11-12高三上·河南洛阳·期末
1 . 下列命题中的真命题的个数是
(1)命题“若
,则
”的否命题为“若
,则
”;
(2)若命题
,则
;
(3)设命题
,命题
,则
为真命题;
(4)设
,那么“
”是“
”的必要不充分条件.
(1)命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828765097c682c0b260c81e5bf6229a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29b331c584ed0830e4ff61f035331028.png)
(2)若命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d79ce8dc943dea5bd017ac4275480416.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c293e6f108231484cd9785a8696556a6.png)
(3)设命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eab9df7b6c8a2496fd5b23337097ec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f316d9eef34d4c914e6cfd89ee2f1a7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac2e4974421a8728f8e2b0a8b068e47a.png)
(4)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec2d3e11443ecc11be42afb2813d2bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667b9d8266b8070f1c3ced34edb68e38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01f9d3e45494d3d5ac3bc405f7c7cb30.png)
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