Efetue as multiplicações:
a) 3y.(4x²-2x³-7)
b) (x (elevado a quarta potência) -3x²-5x+1).(-4x)
c) 2x.(y²+xy+1)
d) 4ab.(a²+b²-ab)
e) 4xy².(4x+y+1)
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