1 . 已知命题:①设随机变量
,若
,则
;②命题“
”的否定是“
”;③在
中,
的充要条件是
;④若不等式
恒成立,则
的取值范围是
;⑤若对于任意的
恒成立,则实数
的取值范围是
;以上命题中正确的是______(填写所有正确命题的序号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cadf6c8eebb52febf76ddcf2dd3e72f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12d5788fc3e5f39261ad76a8296543e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84cd234f6e6846b8f888a22c843fc2a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa4f0a12223f1e1171af131b71a08ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b831ba2421735503f627be26195bdb44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca51be437b1a97ca92aa1159ab71102c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62b2f44bda467c786287c7356d4ed9f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/751198e35299da9c53c51a03f923b5fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db32e93e220abbf23e9dd5fa99f4cc3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18a69716c1d670780db5a929ad157eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee0f0dda1517db63269665eb18b7d61a.png)
您最近一年使用:0次
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2 . 有下列四种说法:
①命题“
”为假,则
、
至少一个为假;
②命题“一次函数都是单调函数”的否定是“一次函数都不是单调函数”;
③动点
到点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
与到点
的距离之和为2,则点
的轨迹是焦点在
轴上的椭圆;
④命题“若直线与双曲线相切,则该直线与双曲线只有一个公共点”的逆命题是真命题.
其中正确的有__________ .(填写序号)
①命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13472bf0353e16784a22e1f890fba40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
②命题“一次函数都是单调函数”的否定是“一次函数都不是单调函数”;
③动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1242ec96ac54e2fd418988d5190a88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4bc333cee094e9dd8f1f3ff86adc95f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
④命题“若直线与双曲线相切,则该直线与双曲线只有一个公共点”的逆命题是真命题.
其中正确的有
您最近一年使用:0次