Question

a -5/12 +0,75   c15/12 +5/13-[3/12+18/13]

 

Answer 1

`(-5)/12 + 0,75`

`=(-5)/12 + 3/4`

`=(-5)/12 + 9/12`

`=(-5+9)/12`

`=4/12`

`=1/3`

___________________________

`15/12 + 5/13 ( 3/12 + 18/13)`

`=15/12 + 5/13 + 3/12 - 18/13`

`=(15/12 - 3/12) + (5/13 - 18/13)`

`=12/12+ (-13/13)`

`=1 + (-1)`

`=0`