数列的通项公式是给出数列的主要方式,其本质就是函数的解析式.围绕数列通项公式,不仅可以判断数列的类型,研究数列的项的变化规律,而且有利于求数列前n项和.而利用递推关系求数列的通项公式又是数列的核心问题之一.因此,本文通过举例来介绍几种常用的求法.1.辅助数列法利用数列的递推关系,构造一个新的数列 The general formula of series is the main way to give out series, the essence of which is the analytic formula of function.With the formula of serial formulas, we can not only judge the type of series, but also study the variation law of series terms, And the use of recursive relations to solve the general formula of the sequence is one of the core issues in the series.Therefore, this article introduces several commonly used method by example.1.Auxiliary sequence method using sequence recursion, construct a new The sequence