化简:(a-a/a+1)÷(a²-2a)/(a²-4)×1/(a+2)
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化简:(a-a/a+1)÷(a²-2a)/(a²-4)×1/(a+2)
化简:(a-a/a+1)÷(a²-2a)/(a²-4)×1/(a+2)
化简:(a-a/a+1)÷(a²-2a)/(a²-4)×1/(a+2)
(a-a/a+1)÷(a²-2a)/(a²-4)×1/(a+2)
=a²/(a+1)×(a+2)(a-2)/a(a-2)×1/(a+2)
=a/(a+1)
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