不等式 ax 2＋ bx＋2＞0的解集是 ，则 a＋ b的值是(　　)

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='15529' and id < 2638549 and id<>'2638549' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='15529' and id > 2638549 and id<>'2638549' order by id asc limit 5