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函数的周期问题是一类难度较大且又易被忽视的问题,近一段时间在一些模拟题和练兵题中几道题目出现了带有共性的问题,特收集起来,共大家参考.
The problem of the periodicity of functions is a difficult and easily overlooked issue. In recent days, several questions have appeared in common in several questions and training questions. They are collected together for reference.