1 . 命题“已知
,如果
,那么
或
”的逆否命题为_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dcbca3478eae63853d2aab5332e2e56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3e217047dfea5315242f1ebe7a87fba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f0e9c04402a0ffdaa25c3e3c82c7dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/515713922221bfa136afa32822bb7ad1.png)
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2021-08-11更新
|
430次组卷
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3卷引用:上海市嘉定区封浜高级中学2019-2020学年高一上学期期中数学试题
上海市嘉定区封浜高级中学2019-2020学年高一上学期期中数学试题(已下线)第二章 常用逻辑用语核心专项练习-【提升专练】2021-2022学年高一数学新教材同步学案+课时对点练(苏教版2019必修第一册)贵州安顺市2023届上学期高三期末数学(文)试题
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2 . 下列结论错误的是( )
A.命题“若x2﹣3x﹣4=0,则x=4”的逆否命题为“若x≠4,则x2﹣3x﹣4≠0” |
B.“x=4”是“x2﹣3x﹣4=0”的充分不必要条件 |
C.已知命题p“若m>0,则方程x2+x﹣m=0有实根”,则命题p的否定¬p为真命题 |
D.命题“若m2+n2=0,则m=0且n=0”的否命题是“若m2+n2≠0.则m≠0或n≠0” |
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3 . 命题“若
,则
”的逆否命题是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
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4 . 给出命题:“若x2+y2=0,则x=0且y=0”,写出它的逆否命题____________ .
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5 . 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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2020-04-16更新
|
341次组卷
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3卷引用:四川省绵阳南山中学实验学校2019-2020学年高二下学期开学考试数学(理)试题
6 . 命题“若
,则
或
”的逆否命题是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6749db809dd84c2cfe5c47bea121e356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da6d82d173ad18cc040e94c925b5ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
A.若![]() ![]() | B.若![]() ![]() |
C.若![]() ![]() | D.若![]() ![]() ![]() |
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7 . 给出下列三个命题:
①若
,则
或
的逆命题;
②若
,则
的逆否命题;
③若
、
,
是奇数,则
、
中一个是奇数,一个是偶数.
其中真命题的个数为( )
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1fdf7d28b97fb6fe731703f80e122ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea5977232839b54df456aeeacb13512d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c988d709ba8cd8aed6cb83d76c0ba89c.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df3b05817c655b109b9b467f3240bcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88584cf1df43e28d03592c7998b1653.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
其中真命题的个数为( )
A.![]() | B.![]() | C.![]() | D.![]() |
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8 . 下列说法错误的是( )
A.“![]() ![]() |
B.若![]() ![]() ![]() |
C.命题“若![]() ![]() ![]() ![]() |
D.若命题![]() ![]() ![]() ![]() |
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9 . 下列说法错误 的是( )
A.“若![]() ![]() ![]() |
B.“若![]() ![]() |
C.如果命题“![]() ![]() ![]() ![]() |
D.![]() ![]() |
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10 . 下列说法正确的个数是( )
①. “
”是“定义在
上函数
是奇函数”的充要条件
②. 若
:
,
,则
:
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2f0889777cab6ac15fddbdea80335d2.png)
③. “若
,则
”的逆否命题是错误的
④. 若
为假命题,则
,
均为假命题
①. “
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01bea8bf593f594c51fc7cc547482bee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
②. 若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0c7a319f1fb9ef4cd6bd9eb5ab0c53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d06720eea2022e5cc8cf1e122df7e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc1bb9d53a27d484396ad74d6a26e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c780149aef1bd77162e85f7f8906a6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2f0889777cab6ac15fddbdea80335d2.png)
③. “若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c95fa7f61564978c8e26616bc14449e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00c1fc049a87888752174ddea4187c27.png)
④. 若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13472bf0353e16784a22e1f890fba40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
A.0 | B.1 | C.2 | D.3 |
您最近一年使用:0次
2020-02-12更新
|
160次组卷
|
2卷引用:河南省驻马店市新蔡县2019-2020学年高三12月调研考试数学(理)试题