a, 2/3 . x = 2/7

b, x. 3/5 = 2/5

c, x : 8/13 = 13/7

d, 3/2 : x 7/4

Đáp án + Giải thích các bước giải:

`a) 2/3 . x = 2/7`

`=> x = 2/7 : 2/3`

`=> x = 2/7 . 3/2`

`=> x = 3/7`

Vậy `x=3/7`

`b) x . 3/5 = 2/5`

`=> x = 2/5 : 3/5`

`=> x = 2/5 . 5/3`

`=> x = 2/3`

Vậy `x=2/3`

`c) x : 8/13 = 13/7`

`=> x = 13/7 . 8/13`

`=> x = 8/7`

Vậy `x=8/7`

`d) 3/2 : x = 7/4`

`=> x = 3/2 : 7/4`

`=> x = 3/2 . 4/7`

`=> x = 6/7`

Vậy ` x=6/7`