【讨论】函数极限问题2
本帖最后由 厚积薄发 于 2010-2-16 10:24 编辑设http://latex.codecogs.com/gif.latex?f%28x%29%3D%5Clim_0%5E%7B+%7D%7B%281-a%5E%7B1/x%7D%29%7D/%281+a%5E%7B1/x%7D%29%28a%3E1%29
解:
f(x)在x=0处没有意义,而
http://latex.codecogs.com/gif.latex?%5Clim_0%5E%7B+%7D%7B%281-a%5E%7B1/x%7D%29/%281-a%5E%7B1/x%7D%29%7D%3D-1
(为什么该式不等于原式)
http://latex.codecogs.com/gif.latex?%5Clim_0%5E%7B-%7D%7B%281-a%5E%7B1/x%7D%7D%29/%281+a%5E%7B1/x%7D%29%3D1
因为http://latex.codecogs.com/gif.latex?%5Clim_0%5E%7B-%7D%7Bf%28x%29%7D%5Cneq%20%5Clim_0%5E%7B+%7D%7Bf%28x%29%7D%2C所以 不存在http://latex.codecogs.com/gif.latex?%5Clim_0%7Bf%28x%29%7D 喂! 那个为什么 x=0 处是没有意义的啊? 完全看不懂你写的什么
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