下列说法正确的是( )
A.若“![]() ![]() ![]() ![]() |
B.命题“若![]() ![]() ![]() ![]() |
C.命题“![]() ![]() |
D.命题“若![]() ![]() |
更新时间:2021-02-02 10:10:33
|
相似题推荐
单选题
|
较易
(0.85)
【推荐1】给出下列四个命题:①“
”是“
”成立的必要不充分条件②命题“若
,则
”的否命题是:“若
,则
”;③命题“
,使得
”的否定是:“
,均有
”④如果命题“
”与命题“
”都是真命题,那么命题
一定是真命题;其中为真命题的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e482dd69ac1cf7f06552fdf25a217c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/200849ce71f53c0321506e27de437b8d.png)
![](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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2939abf9f1755ea304eeb1e73063cba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d85685dd80e4f513558a36ccfbf21daf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ad5fe274cfc8da2dacfb65801f344ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/547adc121c442b3bb9189e6df5ee4018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc1bb9d53a27d484396ad74d6a26e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f675824e539f50cec53120959d32e554.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
A.4个 | B.3个 | C.2个 | D.1个 |
您最近一年使用:0次
单选题
|
较易
(0.85)
【推荐2】下列说法正确的是( )
A.命题“若![]() ![]() |
B.命题“若![]() ![]() |
C.不等式![]() ![]() |
D.命题“若![]() ![]() |
您最近一年使用:0次
单选题
|
较易
(0.85)
名校
【推荐1】设命题
:方程
的两根符号不同;命题
:方程
的两根之和为3,判断命题“
”、“
”、“
”、“
”为假命题的个数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9e36c6872060ddf947e85fa174c4b9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9e36c6872060ddf947e85fa174c4b9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a037d29525d118dc083dc3e5e808ca2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02475842a0c8318db41c5c38c3af7e66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a31351c3868449fd115650c13152be8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0045a603e555d2d2a8ef634f9edf9951.png)
A.0 | B.1 | C.2 | D.3 |
您最近一年使用:0次
单选题
|
较易
(0.85)
【推荐2】已知命题
若
,则
、
全为
;命题
若
,则
.给出下列四个复合命题:①
且
;②
或
;③
;④
.其中真命题的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51441c8788ff11be766766227793246d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d33a5feae8b037170a4cbd0f89345087.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/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce20ef9c08e82df8c7f45bac6dd31d36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb54b1b3617ebc502cb44194cbcd1dc.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/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc1bb9d53a27d484396ad74d6a26e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e26b38e357c7d985656ba7bb3c794a5.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
较易
(0.85)
名校
【推荐1】命题p:存在实数
,使方程
有实数根,则命题“
”是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36bcb4df710cf7fc5a4159380ae5451e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc1bb9d53a27d484396ad74d6a26e0.png)
A.存在实数![]() ![]() |
B.不存在实数![]() ![]() |
C.对任意的实数![]() ![]() |
D.至多有一个实数![]() ![]() |
您最近一年使用:0次
单选题
|
较易
(0.85)
名校
【推荐2】给出下列四个命题:
①若x∈A∩B,则x∈A或x∈B;
②∀x∈(0,+∞),都有x2>2x;
③若a,b是实数,则a>b是a2>b2的充分不必要条件;
④“∃x0∈R,x02+2>3x0”的否定是“∀x∈R,x2+2≤3x”.
其中真命题的个数是( )
①若x∈A∩B,则x∈A或x∈B;
②∀x∈(0,+∞),都有x2>2x;
③若a,b是实数,则a>b是a2>b2的充分不必要条件;
④“∃x0∈R,x02+2>3x0”的否定是“∀x∈R,x2+2≤3x”.
其中真命题的个数是( )
A.1 | B.2 | C.3 | D.4 |
您最近一年使用:0次