计算:(xy-x2)÷xy分之x2-2xy+y2

问题描述:

计算:(xy-x2)÷xy分之x2-2xy+y2

(xy-x2)÷xy分之x2-2xy+y2
=(xy-x²)÷(x-y)²/xy
=x(y-x)*xy/(y-x)²
=x²y/(y-x)³