3/10 x 4/9 6/5 : 3/7 3/4 x 2/5 5/8 : 1/2 4 x 3/8 3 : 1/2 1/2 : 3

Đáp án:

Giải thích các bước giải:

`1, 3/10 × 4/9`

`= (3×4)/(10 × 9)`

`= 12/90`

`2, 6/5 : 3/7`

`= 6/5 × 7/3`

`= 42/15`

`3, 3/4 x 2/5`

`= (3 × 2)/(5 × 4)`

`= 6/20`

`4, 5/8 : 1/2`

`= 5/8 × 1/2`

`= 5/16`

`5, 4 x 3/8`

`= (4 × 3)/8`

`= 12/8`

`6, 3 : 1/2`

`= 3 × 2`

`= 6`

`7, 1/2 : 3`

`= 1/2 × 1/3`

`= 1/6`