Question

tìm x: 

-\(\left|x+\dfrac{2}{5}\right|\)=0

Answer 1

`-|x+2/5|=0`

`|x+2/5|=0`

`x+2/5=0`

`x=-2/5`

Vậy `x=-2/5`

Answer 2

Ta có: \(-\left|x+\dfrac{2}{5}\right|=0\\ TH1:-\left(x+\dfrac{2}{5}\right)=0\\ =>-x=\dfrac{2}{5}=>x=\dfrac{-2}{5}\\ TH2:-\left(-x-\dfrac{2}{5}\right)=0=>x+\dfrac{2}{5}=0=>x=\dfrac{-2}{5}\)

Vậy x=\(\dfrac{-2}{5}\)