lim（n→∞）（1+2/n）^-n
=lim（n→∞）{[1+1/(n/2）]^(n/2)}^(-2)
=e^(-2)
用到一个极限
lim（n→∞）(1+1/n)^n=e
求一求极限题的解答过程lim（n→∞）（1+2/n）^-n=e^-2
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