Question

efetue as frações
1/6 +1/4 =
3/2 + 1/3 =
1/2 + 1/5 - 3/6 =
8 - 7/6 =
7/2 + 1 1/8 =
1/5 + 2 2/8 =
3 2/5 - 1/7 =
7/8 - 4/9 =

Answer 1

1/6 + 1/4 = 2/12 + 3/12 = 5/12  MMC=12
3/2 + 1/3 = 9/6 + 2/6 = 11/6  MMC=6
1/2 + 1/5 - 3/6 = 15/30 + 6/30 - 15/30 = 6/30  MMC=30
8 - 7/6 = 48/6 - 7/6 = 41/6  MMC=6
7/2 + 11/8 = 28/8 + 11/8 = 17/8  MMC=8
1/5 + (2 2/8) ???
(3 2/5) - 1/7 ???
7/8 - 4/9 = 63/72 - 24/72 = 39/72  MMC=72