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1 . 下列说法中,正确的是( )
A.命题“若![]() ![]() ![]() |
B.命题“若![]() ![]() ![]() ![]() |
C.命题“若![]() ![]() ![]() ![]() ![]() |
D.若命题p:![]() ![]() ![]() |
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2 . 命题“若
,则
或
”的否命题是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25339da44bf61bf1c130f5f23e565018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bc1807f5f5784e75c4e5e6df17f3ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88c2c4b82d87e769807270fc5361fde3.png)
A.若![]() ![]() ![]() | B.若![]() ![]() ![]() |
C.若![]() ![]() ![]() | D.若![]() ![]() ![]() |
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3 . 下列命题中正确的是___________ .(填写序号)
(1)“若
,则
”的逆否命题为:“若
,则
”.(2)若命题
为真命题,命题
为假命题,则命题“
”为真命题.(3).“
”是“
”的充要条件.(4).命题“若
,则
”的否命题为:“若
,则
”.(5).抛掷一枚质地均匀骰子,“结果出现5点”的事件与“结果出现6点”的事件互为对立事件
(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/0e30c903d8f8a05332af0b19e7e40df3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a8a2a94168af9b16ce89271a5d8dc6b.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/f675824e539f50cec53120959d32e554.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00c1fc049a87888752174ddea4187c27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f96144368b1b5ca55648a797580f022e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34715101c66fa12ce6baf0a9c53f1672.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45f673c56a289ea78831c9237e8d20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34715101c66fa12ce6baf0a9c53f1672.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f0e9c04402a0ffdaa25c3e3c82c7dd.png)
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4 . 给定下列命题:①若
,则方程
有实数根;②“若
,则
或
”;③“矩形的对角线相等”的逆命题;④“若
,则x,y中至少有一个为0”的否命题.其中真命题的序号是_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0d68648b10fce54dfc19c5ee60086d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abea6224022b1908702d845fb4759f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca42301f789282952f4f8f2433c17076.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8d09b9fc9719ff6faf32254b9d48713.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed6f12ee54d72aebccd5a0444fdec8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34715101c66fa12ce6baf0a9c53f1672.png)
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5 . 已知命题“若
是偶数,则
都是偶数”,则该命题的逆命题、否命题、逆否命题3个命题中,真命题的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
A.3 | B.2 | C.1 | D.0 |
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2022-12-06更新
|
91次组卷
|
2卷引用:宁夏银川市贺兰县景博中学2022-2023学年高二上学期第二次月考数学(理)试题
6 . 命题“若
,则
且
”的否命题为______________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8635af7bc505301a16eb3bbccdc86e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8d09b9fc9719ff6faf32254b9d48713.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abc335ee14fc0b1130900cb82bcb3061.png)
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7 . 下列命题:
①若
,则
;
②“在
中,若
,则
”的逆命题是真命题;
③命题“
,
”的否定是“
,
”;
④“若
,则
”的否命题为“若
,则
”.
则其中正确的是______ .
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26f7c54faca6eac8af5309942062058d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2128a00f52af4427721f0ebba591daa.png)
②“在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19dc38d888741a1b2e95fe0773a48c38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca51be437b1a97ca92aa1159ab71102c.png)
③命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1485a4756c56f1126b9825d5019d544c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3aaa2a2d80fae904461d89ca8fa1f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96b743603ab1c10330622f16db78dbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fc6252b12df14414d6ebfe03749b4b5.png)
④“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdbb2015f2be55935cb9e48d967190df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3798d6c2e5eac9c1d8b044efd5081acf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd489150af4efdecc3489b7af74ce3d3.png)
则其中正确的是
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2021-12-25更新
|
580次组卷
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3卷引用:宁夏青铜峡市高级中学2021-2022学年高二上学期期末考试数学(文)试题
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8 . 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![]() ![]() |
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2021-11-30更新
|
368次组卷
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2卷引用:宁夏六盘山高级中学2021-2022学年高二(资助班)上学期期中考试数学(理)试题
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9 . 下列有关命题的说法正确的是( )
A.命题“若![]() ![]() ![]() ![]() |
B.“若![]() |
C.“若![]() ![]() ![]() ![]() |
D.命题“存在![]() ![]() ![]() ![]() |
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10 . 下列说法正确的是( )
A.命题“若![]() ![]() ![]() ![]() |
B.![]() ![]() ![]() |
C.命题“若![]() ![]() |
D.已知![]() ![]() ![]() |
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