已知x、y、z均为正数，则三个数中

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='15531' and id < 2638691 and id<>'2638691' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='15531' and id > 2638691 and id<>'2638691' order by id asc limit 5