e, x: 2,2= (18,6 -12,3) :3 f, 3/8 - 1/6. x= 1/4 g, x/5 = 1/3 h, 1/2 -2/3 .x= 7/1

Đáp án `+` Giải thích các bước giải:

`e)x:2,2=(18,6-12,3):3`

`=>x:2,2=6,3:3`

`=>x:2,2=2.1`

`=>x=2,1xx2,2`

`=>x=4,62`

Vậy `x=4,62`

__

`f)3/8-1/6x=1/4`

`=>1/6x=3/8-1/4`

`=>1/6x=3/8-2/8`

`=>1/6x=1/8`

`=>x=1/8:1/6`

`=>x=1/8 . 6`

`=>x=6/8`

`=>x=3/4`

Vậy `x=3/4`

__

`g)x/5=1/3`

`=>3x=1.5`

`=>3x=5`

`=>x=5:3`

`=>x=5/3`

Vậy `x=5/3`

__

`h)1/2-2/3x=7/1`

`=>2/3x=1/2-7`

`=>2/3x=1/2-14/2`

`=>2/3x=-13/2`

`=>x=-13/2:2/3`

`=>x=-13/2 . 3/2`

`=>x=-39/4`

Vậy `x=-39/4`