极限 limx→∞ x*{e^[1/(x-1)]-1}=?为什么不等于0?

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极限 limx→∞ x*{e^[1/(x-1)]-1}=?为什么不等于0?
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极限 limx→∞ x*{e^[1/(x-1)]-1}=?为什么不等于0?
极限 limx→∞ x*{e^[1/(x-1)]-1}=?为什么不等于0?

极限 limx→∞ x*{e^[1/(x-1)]-1}=?为什么不等于0?
limx*{e^[1/(x-1)]-1} = lim{e^[1/(x-1)]-1}/(1/x) (0/0)
= lim [-1/(x-1)^2]e^[1/(x-1)]/(-1/x^2)
= lim [x^2/(x-1)^2]e^[1/(x-1)]
= lim [x^2/(x-1)^2] * lim e^[1/(x-1)]
= 1*1 = 1

e^[1/(x-1)]-1为无穷小,等价于1/(x-1),
——》原式= limx→∞ x/(x-1)=1。