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12-(2-x)2=3
(2-x)2=12-3
(2-x)2=9
(2-x)2=32
2-x=3
x=2-3
x=-1
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a) Ta có: x4-1 = 27
Mà 33 = 27
x3 = 33
Vậy x = 3
b) Ta có: 3x-1 = 27
Mà 33 = 27
=> 3x-1 = 33
=> x - 1 = 3
=> x = 3+1=4
Vậy x = 4
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a) ( x-1)3 = 27
( x-1)3 = 33
=> x-1 = 3
x = 3+1
x = 4
b) 2x.3x = 4.9
2x.3x = 22 . 32
=> x = 2
Học tốt!!!!!!!!!
( x - 1 ) 3 = 27.........................
(x - 1 ) 3 = 33 ......................
x - 1 = 3 .............................
x = 4....................................
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Bài làm :
a) 32x+1 = 27
<=> 32x+1 = 33
<=> 2x+1=3
<=> 2x=2
<=> x=1
Vậy x=1
b) x50 = x
<=> x50 - x = 0
\(\Leftrightarrow x\left(x^{49}-1\right)=0\Leftrightarrow\orbr{\begin{cases}x=0\\x^{49}-1=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=0\\x^{49}=1\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=0\\x=1\end{cases}}\)
Vậy x=0 hoặc x=1
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\(1,x.34-x.10=240\)
\(\Rightarrow x.\left(34-10\right)=240\)
\(\Rightarrow x.24=240\)
\(\Rightarrow x=240:24=10\)
\(2,4^{x+1}=16\)
\(\Rightarrow4^{x+1}=4^2\)
\(\Rightarrow x+1=2\Rightarrow x=1\)
\(3,\left(x+1\right)^3=27=3^3\)
\(\Rightarrow x+1=3\Rightarrow x=2\)
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9^10=3^20 27^21=3^63
3^2x+1=3^63
2x+1=63
3^20=3^x+3 x=31
20=x+3
x=17
a. 910 = 3x+3
(32)10 = 3x+3
320=3x+3
x+3=20
x=20-3
x=17
b. 32x+1=2721
32x+1=(33)21
32x+1=363
2x+1=63
2x=63-1
2x=62
x=62:2
x=31
3x-1:3=27
=> 3x-1=27.3
=> 3x-1=81
=> 3x=81+1
=> 3x=82 ( đề có gì sai sai )