1 . 下列五个命题:
①命题“若
,则
”的否命题是“若
,则
”;
②若命题
:
,
,则
:
,
;
③若命题“
”与命题“
或
”都是真命题,则命题
一定是真命题;
④命题“若
,则
”是真命题;
⑤命题“集合
有
个子集”是假命题.其中正确命题的序号是( )
①命题“若
![](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/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eae9ba258299eb489b490594397e23c.png)
②若命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8645952ea14b25443f411d39bdec641e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/264dab145ceba44696a6ee63b1e1549d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc1bb9d53a27d484396ad74d6a26e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96b743603ab1c10330622f16db78dbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba1c77d129b56255baf3d76eb2a6c2ff.png)
③若命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc1bb9d53a27d484396ad74d6a26e0.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/9aa8a716a31b0f51b70fdf9bdb257909.png)
④命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7326ea56be82bd616fec7e6aa3c884c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a17252a7d726172192959c61e97a6251.png)
⑤命题“集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30ff164ece9ff547f1d1b8a827240fac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
A.②③ | B.①② | C.④⑤ | D.③④ |
您最近一年使用:0次
名校
2 . 命题“如果
,那么
”的否命题是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c0aa2ef928b6e3341d0a0dc6d8055b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27f27cbb8185c1974d715ff95f8801c.png)
您最近一年使用:0次
2021-11-17更新
|
289次组卷
|
4卷引用:河南省新蔡县第一高级中学2021-2022学年高二上学期11月月考数学(理科)试题
名校
3 . 下列命题中不正确的是( )
A.若命题p为真命题,命题q为假命题,则命题“p∨(¬q)”为真命题 |
B.命题“若a+b≠7,则a≠2且b≠5”为真命题 |
C.命题“若x2﹣x=0,则x=0或x=1”的否命题为“若x2﹣x≠0,则x≠0且x≠1” |
D.命题p:∃x>0,sinx>2x﹣1,则¬p:∀x>0,sinx≤2x﹣1 |
您最近一年使用:0次
2021-10-06更新
|
362次组卷
|
3卷引用:河南省南阳市第一中学校2021-2022学年高二上学期第三次月考数学(理)试题
20-21高二下·浙江·期末
名校
4 . 下列命题为真命题的是( )
A.命题“若![]() ![]() |
B.命题“若![]() ![]() |
C.命题“若![]() ![]() |
D.命题“若![]() ![]() |
您最近一年使用:0次
2021-04-16更新
|
433次组卷
|
7卷引用:河南省南阳市六校2020-2021学年上学期第二次联考高二年级数学试题
5 . 下列有关命题的说法正确的是( )
A.命题“若![]() ![]() |
B.命题“若![]() ![]() |
C.![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
D.命题“到两个定点的距离之和为定值的点的轨迹是椭圆”的逆命题是真命题 |
您最近一年使用:0次
名校
6 . 现有下列说法:
①若
,则
;
②若
,则
;
③命题“若
,则
”的否命题是“若
,则
”.
其中正确说法的个数为( )
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f1a686b80b8f109a929f58c2de7201d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c056533d8fae45010f84b64ee55628f0.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43f251e3e87ae5c4edbee44ecf394ee4.png)
③命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b767c33d36acbb9b5110ad0652237652.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f40dc05076a00bc94b3a8b6f8451a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b767c33d36acbb9b5110ad0652237652.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd4ddfef3a45e617cdad2b9172fbdc3e.png)
其中正确说法的个数为( )
A.0 | B.1 | C.2 | D.3 |
您最近一年使用:0次
2021-02-04更新
|
301次组卷
|
3卷引用:河南省新乡市2020-2021学年高二上学期期末数学文科试题
7 . 下列说法中,正确的是( )
A.若命题“非![]() ![]() ![]() ![]() |
B.命题“存在![]() ![]() ![]() ![]() |
C.命题“若![]() ![]() ![]() ![]() |
D.“![]() ![]() |
您最近一年使用:0次
8 . 命题“若
,则
”的否命题是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55aa0a20848c37c1892c567b2315e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3ba338ee0ef6b08754fc1b1225ba514.png)
A.若![]() ![]() | B.若![]() ![]() |
C.若![]() ![]() | D.若![]() ![]() |
您最近一年使用:0次
2021-01-27更新
|
202次组卷
|
3卷引用:河南省三门峡市2020-2021学年高二上学期期末数学(理科)试题
9 . 命题“若
是等比数列,对于任意
,
,
,
”及其逆命题、否命题与逆否命题中,假命题的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52eecd38954cd0ca3fb26328a39bb859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b08c58baacec3cd0c0a06e267fa9ec5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c3b2e73ab90c9d7af8aa7da0c2b628b.png)
A.4 | B.2 | C.1 | D.0 |
您最近一年使用:0次
10 . 已知原命题为“若
,则
”,则原命题、逆命题、否命题、逆否命题这四个命题中,真命题的个数是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78e5a67533573ddea2d4a966aa01203d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5de84139b02162d7a82ad983c22a832.png)
您最近一年使用:0次
2020-12-30更新
|
117次组卷
|
2卷引用:河南省南阳市2020-2021学年高二上学期12月月考数学(文)试题