1 . 给出下列四个命题:①“若
,则a>b”的逆命题;②“
,使得
”的否定;③已知函数
的图象向右平移
个单位长度后得到函数
的图象,“函数
为偶函数”的充要条件是“
”;④在
中,“
”是“
”的充分不必要条件.其中为真命题的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c22b9d08cf536bbb76bce1b0f135772.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2939abf9f1755ea304eeb1e73063cba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5cb4f9a54a37fa2cf503bc77eb67ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1460e4a1178391ab692aa0af66b915b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e9f49332bd7f58d3efb1035109e520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbb60c8c689819d191bb1aebd622b98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9146192606b1abda29b88e60542e70e.png)
A.②④ | B.①④ | C.③④ | D.②③ |
您最近一年使用:0次
2023-02-16更新
|
135次组卷
|
5卷引用:内蒙古自治区兴安盟乌兰浩特市第四中学2022-2023学年高二上学期期中数学试题
2 . 给出下列四个结论:
①命题“若
,则方程
有实数根”的逆否命题为:“若方程
没有实数根,则
”
②若
,
,
,则
的最小值为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
③函数
的定义域为
的充要条件是![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe9e329f2730b2be926b121f1ae04c0f.png)
④对于函数
,则
,使得函数
在
上有三个零点
其中正确结论的个数为( )
①命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac671e6d87de2fb5f7ad3aab582866d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac671e6d87de2fb5f7ad3aab582866d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a878fd5a7104a7f42770a19097d56457.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12b40b1544e62be8b9e9f4dc9f2c0c74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f7266b2ef457b8ddeee3fa2cc24022e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
③函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8adf8ed71879a057c00b613a6160414d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe9e329f2730b2be926b121f1ae04c0f.png)
④对于函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c57d66efe78a5722434d664bbd6c8556.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b011ee87e2b692e20ab61d903b006fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b643958a140baa5f2e706d0bec88070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
其中正确结论的个数为( )
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
3 . (1)若
或
,则
.写出其逆命题、否命题、逆否命题,并分别指出真假;
(2)设原命题是:当c>0时,若a>b,则ac>bc,写出其逆命题、否命题、逆否命题,并分别指出真假.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a878fd5a7104a7f42770a19097d56457.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6bdfc6e53ec0af4942365bb570c6741.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dff3ece45bf6c91d9dd8d07ae72584d.png)
(2)设原命题是:当c>0时,若a>b,则ac>bc,写出其逆命题、否命题、逆否命题,并分别指出真假.
您最近一年使用:0次