根据数列{an}的递推关系求通项,虽然不一定都有固定的方法,但是有些递推关系经过变形,可使问题转化为我们熟知的形式;研究并掌握这些方法,对于有效地解决部分数列的通项问题,从中获得研究数列通项的一般方法,积累研究数列性质的经验等都是大有裨益的·1可变形为“an+1=an+f(n) According to the recursive relation of the sequence {an}, though some methods are not necessarily fixed, some of the recursion relations can be transformed into the well-known forms by our recurrence. Studying and mastering these methods can effectively solve the problem The general problem of partial series, the general method of deriving the general term of the series, and the accumulation of experience in the nature of the series are all of great help. 1 Deformable into "an + 1 = an + f (n)