在研究数列递推关系问题时,我们研究得较多的是同一个数列{an}中若干项间的递推关系,或者是an与sn(sn为数列{an}的前n项和)间的递推关系。但在我们的教学中有时也会出现两个不同数列{an}与{bn}混合在一起的递推关系,这类题型一般较难,学生学习较吃力。下面我来谈谈这一类题型处理通项的方法。 In the study of sequence recursion relations, we study more recursion relations among several items in the same sequence {an}, or between an and sn (where sn is the first n terms and the sum of series {an}) Recursive relationship. However, in our teaching, sometimes there are two recurring relations in which different numbers {an} and {bn} are mixed together. Such questions are generally difficult and students find it hard to learn. Now let me talk about this type of problem-solving approach.