函数思想是基本的数学思想 ,函数方法是数学中的基本方法 ,在学习中 ,我们不能忘记用函数的观点看问题 ,用函数方法解决问题 .数列可以看成正整数集上的函数 ,在解决数列问题时常常可以用函数方法来解决 .本文着重探讨函数与数列的内在联系 ,从函数观点认清公式本质 .一、an 及 The function idea is the basic mathematical idea. The function method is the basic method in mathematics. In learning, we can not forget to look at the problem from the point of view of the function, and use the function method to solve the problem. The sequence can be seen as a function of the positive integer set, solving the sequence Problems can often be solved by using function methods. This article focuses on the intrinsic link between functions and sequences, and recognizes the nature of formulas from a functional point of view.