a)
\(x-25\%.x=\dfrac{1}{2}\)
\(x-\dfrac{25}{100}x=\dfrac{1}{2}\)
\(x-\dfrac{1}{4}x=\dfrac{1}{2}\)
\(x\left(1-\dfrac{1}{4}\right)=\dfrac{1}{2}\)
\(x.\dfrac{3}{4}=\dfrac{1}{2}\)
\(x=\dfrac{1}{2}:\dfrac{3}{4}\)
\(x=\dfrac{2}{3}\)
Vậy \(x=\dfrac{2}{3}\) là giá trị cần tìm
b)
\(\left|x-2\right|5=0\)
\(\left|x-2\right|=0:5\)
\(\left|x-2\right|=0\)
\(\Rightarrow x-2=0\)
\(x=0+2\)
\(x=2\)
Vậy \(x=2\) là giá trị cần tìm
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