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高数 | 武爷『经典系列』每日一题思路及易错点总结
2022-07-26 08:52:00 【西皮呦】
经典错误
1、在判断间断点及其类型时,对函数做变形,注意有没有把分母等于0的因子消掉。这样的话就有可能把间断点消没了。—— 259题
常见思路
1、有界条件的使用:有界 x 无穷小 = 无穷小 —— 260题
每日一题及过程
259:带x^n的极限(极限定义函数)
【经典错误】在判断间断点及其类型时,对函数做变形,注意有没有把分母等于0的因子消掉。这样的话就有可能把间断点消没了。错选C。
【思路】
首先应该想到

补充:

260:有界条件的使用
【思路】f(x)在 1 处连续,则极限值等于1函数值,欲求函数值,转求极限值,看题干,想求的极限在分子上,其分母为0(无穷小),想到 有界x无穷小=无穷小。

261:
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