若x，y∈R+且恒成立，则a的最小值是

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='15531' and id < 2638708 and id<>'2638708' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='15531' and id > 2638708 and id<>'2638708' order by id asc limit 5