1 . 如果对任意一个三角形,只要它的三边
都在函数
的定义域内,就有
也是某个三角形的三边长,则称
是“和美型函数”.现有下列函数:
①
;
②
;
③
;
④
.
其中是“和美型函数”的函数序号为__________________ . (写出所有正确的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b4db74fcf367ea0cd1e6ff95fed441.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6201963fcdd54887f2af50518bd908a.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2b95c7be23b95af9d091b088b808b3.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/843462e1e8566276e589a669c4703789.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6567289b18c6b3084988c4738107dcd.png)
其中是“和美型函数”的函数序号为
您最近一年使用:0次
2 . 在下列给出的命题中,所有正确命题的序号为____________ .
①若
为互斥事件,则
;
②若
,则
成等比数列;
③经过两个不同的点
、
的直线都可以用方程![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4987b682f2616cf2d3363c0409e3006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4954bf80c348915da86a442e1c912b95.png)
来表示;
④若函数
对一切
满足:
,则函数
为奇函数或偶函数;
⑤若函数
有两个不同的零点
,则
.
①若
![](https://img.xkw.com/dksih/QBM/2015/12/23/1572383539773440/1572383545827328/STEM/d36378b1a4444f95af26d11c5fa79f6e.png?resizew=32)
![](https://img.xkw.com/dksih/QBM/2015/12/23/1572383539773440/1572383545827328/STEM/45db5892819b4f02ab5b9f03edfecc2f.png?resizew=108)
②若
![](https://img.xkw.com/dksih/QBM/2015/12/23/1572383539773440/1572383545827328/STEM/7ee33a1e3fba43df9731ba4f8efe0cd4.png?resizew=51)
![](https://img.xkw.com/dksih/QBM/2015/12/23/1572383539773440/1572383545827328/STEM/94e995d0e55d4891a80f86073aef3f7c.png?resizew=40)
③经过两个不同的点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec391f08f1452fb3e0aebe7e12ba4fb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3a4422395ca20fe847419ec569e48b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4987b682f2616cf2d3363c0409e3006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4954bf80c348915da86a442e1c912b95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b41939a729cdeb8e79b9e9bd3fae11fb.png)
④若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
![](https://img.xkw.com/dksih/QBM/2015/12/23/1572383539773440/1572383545827328/STEM/140d5d745c4349fda7a8d1c68d90b7db.png?resizew=101)
![](https://img.xkw.com/dksih/QBM/2015/12/23/1572383539773440/1572383545827328/STEM/e6eda5a6e2ca480883e4177f3f1121d3.png?resizew=36)
⑤若函数
![](https://img.xkw.com/dksih/QBM/2015/12/23/1572383539773440/1572383545827328/STEM/185b8378da4a44c7997e903c715dacfa.png?resizew=137)
![](https://img.xkw.com/dksih/QBM/2015/12/23/1572383539773440/1572383545827328/STEM/6a113b06ab2b42359077821fdbb05127.png?resizew=36)
![](https://img.xkw.com/dksih/QBM/2015/12/23/1572383539773440/1572383545827328/STEM/bd596a32f8d5488fb6af21a5b7bbff70.png?resizew=60)
您最近一年使用:0次
3 . 下列说法中错误的是( )
A.先把高二年级的2000名学生编号为1到2000,再从编号为1到50的50名学生中随机抽取1名学生,其编号为![]() ![]() ![]() ![]() |
B.线性回归直线![]() ![]() |
C.若两个随机变量的线性相关性越强,则相关系数![]() |
D.若一组数据1、![]() ![]() |
您最近一年使用:0次
名校
4 . 对某同学的6次数学测试成绩进行统计,作出的茎叶图如图所示,给出关于该同学数学成绩的以下说法①中位数为84; ②众数为85;③平均数为85; ④极差为12.
其中,正确说法的序号是
![](https://img.xkw.com/dksih/QBM/2018/12/10/2093649318019072/null/STEM/b9cbc03a579c4c56b8d37487067d7ec7.png?resizew=85)
其中,正确说法的序号是
![](https://img.xkw.com/dksih/QBM/2018/12/10/2093649318019072/null/STEM/b9cbc03a579c4c56b8d37487067d7ec7.png?resizew=85)
A.①② | B.①③ | C.②④ | D.③④ |
您最近一年使用:0次
2018-12-12更新
|
446次组卷
|
6卷引用:2015-2016学年湖北省汉川市高二上学期期末理科数学试卷
名校
5 . 对某同学的7次数学测试成绩进行统计,作出的茎叶图如图所示,给出关于该同学数学成绩的以下说法:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/26/33e4e360-ec67-4aaa-88fb-caf1a53cc5b2.png?resizew=88)
①中位数为84;②众数为83;
③平均数为85;④极差为16;
其中,正确说法的序号是__________ .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/26/33e4e360-ec67-4aaa-88fb-caf1a53cc5b2.png?resizew=88)
①中位数为84;②众数为83;
③平均数为85;④极差为16;
其中,正确说法的序号是
您最近一年使用:0次
2018-02-27更新
|
401次组卷
|
2卷引用:湖北省孝感市八校2017-2018学年高二上学期期末考试数学(文)试题