计算:(1/(a+1))-a-1

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计算:(1/(a+1))-a-1

1/(a+1))-a-1
=1/(a+1)-(a+1)²/(a+1)
=[1-(a+1)²]/(a+1)
=(1-a²-2a-1)/(a+1)
=-(a²+2a)/(a+1)