Câu 5: (0,5 điểm) Tìm x biết: |2x - 1| + |1 - 2x| = 8

`|2x-1|+|1-2x|=8`

`=>` `|2x-1|+|-(2x-1)|=8`

`=>` `|2x-1|+|2x-1|=8`

`=>` `2|2x-1|=8`

`=>` `|2x-1|=8:2`

`=>` `|2x-1|=4`

`=>` `[(2x-1=4),(2x-1=-4):}`

`=>` `[(2x=4+1),(2x=(-4)+1):}`

`=>` `[(2x=5),(2x=-3):}`

`=>` $\left[\begin{matrix} x=\dfrac{5}{2}\\ x=-\dfrac{3}{2}\end{matrix}\right.$

Vậy `x \in {5/2 ; -3/2}`

`@embesiumap`