| ( -2/3 ) . x + 3/8 | . ( -8/5 ) = - 8/15 tìm x

`|(-2/3) . x + 3/8| . (-8)/5 = -8/15`

`|-2/3 . x + 3/8| = -8/15 : (-8)/5`

`|-2/3 . x + 3/8| = 1/3`

`=>+)` trường hợp `1` :

`-2/3 . x + 3/8 = 1/3`

`-2/3 . X = 1/3 - 3/8`

`-2/3x =-1/24`

`x = -1/24 : (-2)/3`

`x= 1/16`

`+)` trường hợp `2` :

`-2/3 . x+ 3/8 = -1/3`

`-2/3x = -1/3 - 3/8`

`-2/3x =-17/24`

`x = -17/24 : (-2)/3`

`x= 17/16`

Vậy `x \in { 1/16 ; 17/16}`

`#caty09`