已知x-y=2,xy=15,则x²y-xy²的值为.

已知x-y=2,xy=15,则x²y-xy²的值为.
已知x-y=2,xy=15,则x²y-xy²的值为.

已知x-y=2,xy=15,则x²y-xy²的值为.
解
x-y=2,xy=15
x²y-xy²
=xy(x-y)
=15×2
=30

知x-y=2,xy=15,
x²y-xy²
=xy(x-y)
=15*2
=30

x²y-xy²=xy(x-y)=15x2=30

解:x²y-xy²=xy(x-y) =15*2=30

望采纳！谢谢！

30，提公因式