`a) (2x-1)^3=-125`
`->` `(2x-1)^3 = (-5)^3 = -125`
`->` `(2x-1)^3 = (-5)^3 `
`->` `2x-1=-5`
`2x` `=-5+1`
`2x` `=-4`
`x` `=-4:2`
`x` `=-2`
`b) |x+1 1/2|-1/2=0`
`|x+1 1/2|` `=0+1/2`
`|x+ 3/2|` `=1/2`
`=>` $\left[\begin{matrix} x+\dfrac{3}{2}=\dfrac{1}{2}\\ x+\dfrac{3}{2}=- \dfrac{1}{2}\end{matrix}\right.$
`=>` $\left[\begin{matrix} x=\dfrac{1}{2}-\dfrac{3}{2}\\ x=- \dfrac{1}{2}-\dfrac{3}{2}\end{matrix}\right.$
`=>` $\left[\begin{matrix} x=-1\\ x=- 2\end{matrix}\right.$
Vậy `x=-1` hoặc `x=-2`
`c) 3|x|-4 1/2=10`
`3|x|-9/2=10`
`3|x|` `=10+9/2`
`3|x|` `=29/2`
`|x|` `=29/2:3`
`|x|` `=29/6`
`=>` $\left[\begin{matrix} x=\dfrac{29}{6}\\ x=-\dfrac{29}{6}\end{matrix}\right.$
Vậy `x=29/6` hoặc `x=-29/6`
