给出下列四个命题:
①若集合
满足
则
;
②给定命题
,若
为真,则
为真;
③设
,若
,则
;
④若直线
与直线
垂直,则
.
其中正确命题的个数是( )
①若集合
![](https://img.xkw.com/dksih/QBM/2013/3/11/1571133911506944/1571133916446720/STEM/4ff2c9e1a37d4bb99dacd0878f280fc2.png)
![](https://img.xkw.com/dksih/QBM/2013/3/11/1571133911506944/1571133916446720/STEM/938e21e9c24b47c19ba99dea546c55c4.png)
![](https://img.xkw.com/dksih/QBM/2013/3/11/1571133911506944/1571133916446720/STEM/d9133873da924afb940345f1ebea4973.png)
②给定命题
![](https://img.xkw.com/dksih/QBM/2013/3/11/1571133911506944/1571133916446720/STEM/28b40a5bda234f3e971cfc7f3b0698ce.png)
![](https://img.xkw.com/dksih/QBM/2013/3/11/1571133911506944/1571133916446720/STEM/1eb5b0e142cc4416b676b1a9562c18dd.png)
![](https://img.xkw.com/dksih/QBM/2013/3/11/1571133911506944/1571133916446720/STEM/c7a79c12d0b6487ab308e6bd3c88c463.png)
③设
![](https://img.xkw.com/dksih/QBM/2013/3/11/1571133911506944/1571133916446720/STEM/959f70bf8eea4289b5bff0151146954f.png)
![](https://img.xkw.com/dksih/QBM/2013/3/11/1571133911506944/1571133916446720/STEM/1ab788265a8c4fa69d879c65d0ffb484.png)
![](https://img.xkw.com/dksih/QBM/2013/3/11/1571133911506944/1571133916446720/STEM/4990162d84ae4d06aa16c282762d4a05.png)
④若直线
![](https://img.xkw.com/dksih/QBM/2013/3/11/1571133911506944/1571133916446720/STEM/49c3b1be97d74734a6babf28e8176512.png)
![](https://img.xkw.com/dksih/QBM/2013/3/11/1571133911506944/1571133916446720/STEM/8c602d9512fb4c94828b96ac1259f975.png)
![](https://img.xkw.com/dksih/QBM/2013/3/11/1571133911506944/1571133916446720/STEM/7a64f0811e554a42bbf71fec5069f016.png)
其中正确命题的个数是( )
A.1 | B.2 | C.3 | D.4 |
12-13高二上·陕西西安·期末 查看更多[1]
(已下线)2012-2013学年陕西省长安一中高二上学期期末考试理科数学试卷
更新时间:2013-03-11 09:32:50
|
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【推荐1】设命题
:
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:
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
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A.![]() | B.![]() |
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【推荐2】下面四个命题正确的个数是( ).
①集合
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②若
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;
③若
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的最小值是2;
④
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①集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e09396ce60d49d7131687cdca993e9cf.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/138f6831eda71c400769fbb609f9421b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3c76b215227be58c281940c091d07f4.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d80a50645f30458ac4520670cdca06ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb49e92a2fe14d67f3079411301395ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10320f35fd2eacb18195292f2fdb54a3.png)
A.0 | B.1 | C.2 | D.3 |
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【推荐1】已知命题
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C.命题![]() |
D.命题![]() |
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真题
名校
【推荐2】下列命题为真命题的是( )
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