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a ) x + 2 1 3 = 2 5 6 ⇒ x = 2 5 6 − 2 1 3 = 1 2 .
b ) x + 8 2 3 = 3 1 3 ⇒ x = 3 1 3 − 8 2 3 = 10 3 − 26 3 = − 16 3 .
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\(4^{x+3}=256\)
\(4^{x+3}=4^4\)
\(\Rightarrow x+3=4\)
\(\Rightarrow x=4-3\)
\(\Rightarrow x=1\)
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8 . 2x-1 = 256
2x-1 = 256 : 8
2x-1 = 32
2x-1 = 25
=> x - 1 = 5
x = 5 + 1
x = 6
Ta có: 8.2x-1=256
=> 2x-1=256: 8
=> 2x-1=32
mà 25 = 32 . Nên x= 5+1 = 6
Vậy x = 6
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23\(x+1\).23\(x+1\) = 256
2\(3x+1+3x+1\) = 28
26\(x+2\) = 28
6\(x\) + 2 = 8
6\(x\) = 8 - 2
6\(x\) = 6
\(x\) = 6: 6
\(x\) = 1
4^x=4^4 hoac 4^x=-4^4
=>x=4 hoac=-4 tick nha Nguyễn Ngọc Lâm Tuyền
x= 4 nha bạn.