a) `(2012^0)/2` + `|-3|/4` + `5.(-1)^2012/2^3`
= `1/2` + `3/4` + `5/8`
= `5/4` + `5/8`
= `15/8`
b)`-3/4` . `4/7` + `-3/7` . `3/7` + `-2/5`
= `-3/7` + `-3/7` . `3/7` + `-2/5`
= `-3/7`.`(1 + 3/7)` + `-2/5`
= `-3/7` . `10/7` + `-2/5`
= `-30/49` + `-2/5` = `-248/245`
c)`(3/4 - 5/6 + 7/12)` . `(-12/7)`
= `1/2` . `(-12/7)`
= `-6/7`
d)1,4 . `15/49` - `(4/5 + 2/3)` : `2 1/5`
= `7/5` - `22/15` . `5/11`
= `7/5` - `2/3` = `11/15`