数列知识是高考中的重要考查内容,而求数列的通项公式是递推数列考题的常见题型,这类问题可通过构建新数列进行代换,使递推关系式简化,这样就把原数列变形转化为等差数列、等比数列等容易处理的数列,使问题由难变易,化陌生为熟悉,根据不同的递推关系式,采用相应的变形手段,达到转化的目的,从而找到解题的突破口和关键点,它可以培养学生的观察能力、理解能力和逻辑思维能力。下面通过具体的例题来探讨和归纳递推数 Knowledge of sequence knowledge is an important test in the college entrance examination, and the general formula of the sequence of numbers is a recurrence sequence of test questions common problems, such problems can be replaced by the construction of new sequences, so that the recurrence relational simplification, so put the original Transformation of sequence into series such as arithmetic sequence and arithmetic sequence makes the problem familiar from the difficulty and the unfamiliarity. According to the different recursion relations, the corresponding transformation means are used to achieve the goal of transformation so as to find the solution The breakthrough of the title and the key points, it can develop students’ observation ability, ability to understand and logical thinking. The following specific examples to explore and summarize the recursion number