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等差、等比数列中,有四组基本公式,通项公式an和前n项和公式Sn可视为正整数n的函数,这为我们用函数观点分析数列问题奠定了基础.而函数中最简单的当属一次函数,所以我们研究这四组公式的线性转化.
There are four groups of basic formulae in the arithmetic and geometric progression. The general term an and the first n terms and the formula Sn can be considered as a function of a positive integer n. This lays the foundation for us to analyze the sequence of problems with the functional viewpoint. The simplest is a function, so we study the linear transformation of these four groups of formulas.