因式分解 xy(x-y)- x(x-y)² ,

问题描述:

因式分解 xy(x-y)- x(x-y)² ,

xy(x-y)- x(x-y)²
=x(x-y)[y-(x-y)]
=x(x-y)[y-x+y]
=-x²(x-y)