已知x-y=3,xy=10,则x²y-xy²=

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已知x-y=3,xy=10,则x²y-xy²=
已知x-y=3,xy=10,则x²y-xy²=

已知x-y=3,xy=10,则x²y-xy²=
x²y-xy²
=xy(x-y)
=10×3
=30

不会

原式=xy(x-y)=30.

x^2y-xy^2
=xy(x-y)
=30

x²y-xy²=(x-y)xy=30

x*xy-xy*y= xy*(x-y)=30

x²y-xy²
=xy(x-y)
代入后，得：
原式：=30