数学是数学竞赛中重要课题之一 ,许多数列都是通过递归公式给出的 数列的递归式有线性递归式和非线性递归式两种 ,线性递归式都有具体的模型可循 而非线性递归数种类繁多 ,解决这些问题的方法很多 ,但是可通过好方法转化为线性的来处理 ,下面介绍一些常见的转化方法 1　特征 Mathematics is one of the important topics in mathematics competition. Many sequences are recursive formulas given by recursive formulas. There are two kinds of recursive linear recursive and nonlinear recursive. Linear recursive models have specific models to follow and nonlinear recursion. There are many kinds of numbers and there are many ways to solve these problems, but they can be converted into linear ones through good methods. Here are some common methods of conversion: