已知x+y=-5,xy=7,求x^2y+xy^2-x-y的值

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已知x+y=-5,xy=7,求x^2y+xy^2-x-y的值已知x+y=-5,xy=7,求x^2y+xy^2-x-y的值已知x+y=-5,xy=7,求x^2y+xy^2-x-y的值(x+y)*(xy)

已知x+y=-5,xy=7,求x^2y+xy^2-x-y的值
已知x+y=-5,xy=7,求x^2y+xy^2-x-y的值

已知x+y=-5,xy=7,求x^2y+xy^2-x-y的值
(x+y)*(xy)=x^2y+xy^2=-35
x+y=-5
则 x^2y+xy^2-x-y
=（x^2y+xy^2）-（x+y）
=-35-（-5）
=-35+5
=-30

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