`|3/5-1/2x|>2/5`

Đáp án:

`\qquad |3/5-1/2x|>2/5`

`<=>`\(\left[ \begin{array}{l}\dfrac{3}{5}-\dfrac{1}{2}x>\dfrac{2}{5}\\\dfrac{3}{5}-\dfrac{1}{2}x<-\dfrac{2}{5}\end{array} \right.\) 

`<=>`\(\left[ \begin{array}{l}\dfrac{1}{2}x<\dfrac{1}{5}\\\dfrac{1}{2}x>1\end{array} \right.\) 

`<=>`\(\left[ \begin{array}{l}x<\dfrac{2}{5}\\x>2\end{array} \right.\) 

Vậy `x<2/5` hoặc `x>2` thì `|3/5-1/2x|>2/5`

Giải thích các bước giải:

`|a|>b \text{ (b>0)}<=>`\(\left[ \begin{array}{l}a>b\\a<-b\end{array} \right.\)