Help meeeeeeee !! Aaaaaaa

`a) 1/12 + 1/4 + 2/3 + 1`

` = 1/12 + 3/12 + 8/12 - 12/12`

`= (1+3+8-12)/12`

`= 0/12`

`=0`

`b) 13/35 + 8/24 + 22/35 - 4/3`

`= 13/35 + 1/3 + 22/35 - 4/3`

`= ( 13/35 + 22/35 ) + ( 1/3 - 4/3 )`

`= 35/35 + ( -3/3)`

`= 1-1`

`=0`

`c) -1/6 + 5/13 + -11/12 + 5/(-13)`

`= ( -1/6 + -11/12 ) + ( 5/13 + 5/(-13))`

`= ( -2/12 + -11/12 ) + 0`

`= -13/12`

`d) 5/19 + 8/11 + 14/19 + 3/2 - 30/31`

`= ( 5/19 + 14/19) + ( 8/11 + 3/2 - 30/31 )`

`= 1 + ( 496/682 + 1023/682 - 660/682)`

`= 1 + 859/682`

`= 682/682 + 859/682`

`= 1541/682`

`@Hist`