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因数列 { an}是定义在正整数集或其有限子集上的函数 ,故若给出一个数列的前若干项 ,欲求其通项公式 ,是和求函数解析式有密切关联的一个问题 .假若给定数列的前几项 ,能否写出其通项公式 ?如果能的话 ,能写出多少个 ?例 1 已知数列的前三项为 :3,9,2 7,请写出它的一个通项公
The coefficient column {an} is a function defined on a positive integer set or its finite subset. Therefore, if the first few terms of a sequence are given, the general term is desired. This is a problem that is closely related to the analytical expression of the function. If you give the first few terms of a series, can you write out its general term formula? If so, how many can you write? Example 1 The first three items of the known series are: 3,9,2 7. Please write it out. a general public