Respostas

2014-06-01T00:29:40-03:00
(4x-y)² = 16x²-8xy+y²
(4x-y)³ = (4x-y)² (4x-y) = (16x²-8xy+y²)(4x-y) = 64x³-16x²y-32x²y+8xy²+4xy²-y³ =
= 64x³-48x²y+12xy²-y³
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