Bài 2 (1,5 điểm) Tìm x a) $x- 1\frac{2}{5}$= $\frac{3}{4}$  b) $\frac{1}{2}x$- $\frac{4}{7}$= $1 \frac{3}{7}$  c) $\frac{2}{3}x$- $\frac{3}{2}$ $(x- \frac{1}{2})$ = $\frac{5}{12}$ 

`a)`

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

`=>x-7/5=3/4`

`=>x=3/4+7/5`

`=>x=43/20`

Vậy `x=43/20`

`b)1/2 x-4/7=1 3/7`

`=>1/2 x-4/7=10/7`

`=>1/2 x=10/7+4/7`

`=>1/2x=2`

`=>x=2.2`

`=>x=4`

Vậy `x=4`

`c)2/3 x -3/2(x-1/2)=5/12`

`=>2/3 x-(3/2 x-3/4)=5/12`

`=>2/3 x - 3/2 x +3/4=5/12`

`=> -5/6 x=5/12-3/4`

`=> -5/6x=-1/3`

`=>x=-1/3 . (-6)/5`

`=>x=2/5`

Vậy `x=2/5`