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数列是中学数学中的重点内容之一,也是历年高考数学久考不衰的内容.解决数列的有关问题,除了要正确理解数列的有关概念,熟练掌握数列的有关公式外,还要求能体会并运用蕴含于其中的数学思想和方法.等差(比)数列的通项公式与前 n 项和公式,实际上是给出了五个量:a,d(q),n,a_n,s_n 之间存在的二个等式关系,从方程思想看,只要给出其中任意三个量,就可以确定其余的两个量.这就是以方程的思想为工具确定等差(比)数列或研究它的一些性质的认识基
The series is one of the key contents of mathematics in middle school, and it is also a content of the long-term examination of mathematics in the college entrance examination. In order to solve the relevant problems of the series, in addition to properly understanding the relevant concepts of the series, it is also necessary to be familiar with the relevant formulas of the series and also to be able to understand and Using the mathematical ideas and methods embedded in it. The general formula of the difference (ratio) series and the first n terms and the formula are actually given five quantities: a, d(q), n, a_n, s_n There are two equations between the two equations, from the perspective of the equation, as long as any three of them are given, the remaining two quantities can be determined. This is to use the idea of the equation as a tool to determine the arithmetic progression or to study it. Some of the properties of the