已知方程
(
是常数)表示曲线
,给出下列命题:
①曲线
不可能为圆;②曲线
不可能为抛物线;
③若曲线
为双曲线,则
或
;
④若曲线
为焦点在
轴上的椭圆,则
.
其中真命题的编号为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d31cd182ad7701448ec961951573b2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
①曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
③若曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65d1eec645764636c0e23b05e8f93234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71badab736269c6567a3977823e2f9b1.png)
④若曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecd47523df67422eec311498d5afe70d.png)
其中真命题的编号为
更新时间:2016-12-03 14:14:17
|
相似题推荐
填空题-单空题
|
适中
(0.65)
名校
【推荐1】给定两个命题,
:对任意实数
都有
恒成立;
:方程
表示焦点在
轴上的椭圆.如果
为真命题,则实数
的取值范围是_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5abdea09520a9022a2f1e07bf12afe6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08c0e91b926aa053bafeddccdd1dd90e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1615a7f1e90ff4f2e21e9425b49183dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
名校
【推荐2】椭圆
的焦点在
轴上,且
,
,则满足题意的椭圆的个数为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1542c48f287494f0c5f70a5c9eb6bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b4569c9227210f58d4aaede99168f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf99e8c9001b828bdcdff7bc93873440.png)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
【推荐1】若方程
表示焦点在x轴上的双曲线,则实数k的取值范围是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2b25c2d66e44a9b1e1bce18cf0bb08.png)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
【推荐2】若方程
表示双曲线,则实数m的取值范围是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f22a15671f5f6dfea46c360daa6d50c.png)
您最近一年使用:0次