Đáp án:
Giải thích các bước giải:
`a) 2.|1/2x-3/4|-7=3`
`2.|x/2-3/4|=10`
`|{2x}/4-3/4|=5`
`|{2x-3}/4|=5`
$⇒\left[\begin{array}{l}
\frac{2x-3}{4}=5 \\
\frac{2x-3}{4}=-5
\end{array}\right.$
$⇒\left[\begin{array}{l}
2x-3=20 \\
2x-3=-20
\end{array}\right.$
$⇒\left[\begin{array}{l}
2x=23 \\
2x=-17
\end{array}\right.$
$⇒\left[\begin{array}{l}
x=\frac{23}{2} \\
x=\frac{-17}{2}
\end{array}\right.$
`b) 7/{12}+3x=1/3`
`3x={-1}/4`
`x={-1}/{12}`
