化简(1-1/a-1)÷a方-4a+4/a方-a

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答案和解析

(1-1/a-1)÷a方-4a+4/a方-a
=(a-2)/(a-1)÷(a-2)²/[a(a-1)]
=(a-2)/(a-1)×a(a-1)/(a-2)²
=a/(a-2)

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