Giải nhanh chóng hộ em vs an

`a . ` `x+|(-3)/5|=\sqrt{0,01}`

`<=>` `x+3/5=0,1`

`<=>` `x+3/5=1/10`

`<=>` `x=1/10-3/5`

`<=>` `x=-1/2`

` -------------------`

`b . ` `4/9:|x|=1/2-1/3`

`<=>` `4/9:|x|=1/6`

`<=>` `|x|=4/9:1/6`

`<=>` `|x|=8/3`

`<=>` $\left[\begin{matrix} x=\dfrac{8}{3}\\ x=-\dfrac{8}{3}\end{matrix}\right.$

Vậy `x \in {8/3 ; -8/3}`

` -------------------`

`c . ` `|2/5+x|*\sqrt{9/4}=|-0,5|`

`<=>` `|2/5+x|*3/2=1/2`

`<=>` `|2/5+x|=1/2:3/2`

`<=>` `|2/5+x|=1/3`

`<=>` $\left[\begin{matrix} \dfrac{2}{5}+x=\dfrac{1}{3}\\ \dfrac{2}{5}+x=-\dfrac{1}{3}\end{matrix}\right.$ $\\$

`<=>` $\left[\begin{matrix} x=\dfrac{1}{3}-\dfrac{2}{5}\\ x=-\dfrac{1}{3}-\dfrac{2}{5}\end{matrix}\right.$ $\\$

`<=>` $\left[\begin{matrix} x=-\dfrac{1}{15}\\ x=-\dfrac{11}{15}\end{matrix}\right.$

Vậy `x \in {-1/15 ; -11/15}`

`@bk`