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最后一次串讲(修改于1月4号)

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Problem<br />

limx→0 1 1<br />

x − ex −1<br />

∞ − ∞<br />

∞<br />

∞ <br />

∞<br />

∞ <br />

<br />

<br />

<br />

<br />

<br />

1 1<br />

lim −<br />

x→0 x ex e<br />

= lim<br />

− 1 x→0<br />

x − 1 − x<br />

x(ex − 1)<br />

lim<br />

x→0<br />

= lim<br />

x→0<br />

e x − 1<br />

e x − 1 + xe x<br />

ex ex + ex = lim<br />

+ xex x→0<br />

1<br />

2 + x<br />

= 1<br />

2<br />

5 /18

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