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b: Ta có: \(2^{x+3}+2^x=144\)

\(\Leftrightarrow2^x\cdot9=144\)

\(\Leftrightarrow2^x=16\)

hay x=4

14 tháng 10 2021

a) (x ^ 54)^2 = x                                         

         x^108  = x

Để: x^108  = x 

=> x=0 hoặc x=1

22 tháng 9 2015

a) \(2^{4x}-3^{2x}=144-164:41\)

\(\Leftrightarrow16^x-9^x=144-4\)

\(\Leftrightarrow\) ......

bjan tự tính tiếp đc òi                 

24 tháng 6 2017

Ta có:

\(2^{x+3}+2^x=144\Rightarrow2^x.2^3+2^x=144\)

\(\Rightarrow2^x.\left(2^3+1\right)=144\Rightarrow2^x.9=144\)

\(\Rightarrow2^x=144:9\Rightarrow2^x=16\)

\(\Rightarrow2^x=2^4\Rightarrow x=4\)

24 tháng 6 2017

2x+3 + 2x = 144

2x( 23 +1) = 144

2x . 9 = 144

2x = 16

2x = 2=> x=4

14 tháng 10 2018

Bo may la binh day k di hieu ashdbfgbgygygggydfsghuyfhdguuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu3

18 tháng 11 2019

a) 25+x=0

   x=0-25

  x=-25

b)\(2^x:2^{19}=2^{25}\)

\(2^x=2^{25}.2^{19}\)

\(2^x=2^{44}\)

=>x=44

c)\(5^x.5^{18}=5^{54}\)

\(5^x=5^{54}:5^{18}\)

\(5^x=5^{36}\)

=>x=36

18 tháng 11 2019

TL :

a) \(25+x=0\)

\(x=0-25\)

\(x=-25\)

b) \(2^x:2^{19}=2^{35}\)

\(2^x=2^{25}.2^{19}\)

\(2^x=2^{44}\)

\(\Rightarrow x=44\)

c) \(5^x.5^{18}=5^{54}\)

\(5^x=5^{54}:5^{18}\)

\(5^x=5^{36}\)

\(\Rightarrow x=36\)

Học tốt

6 tháng 7 2017

\(3^{x+2}=243\) 

\(3^{x+2}=3^5\)   

=>  x + 2 = 5 

=>  x = 3 

\(2^{x+3}+2^x=144\)  

\(2^x.8+2^x=144\)  

\(2^x.\left(8+1\right)=144\)  

\(2^x.9=144\)  

\(2^x=16\)  

=>  x = 4  

\(3^5+2=243\)  cái này bạn sai nhé. không ra đâu

\(2^4+3+2^7=147\)cái này bạn sai nhé. không ra đâu