若x-y=5,xy=6,则x²y-xy²的值为
问题描述:
若x-y=5,xy=6,则x²y-xy²的值为
答
x²y-xy²
=xy(x-y)
=30
若x-y=5,xy=6,则x²y-xy²的值为
x²y-xy²
=xy(x-y)
=30