Giải hộ e ạ các ah chj ạ

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`1) (3/4 − 1/6) : 2/3`

`= 7/12 : 2/3`

`= 7/12 × 3/2`

`= 21/24`

`= 7/8`

`2) (4/9 − 7/11) : 4/9`

`= -19/99 : 4/9`

`= -19/99 × 9/4`

`= -171/396

`= -19/44`

`3) (21/8 − 3/4) : 3/16`

`= 15/8 : 3/16`

`= 15/8 × 16/3`

`= 240/24`

`= 10`

`4) 3/2 − (7/3 − 5/3) · 4`

`= 3/2 − 2/3 · 4`

`= 3/2 − 8/3`

`= 9/6 − 16/6`

`= -7/6`

`5) 17/8 : (27/8 + 11/2)`

`= 17/8 : 71/8`

`= 17/8 × 8/71`

`= 17/71`

`6) 3/(-4) : (12/(-5) − (-7)/10)`

`= -3/4 : (-17/10)`

`= -3/4 × -10/17`

`= 30/68`

`= 15/34`