(a-b)²-(a-b)-2
(a+b)/(2a+2b)乘(a²+b²)/(a²-b²) 计算
化简:(b²-a²)/(a²-2ab+b²)
2b²/(a-b)-b-a化简
就一道填空(a²+ab-2b²)/(a²-b²)=( )/(a+b)
2(a²b+3ab²)-3(a²b-1)-2a²b-2
第一题:2(b-a)²-a(a-b).
化简代数式【(a²+b²/a²-b²)-(a-b/a+b)】÷2ab/(a-b)
(a²+b²)²-4a²b²化简
已知a+b=-2,ab =-3,求a(a²-b²)-a(a²+b²)²
2(a²+b²)(a+b)²-(a²-b²)²
A²+B²=___(A-B)__
已知(a+2)²+丨a+b+5丨=0,求3a²b-[2a²b-(2ab-a²b)