已知实数x，y满足 ，则目标函数z=x-y的最小值为

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='13603' and id < 1103967 and id<>'1103967' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='13603' and id > 1103967 and id<>'1103967' order by id asc limit 5