论文部分内容阅读
数列的前n项和Sn与其通项an密切地联系在一起,在历年的高考中,有关Sn与an的数列问题层出不穷,值得关注.在求解相关的数列问题时,常会遇到条件中含有Sn与an的混合式,处理这一类问题的思路一般是将条件中的Sn与an视作两个未知量,利用an=SnSn-1(n≥2)作为桥梁,消去Sn或消去an即可顺利解决问题.笔者针对以上两种解题策略采取不同的处理方式求解相关问题,以期能帮助同学们有的放矢,更好地理解掌握相关知识.
The first n terms of the series and Sn are closely related to their general an. In the past years of college entrance examination, the series of questions about Sn and an an endless stream are worthy of attention. When solving related sequence problems, often encounter the conditions containing Sn Mixed with an, the idea of dealing with this type of problem is generally the condition of Sn and an as two unknowns, the use of an = SnSn-1 (n ≥ 2) as a bridge, eliminating Sn or eliminating an Smooth solution to the problem.According to the above two kinds of problem solving strategies, the author adopts different ways to solve the related problems, with a view to helping students to help them better understand and master relevant knowledge.