三个数成等差数列，其平方和为450，两两之积的和为423，则中间一个数为

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='13507' and id < 1097088 and id<>'1097088' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='13507' and id > 1097088 and id<>'1097088' order by id asc limit 5