Question

化简求值(xy-x²)/xy分之x²-2xy+y²乘x²分之x-y,其中y=二分之一

Answer 1

(xy-x²)/xy分之x²-2xy+y²乘x²分之x-y,其中y=二分之一
=x(y-x)/(x-y)²/(xy)×(x-y)/x²
=-y;
=-1/2;

追问

中间化简过程能在详细点吗？？谢了

追答

(xy-x²)/xy分之x²-2xy+y²乘x²分之x-y,其中y=二分之一
=x(y-x)/(x-y)²/(xy)×(x-y)/x²
=x(y-x)×xy/(x-y)²×(x-y)/x²
=-x²y/(x-y)×(x-y)/x²
=-y;
=-1/2;