Respostas

2014-03-11T13:04:42-03:00
1/2 de 20 =10
20.1= 20   20:2=10
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3/4 de 20=15
3.20 = 60  60:4 = 15
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1/8 de 200=25
1.200= 200   200:8=25
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7/5 de 400=560
7.400=2800    2800:5=560
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9/10 de 300=270
9.300= 2700    2700:10 = 270
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12/5 de 120=288
12.120=1440      1440:5 =288
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1/4 de 50= 25/2
1.50 = 50       50= 25
                      4     2
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13/7 de 21=39
13.21=273     273:7 =39
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6/5 de 45=54
6.45= 270    270:5= 54