Respostas

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2014-04-11T20:40:23-03:00
(a+b)² + 2(a.b)
= a² + 2ab + b² + 2ab
= a² + 4ab + b²
2 5 2
2014-04-11T21:54:14-03:00
(a+b) +2 (a x b)=
a² + 2 x a x b + b² +2ab=
a² +2ab + b² + 2ab=
a² + 4ab + b²