2xy(½x²y-2y²x)=2xy×½x²y-2xy×2y²x=2×½×(x×x²)×(y×y)-2×2×(x×x)×(y×y²)=x³y²-4x²y³ (3x²y+4xy²-x³y³)×(-xy...
2xy(½x2y-2y2x) (3x²y+4xy²-x³y³)×（-x
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