在学习了数列之后,大家会经常遇到已知a_1及递推公式a_(n+1)=f(a_n),求数列{a_n}的通项公式的问题,很多题目令人感到非常棘手.本文将就此问题给出一个“公式”性的方法——不动点法,应用此法可巧妙地处理此类问 After learning the sequence, we often encounter the problem of knowing the general formula of a_1 and the recursion formula a_ (n + 1) = f (a_n) and finding the {a_n} sequence. Many questions are troublesome. This article will give a question on this “formula ” method - fixed point method, the application of this method can cleverly handle such questions