Question

1.Tính bằng cách thuận tiện

3/4 x 7/6 - 7/4 x 1/6 + 2/3 x 7/4

Giúp mik nhanh đc ko ạ 

Answer 1

`3/4 \times 7/6 - 7/4 \times 1/6 + 2/3 \times 7/4`

`=7/6 \times 3/4 - 7/6 \times 1/4 + 2/3 \times 7/4`

`=7/6 \times (3/4 - 1/4) + 2/3 \times 7/4`

`=7/6 \times 2/4 +2/3 \times 7/4`

`=7/4 \times 2/6 + 2/3 \times 7/4`

`=7/4 \times (1/3 + 2/3)`

`=7/4 \times 3/3`

`=7/4 \times 1`

`=7/4`