Respostas

2013-10-30T18:18:53-02:00
(x+4y). (x+4y)= x²+4xy+4xy+16y²= x²+8xy+16y²
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2013-10-30T18:20:31-02:00
(x+4y)².(x+4y)² = =x² + 8yx + 16y²
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