1 . 下列四个命题中真命题的个数是( )
①命题“若
,则
”的否命题;
②命题“若
,则
"的逆否命题;
③命题“若
,则
”的逆命题;
④命题“
,
”的否定为“
,
"
①命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6749db809dd84c2cfe5c47bea121e356.png)
②命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd940a1fab0e50b423c879af9934e176.png)
③命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b83a660527359758db64e6566466293.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97e07ade7560a1179342ddecf4ce9dac.png)
④命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1485a4756c56f1126b9825d5019d544c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d37660096fb35820bc02bb27d58195fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c780149aef1bd77162e85f7f8906a6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d8ba7b319b94f184eda5f81101313b.png)
A.![]() | B.2个 | C.![]() | D.4个 |
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名校
2 . 已知集合
,
,则
的真子集有几个( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cdd586acd49bb71369285f84077f320.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e737623f06bd0ec8cdf505663f14cf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fdbfa7a63fdf5717d40c8c9a73ec160.png)
A.3 | B.4 | C.7 | D.8 |
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解题方法
3 . 命题p:若
,则
,命题q:在
中,若
,则
.下列命题中为真命题的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fda7aafcb05fd267ade6f8617d584ee5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca51be437b1a97ca92aa1159ab71102c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/030492644674b93e88ed864277b0ea26.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2022-03-05更新
|
103次组卷
|
2卷引用:河南省2021-2022学年高二上学期阶段性检测(三)理科数学试题
4 . 已知椭圆
,则“
”是“椭圆C的焦距是
”的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad347b76f81c6e4eb3e955c2cd85e521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e6261372802c3eea7084aa892b26c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
A.充分不必要条件 | B.必要不充分条件 |
C.充要条件 | D.既不充分也不必要条件 |
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2022-03-05更新
|
157次组卷
|
2卷引用:河南省2021-2022学年高二上学期阶段性检测(三)理科数学试题
名校
5 . 命题“
,
”的否定是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/045748e3e58bfc29cf00ea0b80d2d56b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eec0296a11f4b0ca73b7ff271ec2e79c.png)
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
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2022-03-05更新
|
212次组卷
|
3卷引用:河南省2021-2022学年高二上学期阶段性检测(三)理科数学试题
名校
6 . 设
在
内单调递增,
对任意
恒成立,则
是
的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed67742e9f3d7f8e3b411f265888f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2372f424431ce7b547a66b7d61d75421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5d3efe4ee1d1fbfd9c41a0adeede4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
A.充分不必要条件 | B.必要不充分条件 |
C.充要条件 | D.既不充分也不必要条件 |
您最近一年使用:0次
2022-02-27更新
|
648次组卷
|
2卷引用:河南省辉县市第一高级中学2021-2022学年高二上学期第二次阶段性考试数学文数试题
7 . 已知命题
,
,则
为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/053be1852c6e4c16aba9d06912f31960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd940a1fab0e50b423c879af9934e176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc1bb9d53a27d484396ad74d6a26e0.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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名校
8 . 设命题p:已知
,数列
是单调递增数列;命题q:函数
在
上的值域为
.
(1)若命题p为真命题,则求a得取值范围;
(2)若命题
为假命题,
为真命题,求实数a的取值集合A.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3a7f8bfdd161b853139a07ef9c0fe35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1c004a2255e619d8a7bee7740a294c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b04911f9626d141584495aa3d06f7e82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ead3fdcb8fe8f5eb3dbe7d96cabc28b.png)
(1)若命题p为真命题,则求a得取值范围;
(2)若命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13472bf0353e16784a22e1f890fba40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f675824e539f50cec53120959d32e554.png)
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名校
9 . 已知命题
:“
,使得
”;命题
:“
”的一个充分不必要条件是“
”,则下面命题为真命题的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2939abf9f1755ea304eeb1e73063cba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2629c30dd1923e07ce1340945c4d0cc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fbff3170097b2d504affee5a0038938.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fdbd2503adb779b32f7ceea6723970d.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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10 . 已知命题
,
,则
为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/053be1852c6e4c16aba9d06912f31960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd940a1fab0e50b423c879af9934e176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc1bb9d53a27d484396ad74d6a26e0.png)
A.![]() ![]() | B.![]() |
C.![]() | D.![]() |
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