2015年高考数学文科(山东卷)第19题是一道以数列为背景的综合性试题.本题中的2个小题具有较好的层次性和区分度,第(2)小题对考生来说有一定的难度,但解题的入口宽,可以从多角度、多思路求解,是一道考查学生的基础知识和运用已学知识分析问题和解决问题的综合分析能力的好题.下面对试题中的第(2)小题多思路求解进行解析.题目设数列{an}是首项为正数的等 The 19th question of mathematics and liberal arts in Shandong college entrance examination (Shandong volume) in 2015 is a comprehensive test with the sequence as the background. The 2 small questions in this question have a good level of hierarchy and distinction, and the second is the candidate There is a certain degree of difficulty, but the problem-solving entrance wide, from multiple perspectives, more ideas to solve, is a test of students’ basic knowledge and use of knowledge has been learned to analyze and solve problems comprehensive analysis of the problem. In the first (2) Problem solving more ideas to solve the problem set column {an} is the first positive and so on