(1+a)(1-a)+(a-2)²
(1+a)(1-a)+(a-2)²
(a 1)(a 2)(a 3)(a
计算:(a+2/a²-2a-a-1/a²-4a+4)÷a-4/a
a/a+2-1/a-1÷a+2/a²-2a+1
(a- 2a/a)÷1-a² / a²+a
a/a-1÷(a-a/2a-1)
a(a-1)(a-2)(a-3)(a-4)因式分解
化简:(2a+1/a²-1)*a²-2a+1/a²-a-(1/a+1)
1/a+1-a+2/a²-1·a²-2a+1/a²+4a+4.
(2/1+a)-(a-2/a-1)÷(a²-2a/a²-2a+1)等于多少
(4a²-3a)+(2+4a-a²)-(2a²+a-1),其中a=-2
2a(a²+3a-2)-3a(a³+2a²-a+1)等于多少?