3ab+3b²/b(a²+2ab+b²) ×a²-b²/a-b ÷b/
3ab+3b²/b(a²+2ab+b²) ×a²-b²/a-b ÷b/
(a+b/a-b)²×2a-2b/3a+3b÷ab/a²-b²
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)
a³+a²b-(4a²b+3ab²)+b³+6ab²+2b&
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:(a²b+2ab²-b^3)÷b-(a-b)(a+2b),其中a=½,b=
计算:(a²-b²)/(a+b)+(a²-2ab+b²)/(a-b)
a-ab+b²-b 因式分解
化简a/a-b - b-a+b + 2ab/a²-b²
(3a³b²)÷a²+b(a²b-3ab)
3a²b+ab²-2a²b²-3ab²-3a²b+4ab