Bài 2: (1,5 điểm) Tìm x, biết: a) $x-\frac{-1}{5}$ $=1\frac{1}{2}$  b) $-\frac{1}{2}+ $ ($x-\frac{5}{11}$) $= \frac{-3}{4}$  c)  $\frac{3}{4}+$ ($\frac{2}{5}-x$) $= \frac{1}{4}$ 

Bài `2:`

`a) x- (-1)/5 = 1 1/2`

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

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

`=> x=15/10-2/10`

`=> x=13/10`

Vậy `x=13/10`

`b) -1/2 + (x-5/11)=-3/4`

`=> x-5/11 = -3/4 - (-1/2)`

`=> x-5/11 = -3/4 + 2/4`

`=> x-5/11=-1/4`

`=> x=-1/4+5/11`

`=> x=-11/44 + 20/44`

`=> x=9/44`

Vậy `x=9/44`

`c)` `3/4 + (2/5 - x)=1/4`

`=> 2/5 - x = 1/4 - 3/4`

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

`=> x=2/5 - (-1/2)`

`=> x=4/10 + 5/10`

`=> x=9/10`

Vậy `x=9/10`