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1 . 给出下列四个结论:
①“
”是“函数
为奇函数”充要条件;
②若
,则
;
③“若
,则
.”的否命题是“若
,则
”;
④设
,
均为单位向量,则“
”是“
”的充要条件.
正确的命题有( )个.
①“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd68a195c5cb3c3a82d6b6e15e841571.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d473e820f4d323eeeed8202e71048074.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fce53275289a476dcffb995047133d1.png)
③“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bc1f08c7640e62e8717abf4d44a6c83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b994673c62c6370c68f688161b50ffce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bc1f08c7640e62e8717abf4d44a6c83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe62b960778048dc1f1dee7278afc65.png)
④设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683bb14ea34e04e1646511b3b2610eb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa5aa846a5b7c96fe2ce665eb1ea5f0e.png)
正确的命题有( )个.
A.1 | B.2 | C.3 | D.4 |
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2 . 原命题:“设a、b、c∈R,若a>b,则ac2>bc2”,以及它的逆命题、否命题、逆否命题中,真命题共有( )
A.0个 | B.1个 | C.2个 | D.4个 |
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2020-12-30更新
|
149次组卷
|
6卷引用:四川省邻水实验学校2020-2021学年高二上学期第三阶段考试数学(文)试题
四川省邻水实验学校2020-2021学年高二上学期第三阶段考试数学(文)试题新疆石河子第二中学2021-2022学年高二上学期第二次月考数学试题陕西省西安市高新第七高级中学2020-2021学年高二下学期期末文科数学试题(已下线)专题03+常用逻辑用语(1)(命题,充分条件与必要条件)-2020-2021学年新教材高一数学秋季辅导讲义(沪教版2020)(已下线)期末复习【真题训练】-2020-2021学年高一数学单元复习(沪教版2020必修第一册)陕西省西安市高新第七高级中学(长安区第七中学)2021-2022学年高三上学期第一次月考理科数学试题
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3 . 下列命题是真命题的是( )
A.命题“若![]() ![]() ![]() ![]() ![]() ![]() |
B.若命题![]() ![]() |
C.“![]() ![]() ![]() |
D.若命题![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
您最近一年使用:0次
2020-12-26更新
|
47次组卷
|
2卷引用:山西省长治市第二中学校2020-2021学年高二上学期第二次月考数学(理)试题
4 . 有下列四个命题:①“若
,则
,
互为倒数”的逆命题;②“面积相等的三角形全等”的否命题;③命题“若
,则
”的逆否命题;④“若
,则方程
有实数解”的逆否命题;其中真命题个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/377a2333ff8c63cbdb20b882d6d5a7ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/850f6874ea501c6021573701b0294dcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/347c62b44fae618a37c145b3b5d1f1db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5707186257494f1fea86066f2778b5.png)
A.1 | B.2 | C.3 | D.4 |
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5 . “若
且
,则
”的否命题( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cd5f68f8223717c5f9e7a35da919f60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c5c8eb10586e50bee0aad05c3a3d649.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eabd5aa2fe3a23d890841e0c6789db97.png)
A.若![]() ![]() ![]() |
B.若![]() ![]() ![]() |
C.若![]() ![]() ![]() |
D.若![]() ![]() ![]() |
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6 . 给出如下三个命题:
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“
,
”.
其中不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/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
②命题“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)
③“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96b743603ab1c10330622f16db78dbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21da825c05d5b169a5e7748f70602b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8645952ea14b25443f411d39bdec641e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/672b5ab023e451e8bb712f0be101123d.png)
其中不正确的命题的个数是( )
A.0 | B.1 | C.2 | D.3 |
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7 . 原命题是“若
则
”,则它的否命题是 ( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b20439836def79ea69d967d95e81320a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3019b662e5dc2750bb6f9199d3250f1.png)
A.若![]() ![]() | B.若![]() ![]() |
C.若![]() ![]() | D.若![]() ![]() |
您最近一年使用:0次
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8 . 命题“若
,则
或
”的否命题是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ffff645682950696c4a55ba6592e5f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8d09b9fc9719ff6faf32254b9d48713.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b945e9de74660ba3436d08aa9fa2964b.png)
A.若![]() ![]() ![]() |
B.若![]() ![]() ![]() |
C.若![]() ![]() ![]() |
D.若![]() ![]() ![]() |
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2020-12-14更新
|
148次组卷
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4卷引用:重庆市南开中学2020-2021学年高二上学期期中数学试题
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9 . 下列说法正确的是( )
A.命题“![]() |
B.命题“![]() ![]() |
C.命题“若![]() ![]() ![]() ![]() |
D.“![]() ![]() |
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2020-12-14更新
|
322次组卷
|
2卷引用:安徽省安庆七中2018-2019学年高二上学期期中数学(理)试题
名校
10 . 有关下列说法正确的是( )
A.“若函数![]() ![]() |
B.若![]() ![]() ![]() ![]() |
C.命题“若![]() ![]() ![]() ![]() ![]() ![]() |
D.若![]() ![]() ![]() |
您最近一年使用:0次