先分解因式在求值:已知x-y=1,xy=3,求x²y-xy²
问题描述:
先分解因式在求值:已知x-y=1,xy=3,求x²y-xy²
答
x²y-xy²
=xy(X-Y)
=3×1
=3
先分解因式在求值:已知x-y=1,xy=3,求x²y-xy²
x²y-xy²
=xy(X-Y)
=3×1
=3