已知实数x，y满足 ，若目标函数z=x-y的最小值的取值范围是[-2，1]，则实数m的取值范围是

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='32859' and id < 2619226 and id<>'2619226' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='32859' and id > 2619226 and id<>'2619226' order by id asc limit 5