已知实数x、y满足约束条件 ，则z=2x+4y的最大值为

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='32835' and id < 2617980 and id<>'2617980' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='32835' and id > 2617980 and id<>'2617980' order by id asc limit 5