a-2分之a平方-1乘(1-a-1分之1)

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a-2分之a平方-1乘(1-a-1分之1)

=(a+1)(a-1)/(a-2)×[(a-1)-1]/(a-1)
=(a+1)(a-1)/(a-2)×(a-2)/(a-1)
=a+1

(a-1)/(a-2)×[1-1/(a-1)]
=(a-1)/(a-2)×(a-2)/(a-1)
=1.