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我们知道数列的通项ａｎ 是下标ｎ的函数 ,即ａｎ=ｆ(ｎ) ,其实义域为Ｎ 或它的有限子集 {1,2 ,… ,ｎ}.这就是说数列是自变量取正整数的一种特殊函数 (即整标函数 ) .因此可以利用函数的知识、性质、方法确定数列的问题 .利用函数知识解决数列问题有两种方式 :一种是直接利用
We know that the general term an of the series is a function of the subscript n, that is, an = f(n) , in which the semantic domain is N or its finite subset {1,2,...,n}. This means that the sequence is an independent variable. Take a special function of a positive integer (ie, a scalar function). Therefore, you can use the knowledge, nature, and methods of the function to determine the problem of a sequence of numbers. There are two ways to solve a sequence of problems using function knowledge: One is the direct use of