(1+1/n)^n=e^[n ln(1+1/n)]
åå¼={e^[1-n ln(1+1/n)]-1}/(1/n)
ç¨çä»·æ ç©·å°
e^t-1~t,t->0
æ¤å¤t=1-n ln(1+1/n)
æ以åæéå为
[1-n ln(1+1/n)]/(1/n)
ä¸
[1-x ln(1+1/x)]/(1/x)çæéä¸è´(xæ¯è¿ç»çï¼å¯ä»¥æ±å¯¼)
åé代æ¢
y=1/x
y->0
åæéå为
[1-ln(1+y)/y]/y
=[y-ln(1+y)]/y^2
0/0
ç½æ¯è¾¾
=[1-1/(1+y)]/(2y)
=[y/(1+y)]/(2y)
=1/[2(1+y)]
åæéy->0
=1/2
æ以æ¤æé为1/2
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