化简(a²+b²/a²-b²-a-b/a+b)÷2ab/(a-b)(a+b)
化简 (a²+b²/a²-b²-a-b/a+b)÷2ab/(a-b)(a+b)&
计算:a/b(a-b)-b/a(a-b);(1/a+1/b)÷a²+2ab+b²/a+b.
计算 (a²-2ab+b²-a+b)÷(a-b) (a+b)²÷(a-b)
先化简,再求值;[(2a-b/a+b)-(b/a-b)]÷{(a-2b/a+b)+[ab/(a-b)²]},其
化简a/a-b - b-a+b + 2ab/a²-b²
(a-b)(a+b)²-(a+b)(a-b)²+2b(a²+b²)
(a+b/a-b)²×2a-2b/3a+3b÷ab/a²-b²
化简:1.b/(a-b)+a/(a+b)-2ab/(b²-a²)
3ab+3b²/b(a²+2ab+b²) ×a²-b²/a-b ÷b/
化简 a²-2ab+b²/a²-b²+b/a+b
化简:a²-2ab+b²/a²-b²+b/a+b
计算:(a²-b²)/(a+b)+(a²-2ab+b²)/(a-b)