求数列的通项在数列中是一个最重要的课题,07年高考十九份试卷中,一半以上均有直接求数列通项的题目,求通项的解题方法和技巧很多,但总的思路有两种:其一是找出α_n与α_(n-1)的关系求通项,其二是找出S_n与S_(n-1)的关系求S_n,再由α_n=S_n—S_(n-1)得通项. Finding the general term of the series is one of the most important topics in the series. Of the 19 examination papers in the college entrance examination in 2007, more than half had the problem of directly seeking the general term of the series. There are many methods and techniques for solving the general term, but the total There are two ways of thinking: one is to find out the relationship between α_n and α_(n-1), and the second is to find out the relationship between S_n and S_(n-1) to find S_n, and then by α_n=S_n_S_ ( N-1) Getting items.