计算:(1)4y.(-2xy^2) (2)(3x^2y)^3.(-4x)
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计算:(1)4y.(-2xy^2) (2)(3x^2y)^3.(-4x)
解(1):4y×(-2xy²)
=4×(-2)×x×y×y²
=-8xy³
(2):(3x²y)³×(-4x)
=3³×(x²)³×y³×(-4x)
=27×(x^6)×y³×(-4)×x ^表示乘方
=27×(-4)×(x^6)×x×y³
=-108(x^7)y³
=4×(-2)×x×y×y²
=-8xy³
(2):(3x²y)³×(-4x)
=3³×(x²)³×y³×(-4x)
=27×(x^6)×y³×(-4)×x ^表示乘方
=27×(-4)×(x^6)×x×y³
=-108(x^7)y³
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