已知x-y=2,xy=15,则x²y-xy²的值为.
问题描述：
已知x-y=2,xy=15,则x²y-xy²的值为.
答
x²y-xy²=xy(x-y)=15x2=30
答
解:x²y-xy²=xy(x-y) =15*2=30
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答
30，提公因式
答
知x-y=2,xy=15,
x²y-xy²
=xy(x-y)
=15*2
=30
答
解
x-y=2,xy=15
x²y-xy²
=xy(x-y)
=15×2
=30