下列结论正确的是( )
A.命题“若![]() ![]() |
B.命题“若![]() ![]() |
C.命题“若![]() ![]() |
D.命题“若![]() ![]() |
更新时间:2019-11-12 10:39:36
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【推荐1】对任意
,
,
,给出下列命题:
①“
”是“
”的充要条件;
②“
是无理数”是“
是无理数”的充要条件;
③“
”是“
”的必要条件,
④“
”是“
”的充分条件.
其中真命题的个数为.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0097ca400d4619a94c4282c1ef6ec68e.png)
①“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f22fec5a381ae8aca93d876e54c79de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3c2c12e403e4dab34c0590455dc0ce8.png)
②“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fbb9c306da912756c1292f5a9988d91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
③“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec2349e3509799b01ce88ce91a0d7dda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34308cf92d20690e6b2745d28ea5ff5f.png)
④“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26f7c54faca6eac8af5309942062058d.png)
其中真命题的个数为.
A.1个 |
B.2个 |
C.3个 |
D.4个 |
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【推荐2】下列命题中,是假命题的是( )
A.若![]() ![]() |
B.![]() ![]() |
C.函数![]() ![]() |
D.![]() |
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【推荐1】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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【推荐2】下列说法正确的是( )
A.“若![]() ![]() ![]() ![]() |
B.若命题![]() ![]() |
C.命题![]() ![]() ![]() ![]() ![]() ![]() |
D.在![]() ![]() ![]() |
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【推荐1】下列哪个命题的逆命题为真( )
A.若![]() ![]() | B.若![]() ![]() |
C.若![]() ![]() | D.若![]() ![]() |
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【推荐2】有下列几个命题:
①“若
,则
”的否命题;
②“若
,则
,
互为相反数”的逆命题;
③“若
,则
”的逆否命题;
其中真命题的序号是( )
①“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec8201ff29a2091d40eee10db6bbc1f2.png)
②“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f1a686b80b8f109a929f58c2de7201d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
③“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0973815df3264c67f94eccde1c279ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1dbe0d4a121e1b69c2ad3b14d25d1e5.png)
其中真命题的序号是( )
A.① | B.①② |
C.②③ | D.①②③ |
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【推荐1】对于下列说法正确的是( )
A.若![]() ![]() |
B.命题“若![]() ![]() ![]() ![]() |
C.命题![]() ![]() ![]() |
D.命题“![]() |
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【推荐2】下列四个结论中正确的个数为( )
①命题“若
,则
”的逆否命题是“若
或
,则
”;②已知p:
x∈R,sin x≤1,q:若a<b,则am2<bm2,则p∧q为真命题;③命题“
x∈R,x2-x>0”的否定是“
x∈R,x2-x≤0”;④“x>2”是“x2>4”的必要不充分条件.
①命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/199e9b71bddd6f73725518ab2d567b32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58784e97e7922c90ddce0773a952c71b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da6d82d173ad18cc040e94c925b5ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6749db809dd84c2cfe5c47bea121e356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49dac463bbb7375dbf8e2246f9a6f0d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/408c3726fe0b0698826dc623f269e179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49dac463bbb7375dbf8e2246f9a6f0d9.png)
A.0个 | B.1个 | C.2个 | D.3个 |
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