x³y-2x²y²+xy³
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x³y-2x²y²+xy³x³y-2x²y²+xy³x³y-2x²y²+xy³x
x³y-2x²y²+xy³
x³y-2x²y²+xy³
x³y-2x²y²+xy³
x³y-2x²y²+xy³
=xy(x²-2xy+y²)
=xy(x-y)²
原式=xy(x^2-2xy+y^2)=xy(x-y)^2
x³y-2x²y²+xy³
=xy(x²-2xy+y²)
=xy(x-y)²
x³y-2x²y²+xy³=xy(x²-2xy+y²)
=xy(x-y)²
=xy（x²-2xy-y²）=xy(x-y)²
xy(x2-2xy+y2)=xy（x-y)2, x2和y2是平方的意思