化简:{(a2-4a+4)/(a2+2a+1)}× {(a+1)/(a²-4)}

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化简:{(a2-4a+4)/(a2+2a+1)}× {(a+1)/(a²-4)}

{(a2-4a+4)/(a2+2a+1)}× {(a+1)/(a²-4)}
=[(a-2)²/(a+1)²]×[(a+1)/[(a+2)(a-2)]]
=(a-2)/[(a+1)(a+2)]