Làm hộ bài 2!!!!!!!!

Đáp án:

Bài 2 : 

`a)` `10/7x=25/-14`

`=>x=25/-14:10/7`

`=>x=-5/4` 

`to` Vậy `x=-5/4` 

`b)` `-5/4-x=9/13+(-3)/2`

`=>-5/4-x=-21/26`

`=>x=-5/4+21/26`

`=>x=-23/52`

`to` Vậy `x=-23/52` 

`c)` `7-(1/9-x).3/5=3/2`

`=>(1/9-x).3/5=7-3/2`

`=>(1/9-x).3/5=11/2`

`=>1/9-x=11/2:3/5`

`=>1/9-x=55/6`

`=>x=1/9-55/6`

`=>x=-163/18`

`to` Vậy `x=-163/18`

`to` Vậy `x=81/2` 

`d)` `5/4-x=0,6`

`=>x=5/4-0,6`

`=>x=13/20` 

`to` Vậy `x=13/20` 

`f)` `(x+2,5): 2 1/4 = -5/6`

`=>(x+2,5):9/4=-5/6` 

`=>x+2,5=-5/6.``9/4`

`=>x+2,5=-15/8`

`=>x=-15/8-2,5`

`=>x=-5/8`

`to` Vậy `x=-5/8`