Question

TTính [6 1/2-(x+1)]:-5/4=2/5

Answer 1

`[6 1/2-(x+1)]:-5/4=2/5`

`=> 13/2 -(x+1) = 2/5 xx (-5/4)`

`=>13/2 -(x+1) = -10/20`

`=> x+1=13/2 +1/2`

`=> x+1=14/2`

`=> x= 7-1`

`=>x=6`

Vậy `x=6`

Answer 2

Lời giải:

$6\frac{1}{2}-(x+1)=\frac{2}{5}.\frac{-5}{4}=\frac{-1}{2}$

$x+1=6\frac{1}{2}-\frac{-1}{2}=7$

$x=7-1=6$