1 . 如图,正方体
的棱长为1,
分别为
的中点,过直线
的平面分别与棱
交于点
.设
,给出以下四个结论:
![](https://img.xkw.com/dksih/QBM/2020/7/10/2503000483315712/2503858342428673/STEM/cd1609fd1e5343b39da958d419aa65d7.png?resizew=198)
①平面
平面
;
②当且仅当
时,四边形
的面积最小;
③四边形
的周长
是单调函数;
④四棱锥
的体积是定值.
其中正确结论的序号为______ (请写出所有正确结论的序号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e86e3991200297ad172455e5ea93f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31be3b7305d6c181420ea7b28c420851.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d87dccaf9f65ef67b126e9cf94bd8694.png)
![](https://img.xkw.com/dksih/QBM/2020/7/10/2503000483315712/2503858342428673/STEM/cd1609fd1e5343b39da958d419aa65d7.png?resizew=198)
①平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c1f56858867e7b6becaeac49112a3d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2bf9ef324f1289e205e29fed105c38e.png)
②当且仅当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b650820d7bed48ed67a2869ad8c65ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65e92eac740953aa383be636ea90fd47.png)
③四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65e92eac740953aa383be636ea90fd47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a1d36150a026bbd7a16b8bc936e214.png)
④四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cb21d0d3f430f009b677eb8945323e1.png)
其中正确结论的序号为
您最近一年使用:0次
名校
2 . 关于曲线C:
,给出下列说法:
①关于坐标轴对称; ②关于点
对称;
③关于直线
对称; ④是封闭图形,面积大于
.
则其中正确说法的序号是______
注:把你认为正确的序号都填上
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9b79ffef55f4609e7d23a888e508464.png)
![](https://img.xkw.com/dksih/QBM/2018/2/5/1875664405684224/1876385973739520/STEM/add361cc393c46f4a55b6ba72df6c7a7.png?resizew=6)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b2c84e7b41a841a230ed5f8a42309aa.png)
③关于直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ebba6ed1add0fe647c0226614b9290.png)
则其中正确说法的序号是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ce8411079aca57f17d3ead32798f055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
您最近一年使用:0次
2018-02-06更新
|
424次组卷
|
2卷引用:湖北省宜昌市第一中学2017-2018学年高二上学期期末考试数学(理)试题
3 . 下列说法中,所有正确说法的序号是__________ .
①终边落在
轴上角的集合是
;
②函数
图象的一个对称中心是
;
③函数
在第一象限是增函数;
④为了得到函数
的图象,只需把函数
的图象向右平移
个单位长度.
①终边落在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96194a43ee63d8ced8a39d217cdbf170.png)
②函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d48bd08dccdb6e00cb157b0e9aebe9c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98efea05255ed7f0cfc3ac7ce2c86fec.png)
③函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fffa8ddcbbe89ab0f250f56673e2d36c.png)
④为了得到函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f66a2e26e8fb43718d82c37d2747f9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/325f9e2f7784ebdd64292e805884dfa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67d01e61dc0042e67b5e8ec8e727c22.png)
您最近一年使用:0次
2017-02-18更新
|
789次组卷
|
7卷引用:湖北省荆州市五县市区2016-2017学年高一上学期期末数学(理)试题