(1)a²-a-1=a²-() (2)a ²-2a+2=a²-2()

问题描述:

(1)a²-a-1=a²-() (2)a ²-2a+2=a²-2()
(1)a²-a-1=a²-()
(2)a ²-2a+2=a²-2()

a+1
a-1