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数列的通项公式是研究数列知识的基础,求数列的通项公式是认识数列进而研究数列的关键,如果数列的各项能用项数n的解析式来表示,那么由这个解析式就得到了数列的各项.但是由于数列的类型多,每个数列的通项公式是不同的:有的数列只要认真观察、联想便可得到通项公式;有的数列实际上是等差数列或等比数列,其通项公式已有定式;还有的数列其通项与项数n的规律必须从题目中研究挖掘出来.
The general formula of series is the basis for studying series knowledge. The general formula of series is the key to recognize the series and then study the series. If the items of the series can be represented by the analytic formula of the number of items n, then the analytical formula The number of columns. However, due to the type of the number of columns, the general formula of each series is different: some series can be obtained as long as a serious observation, association, general formula; some series is actually an arithmetic series or other For the series, the general term formula has been established; other series have their general terms and the law of the number of items n must be excavated from the topic.