1 . 命题“若
,则
”的逆否命题是
![](https://img.xkw.com/dksih/QBM/2016/3/21/1572551451787264/1572551457480704/STEM/ba1710b6536544ee81ce546270518053.png)
![](https://img.xkw.com/dksih/QBM/2016/3/21/1572551451787264/1572551457480704/STEM/10d3102df8464211b8a5a8b86edb900b.png)
A.若![]() ![]() |
B.若![]() ![]() |
C.若![]() ![]() |
D.若![]() ![]() |
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2 . 下列命题正确的是
A.若![]() ![]() ![]() ![]() ![]() ![]() |
B.若![]() ![]() ![]() ![]() |
C.命题![]() ![]() ![]() ![]() |
D.命题“若![]() ![]() ![]() ![]() |
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3 . 命题“如果
都是奇数,那么
是偶数”的逆否命题是____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
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4 . 下列语句是命题的是
A.![]() | B.![]() | C.集合与简易逻辑 | D.真子集 |
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5 . “若a>b,则
”的逆否命题为________ .
![](https://img.xkw.com/dksih/QBM/2015/12/17/1572368410738688/1572368416415744/STEM/0456e65ee9864824ab37fd429247369a.png?resizew=52)
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6 . 下列命题中是假命题的是
A.![]() ![]() ![]() |
B.函数![]() ![]() ![]() ![]() |
C.关于![]() ![]() ![]() |
D.函数![]() ![]() ![]() |
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名校
7 . 命题“若
是偶数,则
都是偶数”的否命题是:_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
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2016-12-03更新
|
505次组卷
|
2卷引用:2015-2016学年广西桂林中学高二上期中考试文科数学试卷
8 . 已知命题:“若
,则
”则原命题、逆命题、否命题、逆否命题这四个命题中,真命题的个数是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1851d61e96bafb305197cb56e18d7c6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3235f5e7a56f6b2799ca97383f2301bb.png)
A.0 | B.1 | C.2 | D.4 |
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9 . 命题“若实数a满足a≤2,则a2<4”的否命题是______ (填“真”或“假”)命题.
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10 . 给出下列四个命题:
①若
,则
;
②若
,则
;
③若正整数
满足
,则
;
④若
,且
,则
.
其中真命题的序号是________ .(请把真命题的序号都填上)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a46e678bf9d2df5ad4c782b3dc22f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd851caf97d430a0c7d7ecd64871dd98.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d920abc4b08097b2fe7a54164829315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9917f07000b4a222dc6bbcf740ccd94.png)
③若正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb7961cbe98aac6a5fdee94582c341b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ccacae30e27a9cf8a41d4fa7f5177f7.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e30c903d8f8a05332af0b19e7e40df3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de7709ba26600bca498a6f086c480f8f.png)
其中真命题的序号是
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