Đáp án:

`d)(-3)/11 - (x - 2/5) = (-14)/22`

`x - 2/5 = (-3)/11 - (-14)/22`

`x - 2/5 = (-6)/22 + 14/22`

`x - 2/5 = 4/11`

`x = 4/11 + 2/5`

`x = 42/55`

Vậy `x = 42/55`

`g)7/2 - [3/2 - (x + 7/2)] = (-9)/11`

`3/2 - (x + 7/2) = 7/2 - (-9)/11`

`3/2 - (x + 7/2) = 95/22`

`x + 7/2 = 3/2 - 95/22`

`x + 7/2 = 33/22 - 95/22`

`x + 7/2= (-31)/11`

`x = (-31)/11 - 7/2`

`x = (-139)/22`

Vậy `x = (-139)/22`

`h)(12/7 : x - 0,5) (2/5x - 1 1/2) = 0`

`TH1:`

`12/7 : x - 0,5 = 0`

`12/7 : x = 0 + 0,5`

`12/7 : x= 0,5`

`x = 0,5 : 12/7`

`x = 0,5 xx 7/12`

`x = 7/24`

`TH2:`

`2/5x - 1 1/2 = 0`

`2/5x = 0 + 3/2`

`2/5x = 3/2`

`x = 3/2 : 2/5`

`x = 3/2 xx 5/2`

`x = 15/4`

Vậy `x in {7/24;15/4}`