a)x:3/4+1/4=2/3 b)-2/3-1/3.(2x-5)=3/2

Answer`:`

`a)`

 `x:3/4+1/4=2/3`

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

`=>x:3/4=5/12`

`=>    x=5/12xx3/4`

`=>    x=5/16`

Vậy `x=5/16`

`b)`

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

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

`=>1/3.(2x-5)=-13/6`

`=>2x-5=-13/6:1/3`

`=>2x-5=-13/2`

`=>    2x=-13/2+5`

`=>    2x=-3/2`

`=>     x=-3/2:2`

`=>     x=-3/4`

Vậy `x=-3/4`

`#Boy`

`a)`

`x : 3/4 + 1/4 = 2/3`

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

`=> x : 3/4 = 5/12`

`=> x = 5/12. 3/4`

`=> x = 5/16`

 $Vậy$ `x = 5/16`

`b)`

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

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

`=> 1/3. ( 2x - 5 ) = -13/6`

`=> 2x - 5 = ( -13/6 ) : 1/3`

`=> 2x - 5 = -13/2`

`=> 2x = -13/2 + 5`

`=> 2x = -3/2`

`=> x = ( -3/2 ) : 2`

`=> x = -3/4`

 $Vậy$ `x = -3/4`