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问题: 一道数学分式~~

化简:
2/a+1再-(a-2)/(a-1)再除以a^2-2a/a^2-2a+1

解答:

2/a+1 - a-2/a-1 ÷ a^2-2a/a^2-2a+1
= 2/a+1 - a-2/a-1 × (a-1)^2/a(a-2)
= 2/a+1 - a-1/a
= 2a-a^2+1/a(a+1)