一、问题的提出记得我在一堂数列求和复习课中,首先对数列的分组求和法和错位相减法进行了讲授,然后叫学生做如下一道数列题:设正项等比数列{an}的首项a1=1/2,前n项和为Sn,且210S30-(210+1)S20+S10=0.(1)求{an}的通项; First, the question raised I remember in a series of summation review class, first of all, the group summation method and misplaced subtraction method of the series were taught, and then asked the students to do the following series of questions: set the positive item equal number sequence {an} The first term a1=1/2, the first n terms are Sn, and 210S30-(210+1)S20+S10=0. (1) Find the general term of {an};