(a²-1/a²-2a+1)+(2a-a²/a-2)÷a是怎样算的呢?

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(a²-1/a²-2a+1)+(2a-a²/a-2)÷a是怎样算的呢?
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(a²-1/a²-2a+1)+(2a-a²/a-2)÷a是怎样算的呢?
(a²-1/a²-2a+1)+(2a-a²/a-2)÷a是怎样算的呢?

(a²-1/a²-2a+1)+(2a-a²/a-2)÷a是怎样算的呢?
(a^2-1)/(a^2-2a+1)+(2a-a^2)/(a-2)÷a
=(a^2-1)/(a^2-2a+1)-(a^2-2a)/(a-2)÷a
=(a-1)(a+1)/(a-1)^2-a(a-2)/(a-2)÷a
=(a+1)/(a-1)-a÷a
=(a+1)/(a-1)-1
=(a+1-a+1)/(a-1)
=2/(a-1)