计算:① a-b/a²+ab ÷ ab-a²/a²b²-a⁴ ②(xy-x²) ÷ x-y/xy

问题描述:

计算:① a-b/a²+ab ÷ ab-a²/a²b²-a⁴ ②(xy-x²) ÷ x-y/xy

(a-b)/(a²+ab) ÷ (ab-a²)/(a²b²-a⁴)
=(a-b)/a(a+b)×a²(b²-a²)/a(b-a)
=(a-b)/a(a+b)×a(b+a)
=a-b请问:第二题怎样做呢?麻烦您了!(xy-x²) ÷ (x-y)/xy=x(y-x)乘xy/(x-y)=-x²y请点击“采纳为满意答案”,祝学习进步!