c,1.25/0.1x=1.35/0.2 d, (3x-2):7/2=4/21:1/12

`c) (1, 25)/(0, 1x) = (1, 35)/(0, 2)`

`=> 1,25 . 0,2 = 0,1x . 1,35`

`=> 0,1x . 1,35 = 1,25 . 0,2`

`=> 0,1x . 1,35 = 0,25`

`=> 0,1x = 0,25 : 1,35`

`=> 0,1x = 5/27`

`=> x = 5/27 : 0,1`

`=> x = 50/27`

Vậy `x = 50/27`

`---------------`

`d) (3x-2) : 7/2 = 4/21 : 1/12`

`=> (3x-2) : 7/2 = 4/21 * 12`

`=> (3x-2) : 7/2 = 16/7`

`=> 3x - 2 = 16/7 * 7/2`

`=> 3x - 2 = 8`

`=> 3x = 10`

`=> x = 10/3`

Vậy `x = 10/3`

$# Green$