已知x+y=5,xy=-2,求-x^2y-xy^2

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已知x+y=5,xy=-2,求-x^2y-xy^2已知x+y=5,xy=-2,求-x^2y-xy^2已知x+y=5,xy=-2,求-x^2y-xy^2解x+y=5xy=-2-x²y-xy&#

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

已知x+y=5,xy=-2,求-x^2y-xy^2
解
x+y=5
xy=-2
-x²y-xy²
=-xy(x+y)
=-(-2)×5
=10

-x²y-xy²
=xy(-x-y)
=xy(-(x+y))
=5*(-(-2))
=5*2
=10

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