化简:(a^4-a^2b^2/a²-2ab+b²)÷(a²+ab/b²)×(b&
化简 (a²+b²/a²-b²-a-b/a+b)÷2ab/(a-b)(a+b)&
计算 (a²-2ab+b²-a+b)÷(a-b) (a+b)²÷(a-b)
计算:a/b(a-b)-b/a(a-b);(1/a+1/b)÷a²+2ab+b²/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
3ab+3b²/b(a²+2ab+b²) ×a²-b²/a-b ÷b/
化简:(a^4-a^2b^2/a²-2ab+b²)÷(a²+ab/b²)×(b&
【4ab/(a-b)+(a/b-b/a)÷(1/a+1/b)】÷(a²+2ab+b²)化简
化简 b²-a²/a²-ab÷(a+(2ab+b²/a))·(1/a+1/b)
化简:1.b/(a-b)+a/(a+b)-2ab/(b²-a²)
化简 a²-(2ab-b²)-b²
(a+b/a-b)²×2a-2b/3a+3b÷ab/a²-b²