命题“
,使得
”的否定形式是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc9b82e9a5b043ddeb7c5acdc9d596c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d211a4622ec9694102c4591f829f97be.png)
A.![]() ![]() ![]() |
B.![]() ![]() ![]() |
C.![]() ![]() ![]() |
D.![]() ![]() ![]() |
2019高二上·全国·专题练习 查看更多[2]
更新时间:2019-01-08 19:13:13
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【知识点】 全称命题的否定及其真假判断解读
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【推荐2】给出下列四个命题:①若“
且
”为假命题,则
﹑
均为假命题;②三角形的内角是第一象限角或第二象限角;③若命题
,
,则命题
,
;④设集合
,
,则“
”是“
”的必要条件;其中正确命题的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fbaf82fe2b22d44492a001a7a02466c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15479f170d8b52991ce14d5c4fe966a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19cd44731d509352f907c9773a42cab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d8ba7b319b94f184eda5f81101313b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef00a6175f40f72115cd86bc994420b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21cb93ee5f6764da3884c83a2682b0fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed006b944ea64f970fee46e2f558467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23af61cd402b3789af2401bde9cbefe.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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