题目内容
已知椭圆方程
,那么它的焦距是
试卷相关题目
SQL Error: select id,body,options from ***_enewstiku_ where sourceid='32862' and id < 2619427 and id<>'2619427' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='32862' and id > 2619427 and id<>'2619427' order by id asc limit 5