名校
1 . 给出下列命题:①定义在
上的函数
满足
,则
一定不是
上的减函数;
②用反证法证明命题“若实数
,满足
,则
都为0”时,“假设命题的结论不成立”的叙述是“假设
都不为0”;
③把函数
的图象向右平移
个单位长度,所得到的图象的函数解析式为
;
④“
”是“函数
为奇函数”的充分不必要条件.
其中所有正确命题的序号为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3ed15aa3dcc4211fb520b5b942c989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10e8e22f77fdcc525184134ab9c8259d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3ed15aa3dcc4211fb520b5b942c989.png)
②用反证法证明命题“若实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fb20e291772c2614ad19f4cc919dfec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
③把函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30ca435490094913416be5e3749b50e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67d01e61dc0042e67b5e8ec8e727c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf36e9bbe4dc23bb02d452d38afb9d4.png)
④“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e53dcb1e01ee03b34cd5f893d377b83.png)
其中所有正确命题的序号为
您最近一年使用:0次
2017-08-22更新
|
825次组卷
|
3卷引用:江西省新余市2016-2017学年高二下学期期末质量检测数学(文)试题
2 . 用反证法证明“自然数
中至多有一个偶数”时,假设原命题不成立,等价于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
名校
3 . 用反证法证明数学命题时,首先应该做出与命题结论相反的假设,否定“自然数
中恰有一个偶数”时正确的反设为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d46d2380152e6efc40909dad0ae96c12.png)
A.自然数![]() ![]() |
B.自然数![]() ![]() |
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4 . 已知a,b,c∈(0,1),则对于(1﹣a)b,(1﹣b)c,(1﹣c)a说法正确的是
A.不能都大于![]() | B.都大于![]() | C.都小于![]() | D.至少有一个大于![]() |
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5 . 用反证法证明:在△
中,若
,则
必为锐角
![](https://img.xkw.com/dksih/QBM/2017/5/2/1678367401107456/1736573756137472/STEM/bb434420a3fe4670b8bc855bb25b6363.png?resizew=38)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19dc38d888741a1b2e95fe0773a48c38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
您最近一年使用:0次
6 . 用反证法证明命题“若
能被2整除,则
中至少有一个能被2整除”,那么反设的内容是________ .
![](https://img.xkw.com/dksih/QBM/2016/5/23/1572644593278976/1572644599070720/STEM/a9cd2dc015114338bc7b014ca176763a.png?resizew=79)
![](https://img.xkw.com/dksih/QBM/2016/5/23/1572644593278976/1572644599070720/STEM/3a50cb3cb7694aeabe042051c8cf9d97.png?resizew=27)
您最近一年使用:0次
7 . 用反证法证明“若
,则
”时,假设内容应是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a5abe56c019ac914e1fcde1865a747.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9465e247f05e925a7abf6c325890789.png)
A.![]() | B.![]() | C.![]() ![]() | D.![]() ![]() |
您最近一年使用:0次
2016-12-03更新
|
139次组卷
|
3卷引用:2014-2015学年四川省眉山市高二下学期期末理科数学试卷
11-12高二下·江西宜春·期中
8 . 已知下列四个命题:
①若函数
在
处的导数
,则它在
处有极值;
②若不论
为何值,直线
均与曲线
有公共点,则
;
③若
,则
中至少有一个不小于2;
④若命题“存在
,使得
”是假命题,则
;
以上四个命题正确的是________________ (填入相应序号).
①若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192ded2afcb5ac2f498ad84ebfd91d0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72219f070392a51a5720b826754610de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60a9a0a532d3fa4e1c17d17096965927.png)
②若不论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32d31d3dffb55d744c8078ab73e1567c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a032dd225bdd793172220c494c2054e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46d4fcb22b9ef5b847927d6d3437e024.png)
③若
![](https://img.xkw.com/dksih/QBM/2012/7/30/1570942635720704/1570942641397760/STEM/bef48533b84749aab67397b54d8d3b0a.png?resizew=293)
![](https://img.xkw.com/dksih/QBM/2012/7/30/1570942635720704/1570942641397760/STEM/e2cbd3af69044dc0a1c1577289fad479.png?resizew=60)
④若命题“存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2044ca044fd676dea926149f3a8da0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24f06633b9568b51e37fe02a645366b6.png)
以上四个命题正确的是
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