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

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

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

(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