(1)计算(x+2)(x-2)-(x-1)的平方=

2024-12-16 00:38:02
推荐回答(1个)
回答1:

(1).2x-5
(2)根2和负根2
(3)x不等于-1时
(4)a-(1/a)/(a^2-1/a)=a-(1/(a^2-1))=11/6
(5) meitu