公差不为零的等差数列{a n}中，前7项和S 7=35，则a 2+a 6的值为

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='13507' and id < 1097078 and id<>'1097078' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='13507' and id > 1097078 and id<>'1097078' order by id asc limit 5