstyle></math> <mstyle displaystyle="true"><mo>=</mo></mstyle></math>" id="MathJax-Element-11-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0">=<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px; clip: rect(1px, 1px, 1px, 1px); display: block; height: 1px; left: 0px; margin: 0px; overflow: hidden; padding: 1px 0px 0px; position: absolute; top: 0px; user-select: none; width: 1px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><mo>=</mo></mstyle></math> <mstyle displaystyle="true"><mfrac><mn>45</mn><mn>64</mn></mfrac></mstyle></math>" id="MathJax-Element-12-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0">4564<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px; clip: rect(1px, 1px, 1px, 1px); display: block; height: 1px; left: 0px; margin: 0px; overflow: hidden; padding: 1px 0px 0px; position: absolute; top: 0px; user-select: none; width: 1px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><mfrac><mn>45</mn><mn>64</mn></mfrac></mstyle></math> Vì <mstyle displaystyle="true"><mfrac><mn>45</mn><mn>64</mn></mfrac></mstyle></math>" id="MathJax-Element-13-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0">4564<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px; clip: rect(1px, 1px, 1px, 1px); display: block; height: 1px; left: 0px; margin: 0px; overflow: hidden; padding: 1px 0px 0px; position: absolute; top: 0px; user-select: none; width: 1px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><mfrac><mn>45</mn><mn>64</mn></mfrac></mstyle></math> là phân số Mà <mstyle displaystyle="true"><msup><mn>4</mn><mi>x</mi></msup></mstyle></math>" id="MathJax-Element-14-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0">4<span class="mjx-char MJXc-TeX-math-I" face="MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw" style="box-sizing: content-box; display: block; margin: 0px; padding: 0.223em 0px 0.278em; white-space: pre;">x<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px; clip: rect(1px, 1px, 1px, 1px); display: block; height: 1px; left: 0px; margin: 0px; overflow: hidden; padding: 1px 0px 0px; position: absolute; top: 0px; user-select: none; width: 1px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><msup><mn>4</mn><mi>�</mi></msup></mstyle></math> có kết quả là một số nguyên dương. <mstyle displaystyle="true"><mo>&#x21D2;</mo></mstyle></math>" id="MathJax-Element-15-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0">⇒<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px; clip: rect(1px, 1px, 1px, 1px); display: block; height: 1px; left: 0px; margin: 0px; overflow: hidden; padding: 1px 0px 0px; position: absolute; top: 0px; user-select: none; width: 1px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><mo>⇒</mo></mstyle></math> <mstyle displaystyle="true"><mi>x</mi></mstyle></math>" id="MathJax-Element-16-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0"><span class="mjx-char MJXc-TeX-math-I" face="MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw" style="box-sizing: content-box; display: block; margin: 0px; padding: 0.223em 0px 0.278em; white-space: pre;">x<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px; clip: rect(1px, 1px, 1px, 1px); display: block; height: 1px; left: 0px; margin: 0px; overflow: hidden; padding: 1px 0px 0px; position: absolute; top: 0px; user-select: none; width: 1px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><mi>�</mi></mstyle></math> là số nguyên dương <mstyle displaystyle="true"><mo>&#x21D2;</mo><mi>x</mi><mo>&#x2208;</mo><mo>&#xD8;</mo></mstyle></math>" id="MathJax-Element-17-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0">⇒<span class="mjx-char MJXc-TeX-math-I" face="MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw" style="box-sizing: content-box; display: block; margin: 0px; padding: 0.223em 0px 0.278em; white-space: pre;">x∈<span class="mjx-charbox MJXc-TeX-unknown-R" style="box-sizing: content-box; display: inline-block; font-family: STIXGeneral, "Cambria Math", "Arial Unicode MS", serif; margin: 0px; padding: 0px 0px 0.267em; width: 0.653em;">Ø<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px; clip: rect(1px, 1px, 1px, 1px); display: block; height: 1px; left: 0px; margin: 0px; overflow: hidden; padding: 1px 0px 0px; position: absolute; top: 0px; user-select: none; width: 1px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><mo>⇒</mo><mi>�</mi><mo>∈</mo><mo>Ø</mo></mstyle></math> Vậy không có giá trị nào của <mstyle displaystyle="true"><mi>x</mi></mstyle></math>" id="MathJax-Element-18-Frame" role="presentation" style="background-color: #f1f4f8; border: 0px; direction: ltr; display: inline-block; float: none; font-size: 18.15px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap;" tabindex="0"><span class="mjx-char MJXc-TeX-math-I" face="MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw" style="box-sizing: content-box; display: block; margin: 0px; padding: 0.223em 0px 0.278em; white-space: pre;">x<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px; clip: rect(1px, 1px, 1px, 1px); display: block; height: 1px; left: 0px; margin: 0px; overflow: hidden; padding: 1px 0px 0px; position: absolute; top: 0px; user-select: none; width: 1px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><mi>�</mi></mstyle></math>. <a style="background-color: #f1f4f8; color: #385898; cursor: pointer; margin: 0px; padding: 0px; text-align: left; white-space: pre-wrap;">Rút gọn</a> </div> </div></div> <div> </div>Bài 54 : Tìm x, biết. 49.7x = 240  <div> <div> <input 1="" onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = ''; this.value = 'Ẩn'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'XEM'; }" style="font-size: 11px; margin: 0px; padding: 4px; width: 75px;" type="button" value="XEM" /> </div> <div> <div style="background: #; border: 1px solid rgb(79, 79, 79); display: none; padding: 4px;"> <mtable columnalign="left" rowspacing="4pt" columnspacing="1em"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><msup><mn>49.7</mn><mi>x</mi></msup></mrow><mo>=</mo><mn>2401</mn></mtd></mtr><mtr><mtd><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mrow class="MJX-TeXAtom-ORD"><msup><mn>7</mn><mi>x</mi></msup></mrow><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mo>=</mo><mn>2401</mn><mo>:</mo><mn>49</mn></mtd></mtr><mtr><mtd><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mrow class="MJX-TeXAtom-ORD"><msup><mn>7</mn><mi>x</mi></msup></mrow><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mo>=</mo><mn>49</mn></mtd></mtr><mtr><mtd><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mrow class="MJX-TeXAtom-ORD"><msup><mn>7</mn><mi>x</mi></msup></mrow><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mo>=</mo><mrow class="MJX-TeXAtom-ORD"><msup><mn>7</mn><mn>2</mn></msup></mrow></mtd></mtr><mtr><mtd><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mi>x</mi><mo>=</mo><mn>2.</mn></mtd></mtr></mtable></math>" id="MathJax-Element-6-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 17.85px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.395em; white-space: pre;">49.7<span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.283em; padding-top: 0.227em; white-space: pre;">x<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.059em; white-space: pre;">=<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.395em; white-space: pre;">2401<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.395em; white-space: pre;">7<span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.283em; padding-top: 0.227em; white-space: pre;">x<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.059em; white-space: pre;">=<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.395em; white-space: pre;">2401<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.171em; white-space: pre;">:<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.395em; white-space: pre;">49<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.395em; white-space: pre;">7<span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.283em; padding-top: 0.227em; white-space: pre;">x<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.059em; white-space: pre;">=<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.395em; white-space: pre;">49<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.395em; white-space: pre;">7<span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.283em; padding-top: 0.227em; white-space: pre;">x<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.059em; white-space: pre;">=<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.395em; white-space: pre;">7<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.395em; white-space: pre;">2<span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.283em; padding-top: 0.227em; white-space: pre;">x<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.059em; white-space: pre;">=<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.395em; white-space: pre;">2.<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mtable columnalign="left" columnspacing="1em" rowspacing="4pt"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><msup><mn>49.7</mn><mi>�</mi></msup></mrow><mo>=</mo><mn>2401</mn></mtd></mtr><mtr><mtd><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mrow class="MJX-TeXAtom-ORD"><msup><mn>7</mn><mi>�</mi></msup></mrow><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mo>=</mo><mn>2401</mn><mo>:</mo><mn>49</mn></mtd></mtr><mtr><mtd><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mrow class="MJX-TeXAtom-ORD"><msup><mn>7</mn><mi>�</mi></msup></mrow><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mo>=</mo><mn>49</mn></mtd></mtr><mtr><mtd><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mrow class="MJX-TeXAtom-ORD"><msup><mn>7</mn><mi>�</mi></msup></mrow><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mo>=</mo><mrow class="MJX-TeXAtom-ORD"><msup><mn>7</mn><mn>2</mn></msup></mrow></mtd></mtr><mtr><mtd><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mi>�</mi><mo>=</mo><mn>2.</mn></mtd></mtr></mtable></math>Vậy <mi>x</mi><mo>=</mo><mn>2.</mn></math>" id="MathJax-Element-7-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 17.85px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.283em; padding-top: 0.227em; white-space: pre;">x<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.059em; white-space: pre;">=<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.395em; white-space: pre;">2. </div> </div></div> <div> </div>Bài 55 : Tìm x, biết. 3x = 81  <div> <div> <input 1="" onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = ''; this.value = 'Ẩn'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'XEM'; }" style="font-size: 11px; margin: 0px; padding: 4px; width: 75px;" type="button" value="XEM" /> </div> <div> <div style="background: #; border: 1px solid rgb(79, 79, 79); display: none; padding: 4px;"> <msup><mn>3</mn><mi>x</mi></msup><mo>=</mo><mn>81</mn></math>" id="MathJax-Element-2-Frame" role="presentation" style="border: 0px; box-sizing: inherit; direction: ltr; display: inline-block; float: none; font-size: 18.08px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.39em; padding-top: 0.39em; white-space: pre;">3<span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 12.7826px; font-style: inherit; font-weight: inherit; padding-left: 0px; padding-right: 0.071em; vertical-align: 0.59em;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; font-style: inherit; font-weight: inherit; padding-bottom: 0.279em; padding-top: 0.224em; white-space: pre;">x<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.335em; padding-top: 0.058em; white-space: pre;">=<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.39em; padding-top: 0.39em; white-space: pre;">81<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: inherit; clip: rect(1px, 1px, 1px, 1px); display: block !important; font-style: inherit; font-weight: inherit; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mn>3</mn><mi>�</mi></msup><mo>=</mo><mn>81</mn></math><mo stretchy="false">&#x21D4;</mo></math>" id="MathJax-Element-3-Frame" role="presentation" style="border: 0px; box-sizing: inherit; direction: ltr; display: inline-block; float: none; font-size: 18.08px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.39em; padding-top: 0.224em; white-space: pre;">⇔<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: inherit; clip: rect(1px, 1px, 1px, 1px); display: block !important; font-style: inherit; font-weight: inherit; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mo stretchy="false">⇔</mo></math><msup><mn>3</mn><mi>x</mi></msup><mo>=</mo><msup><mn>3</mn><mn>4</mn></msup></math>" id="MathJax-Element-4-Frame" role="presentation" style="border: 0px; box-sizing: inherit; direction: ltr; display: inline-block; float: none; font-size: 18.08px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.39em; padding-top: 0.39em; white-space: pre;">3<span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 12.7826px; font-style: inherit; font-weight: inherit; padding-left: 0px; padding-right: 0.071em; vertical-align: 0.59em;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; font-style: inherit; font-weight: inherit; padding-bottom: 0.279em; padding-top: 0.224em; white-space: pre;">x<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.335em; padding-top: 0.058em; white-space: pre;">=<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.39em; padding-top: 0.39em; white-space: pre;">3<span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 12.7826px; font-style: inherit; font-weight: inherit; padding-left: 0px; padding-right: 0.071em; vertical-align: 0.59em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.335em; padding-top: 0.39em; white-space: pre;">4<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: inherit; clip: rect(1px, 1px, 1px, 1px); display: block !important; font-style: inherit; font-weight: inherit; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mn>3</mn><mi>�</mi></msup><mo>=</mo><msup><mn>3</mn><mn>4</mn></msup></math><mo stretchy="false">&#x21D2;</mo></math>" id="MathJax-Element-5-Frame" role="presentation" style="border: 0px; box-sizing: inherit; direction: ltr; display: inline-block; float: none; font-size: 18.08px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.39em; padding-top: 0.224em; white-space: pre;">⇒<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: inherit; clip: rect(1px, 1px, 1px, 1px); display: block !important; font-style: inherit; font-weight: inherit; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mo stretchy="false">⇒</mo></math><mi>x</mi><mo>=</mo><mn>4</mn></math>" id="MathJax-Element-6-Frame" role="presentation" style="border: 0px; box-sizing: inherit; direction: ltr; display: inline-block; float: none; font-size: 18.08px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; font-style: inherit; font-weight: inherit; padding-bottom: 0.279em; padding-top: 0.224em; white-space: pre;">x<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.335em; padding-top: 0.058em; white-space: pre;">=<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.335em; padding-top: 0.39em; white-space: pre;">4 </div> </div></div> <div> </div>Bài 56 : Tìm x, biết. 34.3x = 37 <div> <div> <input 1="" onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = ''; this.value = 'Ẩn'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'XEM'; }" style="font-size: 11px; margin: 0px; padding: 4px; width: 75px;" type="button" value="XEM" /> </div> <div> <div style="background: #; border: 1px solid rgb(79, 79, 79); display: none; padding: 4px;"> <mtable columnalign="left" rowspacing="4pt" columnspacing="1em"><mtr><mtd><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mrow class="MJX-TeXAtom-ORD"><msup><mn>3</mn><mn>4</mn></msup></mrow><mrow class="MJX-TeXAtom-ORD"><msup><mn>.3</mn><mi>n</mi></msup></mrow><mo>=</mo><mrow class="MJX-TeXAtom-ORD"><msup><mn>3</mn><mn>7</mn></msup></mrow><mspace width="thinmathspace" /><mspace width="thinmathspace" /></mtd></mtr><mtr><mtd><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mrow class="MJX-TeXAtom-ORD"><msup><mn>3</mn><mrow class="MJX-TeXAtom-ORD"><mn>4</mn><mo>+</mo><mi>n</mi></mrow></msup></mrow><mo>=</mo><mrow class="MJX-TeXAtom-ORD"><msup><mn>3</mn><mn>7</mn></msup></mrow></mtd></mtr><mtr><mtd><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mn>4</mn><mo>+</mo><mi>n</mi><mo>=</mo><mn>7</mn></mtd></mtr><mtr><mtd><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mi>n</mi><mo>=</mo><mn>3</mn></mtd></mtr></mtable></math>" id="MathJax-Element-6-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 17.85px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.395em; white-space: pre;">3<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.395em; white-space: pre;">4<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.395em; white-space: pre;">.3<span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.283em; padding-top: 0.227em; white-space: pre;">n<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.059em; white-space: pre;">=<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.395em; white-space: pre;">3<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.395em; white-space: pre;">7<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.395em; white-space: pre;">3<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.395em; white-space: pre;">4<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.451em; padding-top: 0.283em; white-space: pre;">+<span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.283em; padding-top: 0.227em; white-space: pre;">n<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.059em; white-space: pre;">=<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.395em; white-space: pre;">3<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.395em; white-space: pre;">7<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.395em; white-space: pre;">4<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.451em; padding-top: 0.283em; white-space: pre;">+<span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.283em; padding-top: 0.227em; white-space: pre;">n<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.059em; white-space: pre;">=<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.395em; white-space: pre;">7<span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.283em; padding-top: 0.227em; white-space: pre;">n<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.059em; white-space: pre;">=<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.395em; white-space: pre;">3<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mtable columnalign="left" columnspacing="1em" rowspacing="4pt"><mtr><mtd><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mrow class="MJX-TeXAtom-ORD"><msup><mn>3</mn><mn>4</mn></msup></mrow><mrow class="MJX-TeXAtom-ORD"><msup><mn>.3</mn><mi>�</mi></msup></mrow><mo>=</mo><mrow class="MJX-TeXAtom-ORD"><msup><mn>3</mn><mn>7</mn></msup></mrow><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace></mtd></mtr><mtr><mtd><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mrow class="MJX-TeXAtom-ORD"><msup><mn>3</mn><mrow class="MJX-TeXAtom-ORD"><mn>4</mn><mo>+</mo><mi>�</mi></mrow></msup></mrow><mo>=</mo><mrow class="MJX-TeXAtom-ORD"><msup><mn>3</mn><mn>7</mn></msup></mrow></mtd></mtr><mtr><mtd><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mn>4</mn><mo>+</mo><mi>�</mi><mo>=</mo><mn>7</mn></mtd></mtr><mtr><mtd><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mi>�</mi><mo>=</mo><mn>3</mn></mtd></mtr></mtable></math>Vậy <mi>n</mi><mo>=</mo><mn>3.</mn></math>" id="MathJax-Element-7-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 17.85px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.283em; padding-top: 0.227em; white-space: pre;">n<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.059em; white-space: pre;">=<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.339em; padding-top: 0.395em; white-space: pre;">3. </div> </div></div> <div> </div>Bài 57 : Tìm x, biết. 3x + 25 = 26.22 + 2.30 <div> <div> <input 1="" onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = ''; this.value = 'Ẩn'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'XEM'; }" style="font-size: 11px; margin: 0px; padding: 4px; width: 75px;" type="button" value="XEM" /> </div> <div> <div style="background: #; border: 1px solid rgb(79, 79, 79); display: none; padding: 4px;"> <msup><mn>3</mn><mi>x</mi></msup><mo>+</mo><mn>25</mn><mo>=</mo><msup><mn>26.2</mn><mn>2</mn></msup><mo>+</mo><msup><mn>2.3</mn><mn>0</mn></msup></math>" id="MathJax-Element-1-Frame" role="presentation" style="border: 0px; box-sizing: inherit; direction: ltr; display: inline-block; float: none; font-size: 18.08px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.39em; padding-top: 0.39em; white-space: pre;">3<span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 12.7826px; font-style: inherit; font-weight: inherit; padding-left: 0px; padding-right: 0.071em; vertical-align: 0.59em;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; font-style: inherit; font-weight: inherit; padding-bottom: 0.279em; padding-top: 0.224em; white-space: pre;">x<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.445em; padding-top: 0.279em; white-space: pre;">+<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.39em; padding-top: 0.39em; white-space: pre;">25<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.335em; padding-top: 0.058em; white-space: pre;">=<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.39em; padding-top: 0.39em; white-space: pre;">26.2<span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 12.7826px; font-style: inherit; font-weight: inherit; padding-left: 0px; padding-right: 0.071em; vertical-align: 0.591em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.335em; padding-top: 0.39em; white-space: pre;">2<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.445em; padding-top: 0.279em; white-space: pre;">+<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.39em; padding-top: 0.39em; white-space: pre;">2.3<span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 12.7826px; font-style: inherit; font-weight: inherit; padding-left: 0px; padding-right: 0.071em; vertical-align: 0.591em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.39em; padding-top: 0.39em; white-space: pre;">0<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: inherit; clip: rect(1px, 1px, 1px, 1px); display: block !important; font-style: inherit; font-weight: inherit; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mn>3</mn><mi>�</mi></msup><mo>+</mo><mn>25</mn><mo>=</mo><msup><mn>26.2</mn><mn>2</mn></msup><mo>+</mo><msup><mn>2.3</mn><mn>0</mn></msup></math><msup><mn>3</mn><mi>x</mi></msup><mo>+</mo><mn>25</mn><mo>=</mo><mn>104</mn><mo>+</mo><mn>2</mn></math>" id="MathJax-Element-2-Frame" role="presentation" style="border: 0px; box-sizing: inherit; direction: ltr; display: inline-block; float: none; font-size: 18.08px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.39em; padding-top: 0.39em; white-space: pre;">3<span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 12.7826px; font-style: inherit; font-weight: inherit; padding-left: 0px; padding-right: 0.071em; vertical-align: 0.59em;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; font-style: inherit; font-weight: inherit; padding-bottom: 0.279em; padding-top: 0.224em; white-space: pre;">x<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.445em; padding-top: 0.279em; white-space: pre;">+<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.39em; padding-top: 0.39em; white-space: pre;">25<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.335em; padding-top: 0.058em; white-space: pre;">=<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.39em; padding-top: 0.39em; white-space: pre;">104<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.445em; padding-top: 0.279em; white-space: pre;">+<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.335em; padding-top: 0.39em; white-space: pre;">2<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: inherit; clip: rect(1px, 1px, 1px, 1px); display: block !important; font-style: inherit; font-weight: inherit; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mn>3</mn><mi>�</mi></msup><mo>+</mo><mn>25</mn><mo>=</mo><mn>104</mn><mo>+</mo><mn>2</mn></math><msup><mn>3</mn><mi>x</mi></msup><mo>+</mo><mn>25</mn><mo>=</mo><mn>106</mn></math>" id="MathJax-Element-3-Frame" role="presentation" style="border: 0px; box-sizing: inherit; direction: ltr; display: inline-block; float: none; font-size: 18.08px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.39em; padding-top: 0.39em; white-space: pre;">3<span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 12.7826px; font-style: inherit; font-weight: inherit; padding-left: 0px; padding-right: 0.071em; vertical-align: 0.59em;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; font-style: inherit; font-weight: inherit; padding-bottom: 0.279em; padding-top: 0.224em; white-space: pre;">x<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.445em; padding-top: 0.279em; white-space: pre;">+<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.39em; padding-top: 0.39em; white-space: pre;">25<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.335em; padding-top: 0.058em; white-space: pre;">=<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.39em; padding-top: 0.39em; white-space: pre;">106<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: inherit; clip: rect(1px, 1px, 1px, 1px); display: block !important; font-style: inherit; font-weight: inherit; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mn>3</mn><mi>�</mi></msup><mo>+</mo><mn>25</mn><mo>=</mo><mn>106</mn></math><msup><mn>3</mn><mi>x</mi></msup><mo>=</mo><mn>81</mn><mo>=</mo><msup><mn>3</mn><mn>4</mn></msup></math>" id="MathJax-Element-4-Frame" role="presentation" style="border: 0px; box-sizing: inherit; direction: ltr; display: inline-block; float: none; font-size: 18.08px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.39em; padding-top: 0.39em; white-space: pre;">3<span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 12.7826px; font-style: inherit; font-weight: inherit; padding-left: 0px; padding-right: 0.071em; vertical-align: 0.59em;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; font-style: inherit; font-weight: inherit; padding-bottom: 0.279em; padding-top: 0.224em; white-space: pre;">x<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.335em; padding-top: 0.058em; white-space: pre;">=<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.39em; padding-top: 0.39em; white-space: pre;">81<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.335em; padding-top: 0.058em; white-space: pre;">=<span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.39em; padding-top: 0.39em; white-space: pre;">3<span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 12.7826px; font-style: inherit; font-weight: inherit; padding-left: 0px; padding-right: 0.071em; vertical-align: 0.59em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; font-style: inherit; font-weight: inherit; padding-bottom: 0.335em; padding-top: 0.39em; white-space: pre;">4<span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: inherit; clip: rect(1px, 1px, 1px, 1px); display: block !important; font-style: inherit; font-weight: inherit; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mn>3</mn><mi>�</mi></msup><mo>=</mo><mn>81</mn><mo>=</mo><msup><mn>3</mn><mn>4</mn></msup></math>          Vậy x=4<mtable columnalign="left" rowspacing="4pt" columnspacing="1em"><mtr><mtd><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mrow class="MJX-TeXAtom-ORD"><msup><mn>3</mn><mn>4</mn></msup></mrow><mrow class="MJX-TeXAtom-ORD"><msup><mn>.3</mn><mi>n</mi></msup></mrow><mo>=</mo><mrow class="MJX-TeXAtom-ORD"><msup><mn>3</mn><mn>7</mn></msup></mrow><mspace width="thinmathspace" /><mspace width="thinmathspace" /></mtd></mtr><mtr><mtd><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mrow class="MJX-TeXAtom-ORD"><msup><mn>3</mn><mrow class="MJX-TeXAtom-ORD"><mn>4</mn><mo>+</mo><mi>n</mi></mrow></msup></mrow><mo>=</mo><mrow class="MJX-TeXAtom-ORD"><msup><mn>3</mn><mn>7</mn></msup></mrow></mtd></mtr><mtr><mtd><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mn>4</mn><mo>+</mo><mi>n</mi><mo>=</mo><mn>7</mn></mtd></mtr><mtr><mtd><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mi>n</mi><mo>=</mo><mn>3</mn></mtd></mtr></mtable></math>" id="MathJax-Element-6-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 17.85px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"> </div> </div></div> <div> </div>Bài 58 : So sánh 26 và 82 <div> <div> <input 1="" onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = ''; this.value = 'Ẩn'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'XEM'; }" style="font-size: 11px; margin: 0px; padding: 4px; width: 75px;" type="button" value="XEM" /> </div> <div> <div style="background: #; border: 1px solid rgb(79, 79, 79); display: none; padding: 4px;"> 26 và 8226 = 64 82 = 64<msup><mn>3</mn><mi>x</mi></msup><mo>+</mo><mn>25</mn><mo>=</mo><msup><mn>26.2</mn><mn>2</mn></msup><mo>+</mo><msup><mn>2.3</mn><mn>0</mn></msup></math>" id="MathJax-Element-1-Frame" role="presentation" style="border: 0px; box-sizing: inherit; direction: ltr; display: inline-block; float: none; font-size: 18.08px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span class="mjx-char MJXc-TeX-main-R" face="MJXc-TeX-main-R, MJXc-TeX-main-Rw" style="box-sizing: content-box; display: block; font-style: inherit; font-weight: inherit; padding-bottom: 0.39em; padding-top: 0.39em; white-space: pre;">=> 64 = 64 nên 26 = 82 </div> </div></div> <div> </div>Bài 59 : So sánh 53 và 35 <div> <div> <input 1="" onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = ''; this.value = 'Ẩn'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'XEM'; }" style="font-size: 11px; margin: 0px; padding: 4px; width: 75px;" type="button" value="XEM" /> </div> <div> <div style="background: #; border: 1px solid rgb(79, 79, 79); display: none; padding: 4px;"> 53 = 125 và 35 = 243 nên 53< 35 </div> </div></div> <div> </div>Bài 60 : So sánh 32 và 23 <div> <div> <input 1="" onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = ''; this.value = 'Ẩn'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'XEM'; }" style="font-size: 11px; margin: 0px; padding: 4px; width: 75px;" type="button" value="XEM" /> </div> <div> <div style="background: #; border: 1px solid rgb(79, 79, 79); display: none; padding: 4px;"> 32 = 9 và 23 = 8 nên 32> 23 </div> </div></div>

Bài tập Lũy thừa với số mũ tự nhiên (6)

Bài 51 : Tìm x, biết. 2x – 2 6 = 6 2x- 2 6 2 6 = 6 ⇔2x-64=6 ⇔2x=6+64 ⇔ 2x=70 ⇔ x= 35 Bài 52 : Tìm x, biết. 64.4 x = 45 64 . 64 . 4 ...

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