1 . 在原命题及其逆命题、否命题、逆否命题中,真命题的个数可以是( )
A.1或2或3或4 | B.0或2或4 | C.1或3 | D.0 |
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2022-07-22更新
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320次组卷
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3卷引用:陕西省榆林市府谷中学2022-2023学年高二上学期期末线上考试理科数学试题
2 . 命题“若
,则
”的否命题为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e541ea2f855f981c96207070683d388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5448b7a656d111bf61b115ce996914a.png)
A.若![]() ![]() | B.若![]() ![]() |
C.若![]() ![]() | D.若![]() ![]() |
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2022-03-13更新
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2卷引用:陕西省安康市2021-2022学年高二上学期期末文科数学试题
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3 . 给出下列三个命题:①“全等三角形的面积相等”的否命题 ②若“
,则
”的逆命题 ③“若
或
,则
”的逆否命题.其中真命题的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6f3f43eb432a24a1ac8310a6f50d2d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c6875d552e9fff3c7d655f3a59b166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a11a069688e4c797fcf527eab15afa82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c992266a05e4e5b13df198cd0d0cced.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3071b706bb1b0552d13963d2b1785192.png)
A.0 | B.1 | C.2 | D.3 |
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2022-03-04更新
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3卷引用:陕西省西安市未央区2022-2023学年高二上学期期末文科数学试题
4 . 命题“矩形的对角线相等”的否命题是________ .
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5 . 已知
,命题“若
,则
,
全为0”的否命题是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5ab4b75fa22deba7fcbcdcb31dd45b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c988d709ba8cd8aed6cb83d76c0ba89c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
A.若![]() ![]() ![]() | B.若![]() ![]() ![]() |
C.若![]() ![]() ![]() | D.若![]() ![]() ![]() |
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2022-01-17更新
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2卷引用:陕西省西安中学2022-2023学年高二上学期期中理科数学试题
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6 . 给出下列说法:
①“若
,则
”的逆命题是假命题;
②“在△ABC中,
是
的充要条件”是真命题;
③
或
是
的充分不必要条件;
④命题“若
,则
”的否命题为“若
,则
”.以上说法正确的是________ (填序号).
①“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58ab5174edcf796e06fc85e28614432f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eba75ca4ac87c18b45b5f420105f91f9.png)
②“在△ABC中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7725ad5bc8a8233f59ad3c4ccd7f465.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aa3638653a94a02420f176d860e294e.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b4ad6bf033c2de624a30b57402f9142.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4738addce8080691ea629f831fcd17fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c47201a8f3f02096fd76b6a9b22680f.png)
④命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da6d82d173ad18cc040e94c925b5ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0b051e1329de07b78b173b7980ea8ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/629507dcfdeb6866da428c4f45e2b21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6b1fc85c324b4c4defdc8f1012d9ee.png)
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7 . 下列说法正确 的是________ .
①如果命题“
”与命题“p或q”都是真命题,那么命题q一定是真命题.
②命题
,
,则
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4f1f96afc4e0091d3b781d739f25676.png)
③命题“若
,则
”的否命题是:“若
,则
”
④存在量词命题“
,使
”是真命题.
①如果命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc1bb9d53a27d484396ad74d6a26e0.png)
②命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fbaf82fe2b22d44492a001a7a02466c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1475234e2770c095dd8bec5abc957dbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19cd44731d509352f907c9773a42cab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4f1f96afc4e0091d3b781d739f25676.png)
③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/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eae9ba258299eb489b490594397e23c.png)
④存在量词命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1485a4756c56f1126b9825d5019d544c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f943ef19937b773365bfb6ca912d450.png)
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2021-11-28更新
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2卷引用:陕西省延安市富县高级中学2021-2022学年高二上学期期末理科数学试题
8 . 命题“若
,则
”的否命题是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee9f3afddf9878c2a1c7a9cbf35a0a7f.png)
A.“若![]() ![]() | B.“若![]() ![]() |
C.“若![]() ![]() | D.“若![]() ![]() |
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2021-02-05更新
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3卷引用:陕西省渭南市大荔县2020-2021学年高二下学期期末理科数学试题
9 . 下列命题中,真命题是( )
A.命题“若![]() ![]() |
B.命题“若![]() ![]() |
C.命题“当![]() ![]() |
D.命题“终边相同的角的同名三角函数值(三角函数值存在)相等”的逆否命题 |
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10 . 下列命题中为真命题的是( )
A.命题“若![]() ![]() |
B.命题“若![]() ![]() |
C.命题“若![]() ![]() ![]() |
D.命题“若![]() ![]() |
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