已知x-y=1,xy=2求x^3y-2x^2y^2+xy^3

2025-03-03 20:37:32
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回答1:

x^3y-2x^2y^2+xy^3
=xy(x^2-2xy+y^2)
=xy(x-y)^2
=2*1^2
=2