A.4a3.2a2=8a6B.5x3.3x4=8x7C.(-2x4)·(-3x4)=6x8D.(-x)(-2x)3·(-3x)3=-108x6
A.21x3+42x2B.15x3+18x2C.36x2+72xD.36x3+72x2
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