1 . “若整数a不能被2整除,则a是奇数”的否命题是______ .
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2 . 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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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 . 下述四个结论:
①命题“若
,则
”的否命题是“若
,则
”;
②
是
的必要而不充分条件;
③若命题“
”与命题“p或q”都是真命题,则命题q一定是真命题;
④命题“
,
”的否定是“
,
”.
其中所有正确结论的序号是( )
①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/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eae9ba258299eb489b490594397e23c.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bfcffd48bd96e513072d998b69b6629.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c6875d552e9fff3c7d655f3a59b166.png)
③若命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc1bb9d53a27d484396ad74d6a26e0.png)
④命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/422cb62ad7fa8fdd0e8aeeea7011e06b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed3b92dce0908f398f1e2a924c0a72a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72fa139aad70ad1ac124affc3fe5d75c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eaf63697e471166a52f2a04c6b4276b.png)
其中所有正确结论的序号是( )
A.①② | B.②③ | C.④ | D.②③④ |
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3卷引用:河南省省直辖县级行政单位济源市2022-2023学年高二上学期期末数学理科试题
6 . 下列命题中,真命题是( )
A.命题“若a>b,则ac2>bc2” |
B.命题“若a=b,则|a|=|b|”的逆命题 |
C.命题“当![]() |
D.命题“终边相同的角的同名三角函数值相等”的逆否命题 |
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7 . 已知原命题:“若x<-2,则
”,则逆命题,否命题,逆否命题中,真命题的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bb9bace43ea5e7cb4de694b1765e92b.png)
A.0 | B.1 | C.2 | D.3 |
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8 . 已知命题
:若
,则
,在命题
与其逆命题、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/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c2c6eb4744f332ee2bbf938f5e1c683.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7554ce3846def06c3b1a24936c96eaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
A.0 | B.2 | C.3 | D.4 |
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9 . 下列命题正确的是_________ .(填入序号)
①若命题p为假命题,命题q是真命题,则
为真命题.
②命题“若
与
的夹角为锐角,则
”及它的逆命题均为真命题.
③命题“若
,则
或
”的逆否命题为“若
且
,则
”.
①若命题p为假命题,命题q是真命题,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b68befa27a996e2b6543eaf7e36b0091.png)
②命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdbc0945b4e1962e66f6f7e7f6af235d.png)
③命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d905b0b228d2ddb95cf128de5002eedc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45f673c56a289ea78831c9237e8d20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c6875d552e9fff3c7d655f3a59b166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f0e9c04402a0ffdaa25c3e3c82c7dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31be670d32e753012125c503f2f3be56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb3e3f3a5ee26b44931b0b1a5b4723e3.png)
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10 . 下面命题正确的是( )
A.“若![]() ![]() |
B.命题“若任意的![]() ![]() ![]() ![]() |
C.设![]() ![]() ![]() ![]() |
D.设![]() ![]() ![]() |
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