(1/y-1/x)乘(xy)/(x^2-2xy+y^2)怎么化简

问题描述:

(1/y-1/x)乘(xy)/(x^2-2xy+y^2)怎么化简

(1/y-1/x)*(xy)/(x^2-2xy+y^2) =(X-y)/(x-y)^2 =1/(x-y)