化简;b/a²-b²÷(1-a/a+b)
化简 (a²+b²/a²-b²-a-b/a+b)÷2ab/(a-b)(a+b)&
化简 (a+b)²+2a(a-1/2b)-3(a-b)(a+b)
化简(a-b)²/a²b² *(-a/b-a)³ ÷1/a²-b
计算(a-b分之1-a²-b²分之b)÷a+b分之a
计算:a/b(a-b)-b/a(a-b);(1/a+1/b)÷a²+2ab+b²/a+b.
化简分式b²/(a+b)÷{[a/(a-b)-1][a-a²/(a+b)]}
(a-b)(a+b)²-(a+b)(a-b)²+2b(a²+b²)
化简 b²-a²/a²-ab÷(a+(2ab+b²/a))·(1/a+1/b)
化简:{[(2a-b)/(a+b)]-[b/(a-b)]}÷[(a-2b)/(a+b)]
化简 (a-b)(a+b)²-(a+b)(a-b)²+2b(a²+b²)
【4ab/(a-b)+(a/b-b/a)÷(1/a+1/b)】÷(a²+2ab+b²)化简
因式分解a(a-b)+(b-a)²