Respostas

2013-11-05T19:31:24-02:00
A) 3/x + 2/5 = 3/4
mmc (x,5,4) = 20x
(20x:x.3) + (20x:5.2) = (20x:4.3)
60 + 8x = 15x
15x - 8x = 60
7x = 60
x = 60/7
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