在等差数列（a n）{ }中a 4+a 6+a 8+a 10+a 12=120，则2a 9-a 10=

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='13503' and id < 1096535 and id<>'1096535' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='13503' and id > 1096535 and id<>'1096535' order by id asc limit 5