1 . 已知下列命题:(1)存在
,使得
;(2)“
”是“函数
为偶函数”的充分不必要条件;(3)
,使
成立;(4)已知两个平面
,
,若两条异面直线m,n满足
,
且
,
,则
;其中是真命题的有______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d229cbec798c9c278a9b5979cb38247.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c765e3bbd5edb34239970779cf4cb5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0e7490f5a6ddb2feae7b184cc9d4dca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/067b23f555aeef86e843d71155fd6e8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94f8287a86613c78187e69b258c2d5f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70835c9d209ddffdf3e97730bd61bce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/539a38ada26356d73024fb8533449c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209323a7a4d015f7e570ec578c1731f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc01d7aa51bf4f95c4b12ae9dcb7eb4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df0d37b44de48de51555fa95d94e33f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/384a65ca1ee3d7d86b988ca34c885e18.png)
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2 . 下列说法中,不正确的是( )
A.已知![]() ![]() ![]() |
B.命题:“![]() ![]() |
C.命题“![]() ![]() ![]() ![]() |
D.“![]() ![]() |
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3 . 下列四个结论:
①若
,则
恒成立;
②命题“若
,则
”的逆否命题为“若
,则
”;
③“命题
为真”是“命题
为真”的充分不必要条件;
④命题“
”的否定是“
”.
其中正确结论的个数是
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80fcb77b3bdf39c6c3b6081c8663a6aa.png)
②命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d10805fbb6b50f351305edfa18c7fcfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45f673c56a289ea78831c9237e8d20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f0e9c04402a0ffdaa25c3e3c82c7dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0563035d307e1e12c2ad967fd20fff11.png)
③“命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13472bf0353e16784a22e1f890fba40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f675824e539f50cec53120959d32e554.png)
④命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a92e233a5c90d5458ce9d63404eb764b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/126f2453fb2e47dee47a1eee77150236.png)
其中正确结论的个数是
A.1个 | B.2个 | C.3个 | D.4个 |
您最近一年使用:0次
2016-12-05更新
|
443次组卷
|
5卷引用:2017届四川凉山州高三理上学期一诊考试数学试卷