1 . 给出以下命题:
(1)
,
;(2)
,
;(3)有些自然数是偶数;
(4)
,
;(5)
是
的充分不必要条件;
(6)符合条件
集合
有4个;
其中真命题的个数为( )
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ee09b14494ad377b52cd9ed8e2b6f40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8034dddd265a186e29172623e3b9eadf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ad5fe274cfc8da2dacfb65801f344ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c461d76fce244455f2a06b866f8ba500.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ccd7af9298cd5ff19d8866fedb42ec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3ef6ac3a5f1358143e94eb31f6687d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047056c99b39c70fa40d3c8178e5b631.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ada1ccce7a29845fe2f77cf916f9f5c.png)
(6)符合条件
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf57fc3f6af905b57688d829d15eb3bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
其中真命题的个数为( )
A.1个 | B.3个 | C.4个 | D.6个 |
您最近一年使用:0次
2022-10-11更新
|
209次组卷
|
2卷引用:北京市首都师范大学附属密云中学2022-2023学年高一上学期10月月考数学试题
12-13高三上·江西抚州·期末
解题方法
2 . 下列命题中,正确的是___________ .(写出所有正确命题的编号)
①在
中,
是
的充要条件;
②函数
的最大值是
;
③若命题“
,使得
”是假命题,则
;
④若函数
,
,则函数
在区间
内必有零点.
①在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca51be437b1a97ca92aa1159ab71102c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19dc38d888741a1b2e95fe0773a48c38.png)
②函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a7dbfd2c21019aa2b023b063d05f12f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbdf7979741a56ddd09cf18990555cb.png)
③若命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1485a4756c56f1126b9825d5019d544c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8918665ea876fdf401835dd536b9bf19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e6c8a161274b6bdbe854d6f6636e53b.png)
④若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8ee0bd8a541d6c1057325f7f4287a64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/066e7701f06030b395f4de4bd13bc90a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b094cba781181aeb90752170e9ba6c94.png)
您最近一年使用:0次
3 . 下列说法正确的是( )
A.“![]() ![]() ![]() ![]() |
B.若![]() ![]() ![]() ![]() |
C.两个非零向量![]() ![]() ![]() ![]() ![]() |
D.若![]() ![]() ![]() ![]() |
您最近一年使用:0次