题目内容
下列不等式的解集是空集的是（ ）
2021-07-21
A.x2-x+1＞0
B.-2x2+x+1＞0
C.2x-x2＞5
D.x2+x＞2
试卷相关题目
SQL Error: select id,body,options from ***_enewstiku_ where sourceid='15528' and id < 2627627 and id<>'2627627' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='15528' and id > 2627627 and id<>'2627627' order by id asc limit 5