Question

Efetue as frações.

A) -3+1=
_ _

4 8

B)2-3+1=
_ _ _
5 6 2

C)-9+4-1
_ _ _ =
7 3 2

D)6-2+3
_ _ _
3 4 6

Answer 1

Tire sempre MMC entre eles, fatorando
A)-3/4+1/8=-6/8+1/8=7/8
B)2/5-3/6+1/2=12/30-15/30+15/30=12/30=6/15=2/5
C)-9/7+4/3-1/2=-54/42+56/42-24/42=+2/42-24/42=-22/42
D=6/3-2/4+3/6=24/12-6/12+6/12=24/12