已知两个正数a、b的等差中项是5，则a 2、b 2的等比中项的最大值为

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='13507' and id < 1097086 and id<>'1097086' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='13507' and id > 1097086 and id<>'1097086' order by id asc limit 5