关于x的不等式(1＋m)x 2＋mx＋m＜x 2＋1对x∈R恒成立，则实数m的取值范围是(  )

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='15530' and id < 2638551 and id<>'2638551' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='15530' and id > 2638551 and id<>'2638551' order by id asc limit 5