12-13高三上·湖北黄冈·期末
1 . 下列四种说法中,错误的个数是
①
的子集有3个;
②“若
”的逆命题为真;
③“命题
为真”是“命题
为真”的必要不充分条件;
④命题“
,均有
”的否定是:“
使得
”
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75d7f04f13ba374800169bf585d855bb.png)
②“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c1f80c672d6a30cd38174dba1efb53.png)
③“命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0045a603e555d2d2a8ef634f9edf9951.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a31351c3868449fd115650c13152be8.png)
④命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51d05bfb81fb639a2697789174ac6f21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/175a7fc8d07909895962f8749a70d1ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c4a9609e6ebf52ceb4461226cab527b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ff5fb12185c7434c1a3f6ec27cba102.png)
A.0个 | B.1个 | C.2个 | D.3个 |
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