Giúp mình làm bài 2 vs ạ

Đáp án + Giải thích các bước giải:

`a.`

`(x-1/2) . 12/25 =4/5`

`=>x-1/2 = 4/5 : 12/25`

`=>x-1/2=4/5 . 25/12`

`=>x-1/2=5/3`

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

`=>x=10/6+3/6`

`=>x=13/6`

Vậy `x=13/6`

`b.`

`(1/3-x)^2=25/9`

`=>`\(\left[ \begin{array}{l}\dfrac{1}{3}-x=\dfrac{5}{3}\\\dfrac{1}{3}-x=\dfrac{-5}{3}\end{array} \right.\) 

`=>`\(\left[ \begin{array}{l}x=\dfrac{1}{3}-\dfrac{5}{3}\\x=\dfrac{1}{3}+\dfrac{ 5}{3}\end{array} \right.\) 

`=>`\(\left[ \begin{array}{l}x=\dfrac{-4}{3}\\x=2\end{array} \right.\)

Vậy `x=(-4)/3` hoặc `x=2`

`c.`

`2 1/4x-25%x=1`

`=>9/4x-1/4x=1`

`=>x(9/4-1/4)=1`

`=>x . 8/4=1`

`=>x . 2=1`

`=>x=1/2`

Vậy `x=1/2`