a-1分之A平方—2a+1-(a-2)

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a-1分之A平方—2a+1-(a-2)
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a-1分之A平方—2a+1-(a-2)
a-1分之A平方—2a+1-(a-2)

a-1分之A平方—2a+1-(a-2)
(a^2-2a+1)/(a-1)-(a-2)
=(a-1)^2/(a-1)-(a-2)
=a-1-(a-2)
=a-1-a+2
=2-1
=1