针对一类含离散变量的周期函数极限的计算，给出了一个简单的计算公式，并通过例题体现此公式在解决此类问题上应用的方便和快捷。%Summarized a simple computational formula for the limit of a kind of periodic function which contained discrete variable,and shown the convenience and efficiency of this formula on application in this kind of question through examples.
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