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数列问题一直是高考的高频考点,也是高三复习备考的主干知识.近几年在全国卷和各省市的高考卷中陆续出现了一些递推式中含(-1)n的数列求和问题,这些问题的处理方法大同小异,只要掌握基本方法和原理,完全可以做到逢题必会,逢考必胜.下面,笔者给出这类问题的几种处理策略,以飨读者.一、形如an=(-1)~n·f(n),用并项求和法处理所谓并项求和法,就是将待求数列的前n
The series problem has always been the high-frequency test point for college entrance examinations, and it is also the backbone knowledge for senior high school students to review the pro forma. In recent years, several recurring formulas with (-1)n series summation problems have appeared in the national examination volume and the provincial college entrance examination volumes. The methods for dealing with these problems are very much the same. As long as you master the basic methods and principles, you can achieve every problem and every victory. Below, the author gives several processing strategies for this kind of problems to readers. If an = (-1) ~ n · f (n), using the term summation method to deal with the so-called term summation method, that is, the number of columns to be solved