已知不等式 的解集为 ,则 a+ b为(    )

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='15529' and id < 2638479 and id<>'2638479' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='15529' and id > 2638479 and id<>'2638479' order by id asc limit 5