题目(2012年高考全国新课标理科卷第16题数列)数列{an}满足an+1+(-1)nan=2n-1,则{an}的前60项和为_____.亮点1:形式简约,结构美观,内涵朴实本试题仅给出数列满足的一个递推关系,要求其前60项和.整个试题文字与字符极少,表述流畅而精确,给出的递推关系式结构简练而精美,揭示的内涵是数列任意相邻两项的关系,平凡而朴实,要研 The number of an {an} to satisfy an + 1 + (- 1) nan = 2n-1 is the first 60 terms of {an} and is _____. Highlight 1 : The form of simple, beautiful structure, simple connotation of the test questions only give a series of recursive relations to meet the requirements of the first 60 items and the whole test questions with very few words, the expression of smooth and accurate, given the structure of the recursive relationship Concise and beautiful, revealing the connotation of the sequence is any two adjacent relations, ordinary and simple, to research