题目

Earlier this year I removed all Internet services from my home, which was very upsetting at first, but I have lived that way. 【1】I was not content with the time I was wasting—I felt I could do more purposeful things than spend it on the Internet. If there is something I want to research on the Internet. I write it down and use that list when I have Internet access, 【2】 I’ll go to the office, the library, the coffee shop, or some other place with free public Wi-Fi, and work on what I need to do online.【3】 I log on (登录) to watch some videos or laugh at funny pictures, but I g 设等差数列{an}的首项a1及公差d都为整数，其前n项和为Sn． (1)若a11＝0，S14＝98，求数列{an}的通项公式； (2)若a1≥6，a11＞0，S14≤77，求所有可能的数列{an}的通项公式．