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对于递推公式确定的数列的通项,通常可以通过递推公式的变换使之转化为等差数列或等比数列。有时会用到一些特殊的转化方法,就两类特殊数列例谈两个重要恒等式的应用。
For the general term of a sequence determined by a recurrence formula, it can usually be converted into an arithmetic sequence or an equal sequence by a transformation of a recurrence formula. There are times when some special transformations are used to address the application of two important identities for two special types of sequences.