已知等差数列{an}中，a2+a8=8，则该数列前9项和S9等于（  ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='24153' and id < 2089641 and id<>'2089641' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='24153' and id > 2089641 and id<>'2089641' order by id asc limit 5