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( x - 2 )6 = ( x - 2 )8 => x - 2 = 1 ( vì 0 không thể là cơ số )
=> x = 1 + 2
=> x = 3
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\(2^x+2^{x+1}+2^{x+2}+...+2^{x+2015}=2^{2019}-8\)
\(\Leftrightarrow2^x\left(1+2+2^2+...+2^{2015}\right)=2^{2019}-2^3\)
\(\Leftrightarrow2^x\left(2^{2016}-1\right)=2^3\left(2^{2016}-1\right)\)
\(\Leftrightarrow2^x=2^3\)
\(\Leftrightarrow x=3\)
Vậy x = 3
2 x + 2x+1+ 2 x+2+.......+ 2x+2015=22019-8
=2x.( 1+2+22+23+.....+ 2 2015)=22019- 23
đặt A= 1+2+22+...+22015
=>2A=2+22+23+..+22016
=>2A -A = ( 2+ 22+23+......+22016)-(1+2+22+........+22015)=A=22016-1
\(\Rightarrow\)2x.(22016-1)=23.(22016-1)
=>x=3
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x = 2^8/2^4 + 3^5 = 256/16 + 243 = 16 + 243 = 259
k mk nha
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a)(2x-2)3=8
(2x-2)3=(\(\pm\)2)3
Vậy 2x-2=2 hoặc 2x-2=(-2)
2x =2+2=4 2x =2+(-2)=0
x =4:2=2 x 0:2=0
Câu b mik ko biết sorry nha!
Hok tốt!
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a, ( x - 7 ) . 3 = 92 : 3
( x - 7 ) . 3 = 81 : 3
( x - 7 ) . 3 = 27
x - 7 = 27 : 3
x - 7 = 9
x = 9 + 7
x = 16
b, ( 5 + x ) . 2 = 82 : 4
( 5 + x ) . 2 = 64 : 4
( 5 + x ) . 2 = 16
5 + x = 16 : 2
5 + x = 8
x = 8 - 5
x = 3
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x3-23=25-(33+22)
x3-23=32-31
x3-23=1
x3=8+1=9
x3=9
khai căn= xong
2x-2=x
2x=x+2
2x-x=x+2-x
x=2
đúng thì tick cho mình nhé