求极限limn→∞[(n+n+1)/(n-1)2
求极限limn→∞[(n+n+1)/(n-1)2
【正确答案】：limx→∞(n2+n+1)/(n-1)2=limx→∞[(1+1/n+1/n2)/(1-1/n)2]=1
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