(a平方-2a+1)/(a-1)-(a-2)

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(a平方-2a+1)/(a-1)-(a-2)(a平方-2a+1)/(a-1)-(a-2)(a平方-2a+1)/(a-1)-(a-2)

(a平方-2a+1)/(a-1)-(a-2)
(a平方-2a+1)/(a-1)-(a-2)

(a平方-2a+1)/(a-1)-(a-2)