化简: ①4/(a²-4)+2/(a+2)-1/(a-2) ②(a²-a)÷[(a²-2a+1)/(a-1)]
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化简: ①4/(a²-4)+2/(a+2)-1/(a-2) ②(a²-a)÷[(a²-2a+1)/(a-1)]
化简: ①4/(a²-4)+2/(a+2)-1/(a-2) ②(a²-a)÷[(a²-2a+1)/(a-1)]
化简: ①4/(a²-4)+2/(a+2)-1/(a-2) ②(a²-a)÷[(a²-2a+1)/(a-1)]
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