Bài 2:
a) \(x+112=128\)
\(\Rightarrow x=128-112\)
\(\Rightarrow x=16\)
b) \(\left(8x-16\right)\left(x-4\right)=0\)
\(\Rightarrow8\left(x-2\right)\left(x-4\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=2\\x=4\end{matrix}\right.\)
c) \(2x-135=3^7:3^4\)
\(\Rightarrow2x-135=27\)
\(\Rightarrow2x=162\Rightarrow x=81\)
d) \(3^x-64=17\)
\(\Rightarrow3^x=81\)
\(\Rightarrow3^x=3^4\Rightarrow x=4\)
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