Respostas

2013-11-17T16:26:34-02:00
5/11=35/x multiplica cruzado
5x=35.11
5x=385
x=385/5
x=77

logo, 5/11=35/77

e 30/81=x/27
30.27=x.81
810=81x
810/81=x
10=x

entao, 30/81=10/27

espero ter ajudado
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