a-1分之a^2+a除以(a-a-1分之a)
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[(a²+a)/(a-1)]/[a-a/(a-1)]
=[(a²+a)/(a-1)]/[(a²-2a)/(a-1)]
=(a²+a)/(a²-2a)
=a(a+1)/[a(a-2)]
=(a+1)/(a-2)
=(a-2+3)/(a-2)
=1+3/(a-2)
=[(a²+a)/(a-1)]/[(a²-2a)/(a-1)]
=(a²+a)/(a²-2a)
=a(a+1)/[a(a-2)]
=(a+1)/(a-2)
=(a-2+3)/(a-2)
=1+3/(a-2)
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