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