1 . 已知命题“若
,则
”,则它的否命题是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faf25975de678e7aeeac24d76fd5402a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae018fde08edf0539089f98c17e11ff7.png)
A.若![]() ![]() | B.若![]() ![]() |
C.若![]() ![]() | D.若![]() ![]() |
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2 . 给出如下四个命题:
①若“
且
”为假命题,则
均为假命题;
②命题“若
,则
”的否命题为“若
,则
”;
③“
,
”的否定是“
,
”;
其中正确的命题的个数是( )
①若“
![](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/d3f87fbbd5c55339ec9601ce6772ebea.png)
②命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d499e8ca8a0c2c810507e34456181577.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/630d2254e86f7983f66bfc65e7760d51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d39f63380f7f1b57b2441522692678.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d21db82627fb40877050833c5d694e5f.png)
③“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ff39e9af126fd7f909437e2a0f35324.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3acf0adb0fef5d314a104e2ce9ef9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3fe7728afebda375b4b2a001ea01965.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f45b2cfb0f60b3412991ab1996cbc9d.png)
其中正确的命题的个数是( )
A.0 | B.1 | C.2 | D.3 |
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2020-10-14更新
|
1127次组卷
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4卷引用:【全国百强校】陕西省西安市西安中学2018-2019学年高二上学期期末考试理科数学试题
3 . 给出下列四个命题:①“
”是“
”成立的必要不充分条件②命题“若
,则
”的否命题是:“若
,则
”;③命题“
,使得
”的否定是:“
,均有
”④如果命题“
”与命题“
”都是真命题,那么命题
一定是真命题;其中为真命题的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e482dd69ac1cf7f06552fdf25a217c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/200849ce71f53c0321506e27de437b8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3019b662e5dc2750bb6f9199d3250f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eae9ba258299eb489b490594397e23c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2939abf9f1755ea304eeb1e73063cba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d85685dd80e4f513558a36ccfbf21daf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ad5fe274cfc8da2dacfb65801f344ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/547adc121c442b3bb9189e6df5ee4018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc1bb9d53a27d484396ad74d6a26e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f675824e539f50cec53120959d32e554.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
A.4个 | B.3个 | C.2个 | D.1个 |
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2020-10-10更新
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4 . 若“
,则
”为原命题,则它的逆命题、否命题与逆否命题中,真命题的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1fdf7d28b97fb6fe731703f80e122ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
A.1 | B.2 | C.3 | D.0 |
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2020-08-07更新
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5 . 下列结论中,正确的是( )
A.命题“![]() ![]() |
B.若命题“![]() ![]() |
C.命题“若![]() ![]() ![]() ![]() |
D.“![]() ![]() |
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2020-05-26更新
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6 . 已知命题
若
,则
,则下列说法正确的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51441c8788ff11be766766227793246d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d217c7b12e12e5fb67472452518859ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfc5f8c0162d3a4be759b4a1d92844a7.png)
A.命题![]() |
B.命题![]() |
C.命题![]() ![]() ![]() |
D.命题![]() ![]() ![]() |
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2020-04-17更新
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7 . 下列关于命题的说法正确的是( )
A.命题“若![]() ![]() ![]() |
B.命题“若![]() ![]() ![]() ![]() |
C.命题“若![]() ![]() |
D.命题“若![]() ![]() ![]() ![]() |
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8 . 若
,则
或
的否命题是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05de5011b127d00c05186e56b4af6b21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e38581b43f437454b86dae0daed9a2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1f46f3d31d450248689fdbc7afe202.png)
A.若![]() ![]() ![]() | B.若![]() ![]() ![]() |
C.若![]() ![]() ![]() | D.若![]() ![]() ![]() |
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2020-04-06更新
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9 . 命题“若
,则
”的否命题为________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a46e678bf9d2df5ad4c782b3dc22f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b920eeb1c7e47f8cc07f66a9e210072.png)
您最近一年使用:0次
2020-03-22更新
|
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10 . 命题“若
,则
”与它的逆命题、否命题、逆否命题中,真命题的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0e6bf3a2ad91a6f8bf59442d93ea91.png)
A.0 | B.2 | C.3 | D.4 |
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2019-12-29更新
|
235次组卷
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