2- Determine o valor das frações:
a) 1 + 1
--- --- =
3 3
b) 9 + 5
--- --- =
10 2
c) 1 - 1
--- --- =
4 6
d) 7 - 1
--- --- =
12 5
a) 1 + 1
--- --- =
3 3
b) 9 + 5
--- --- =
10 2
c) 1 - 1
--- --- =
4 6
d) 7 - 1
--- --- =
12 5
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b) 9/10 + 5/2 = mmc = 10
10:10.9 + 10:2.5 / 10 =
9 + 25 /10 =
34/10
c) 1/4 - 1/6 = mmc = 12
12:4x1 - 12:6.1 / 12 =
3 - 2 / 12 =
1/12
d) 7/12 - 1/5 = mmc = 60
60:12x7 - 60:5x1 / 60 =
5 x 7 - 12 x 1 / 60 =
35 - 12 / 60 =
23 / 60