名校
1 . 已知原命题的逆命题是:“若
,则
”,试判断原命题的否命题的真假________ .(填“真”或“假”)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34715101c66fa12ce6baf0a9c53f1672.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c988d709ba8cd8aed6cb83d76c0ba89c.png)
您最近一年使用:0次
2020-03-02更新
|
144次组卷
|
3卷引用:四川省雅安市芦山县芦山中学2020-2021学年高二下学期期中数学理科试题
2 . 下列4个命题:
①“若
成等比数列,则
”的逆命题;
②“如果
,则
”的否命题;
③在
中,“若
”则“
”的逆否命题;
④当
时,若
对
恒成立,则
的取值范围是
.
其中真命题的序号是__________ .
①“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eecf783b0385c573f96e497f7399d038.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1c8379fe535e68721fd84be969d257f.png)
②“如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a566ee5d2d5029fe2b63838ede01cecb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c0aa2ef928b6e3341d0a0dc6d8055b9.png)
③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)
④当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9c89eab34f319912ed5efb3f6f4592c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b47b356d21713e8956a6d8791144423.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ff39e9af126fd7f909437e2a0f35324.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa79d0700ed2cf5418f2cd4f2a371922.png)
其中真命题的序号是
您最近一年使用:0次
11-12高二下·四川雅安·期中
3 . 有下列4个命题:
①、函数
在一点的导数值为
是函数
在这点取极值的充要条件;
②、若椭圆
的离心率为
,则它的长半轴长为1;
③、对于
上可导的任意函数
,若满足
,则必有![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f8f1e16cc3e79d4286d373a923cd228.png)
④、经过点(1,1)的直线,必与椭圆
有2个不同的交点.其中真命题的为_____
将你认为是真命题的序号都填上)
①、函数
![](https://img.xkw.com/dksih/QBM/2012/7/19/1570929760952320/1570929766400000/STEM/a49563b2585c430d80a65218f1c1f149.png?resizew=61)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://img.xkw.com/dksih/QBM/2012/7/19/1570929760952320/1570929766400000/STEM/a49563b2585c430d80a65218f1c1f149.png?resizew=61)
②、若椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12d6977d77fef25921ecd3da10cbc43c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
③、对于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bebefcdc13193b5aabaa8ab5a3c964e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f8f1e16cc3e79d4286d373a923cd228.png)
④、经过点(1,1)的直线,必与椭圆
![](https://img.xkw.com/dksih/QBM/2012/7/19/1570929760952320/1570929766400000/STEM/4f316581a3084507b132e7ec0a0f619a.png?resizew=81)
将你认为是真命题的序号都填上)
您最近一年使用:0次
12-13高二上·吉林·期末
名校
4 . 命题:“若
不为零,则
都不为零”的逆否命题是____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18f0281e6bbdbe08beeccb55adf84536.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
您最近一年使用:0次