Respostas

2013-08-12T22:11:52-03:00
(a+b)³ = a³ + 3a²b+3ab²+b³

(x-20)³ = x³ + 3x².(-20) + 3x.(-20)² + (-20)³
= x³ - 60x² + 1200x - 8000

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