Giúp em với mọi người

`a)`

`3/5 : (1/4 . 7/5)`

`= 3/5 : 7/20`

`= 12/7`

`b)`

`(-3)/8 + 7/4 - 1/12`

`= 11/8 - 1/12`

`= 31/24`

`c)`

`(1/2 : 23/24) . 3/10`

`= 12/23 . 3/10`

`= 18/115`

`d)`

`(-1)/2 + (-1)/3 - (-5)/4`

`= (-5)/6 - (-5)/4`

`= 5/12`

`e)`

`6/5 : (1/3 : 1/5 . 8/15)`

`= 6/5 : (2 . 8/15)`

`= 6/5 : 16/15`

`= 9/8`

`f)`

`4 - 1/3 + (-7)/6`

`= 11/3 + (-7)/6`

`= 5/2`

`g)`

`10/11 + 4/11 : 4 - 1/8`

`= 10/11 + 1/11 - 1/8`

`= 1 - 1/8`

`= 7/8`

`h)`

`1/7 : 5/14 - 3/2(1/6 - 7/12)`

`= 1/7 : 5/14 - 3/2 . (-5)/12`

`= 2/5 - (-5)/8`

`= 41/40`

`l)`

`1/5 : 1/10 - 1/3(6/5 - 9/4)`

`= 1/5 : 1/10 - 1/3 . (-21)/20`

`= 2 - (-7)/20`

`= 47/20`