kx 2＋2kx－(2＋k)＜0恒成立，则实数k的取值范围是(　　)

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='15529' and id < 2638547 and id<>'2638547' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='15529' and id > 2638547 and id<>'2638547' order by id asc limit 5