Para que a fatoração a 3 + b3 = (a + b) . (a2 - ∆ + b2 ) esteja correta, devemos substituir ∆
Para que a fatoração a 3 + b3 = (a + b) . (a2 - ∆ + b2 ) esteja correta, devemos substituir ∆ por: a) ab b) 2ab c) 3a2b d) 3ab2 e) 2a2b 2
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