Question

Efetue as operações com frações (Justifique a resposta com cálculos )

a) 3/2 + 2/3

b) 7/12+11/20

c) 5/8-1/4

d) 4/5-2/3

Answer 1

a) 3/2 + 2/3 = ----mmc(2,3)=6
    9/6 + 4/6 = 13/6

b) 7/12+11/20 = ---mmc(12,20) = 60
     35/60 + 33/60 = 68/60 = 34/30= 17/15

c)  5/8-1/4= ---mmc(4,8)= 8
     5/8 - 2/8 = 3/8

d) 4/5-2/3 =---mmc(3,5) = 15
     12/15 - 10/15 = 2/15