Respostas

2014-04-12T19:23:09-03:00
4ab- (a+b)²= 4.a.b - a²+2.a.b+ b²=> 4.a.b-2a.b+a²+ b²  = a²+2a.b+b²
(a+b)²= a²+2.a.b+ b²
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