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如果数列{a_n}的第n项与它前一项或几项的关系可以用一个式子来表示,那么这个公式叫做这个数列的递推公式.用递推公式表示的数列就叫做递推数列.递推数列是我们随时会碰见的数学问题,许多老师也会分门别类地给同学们罗列若干实战的解决方法,学生遇到类似的问题老想对号入座、依葫芦画瓢.殊不知,这样做有时反而使得学生难以适从.事实上,我们知道,不管题目形式怎样变,它们的解决方法或思想方法总是万变不离其宗,是有章可循的.况且,高考常
If the relationship between the nth term of {a_n} and one or more of its preceding terms can be expressed by an equation, then the formula is called the recursion formula of the series. The sequence represented by the recursion formula is called the recursion sequence The recurrence sequence is a mathematical problem that we will meet at any time, and many teachers will also provide some practical solutions to the students in different categories. Students encounter similar problems and want to sit on the block, Making it difficult for students to adapt. In fact, we know that no matter how the subject form changes, their solutions or ways of thinking are always changing, there is a rule. Moreover, the college entrance examination often