将边长为1的正方形ABCD沿对角线BD折成直二面角,若点P满足
,则
的值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0674d69c2316f6be57a3940a455c7f7.png)
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21-22高二上·山东淄博·阶段练习 查看更多[6]
山东省淄博市高青县第一中学2021-2022学年高二上学期10月月考数学试题新疆喀什莎车县第一中学2021-2022学年高二上学期期中考试数学试题重庆市第一中学2021-2022学年高二上学期11月月考数学试题福建省建瓯市芝华中学2021-2022学年高二上学期期中考试数学试题(已下线)专题 01 空间基底及综合应用(2)(已下线)专题 01 空间基底及综合应用(2)
更新时间:2021-10-27 21:27:33
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【推荐1】如图,已知平面
平面
,A,B是平面
与平面
的交线上的两个定点,
,
,且
,
,
,
,
,在平面
内有一个动点P,使得
,则
的面积的最大值是______ .
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【推荐2】已知在三棱锥
中,
平面ABC,且
,
,则三棱锥
的外接球的体积为________ .
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【推荐3】如图,矩形
所在平面与正方形
所在平面互相垂直,
,点
在线段
上.给出下列命题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/45e1bd37-d621-4b28-b4f7-2f787e36ae5c.png?resizew=188)
①直线
直线
;
②直线
与平面
所成角的正弦值的取值范围是
;
③存在点
,使得直线
平面
;
④存在点
,使得直线
平面
.
其中所有真命题的序号是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f84f169e50dc59d4f7a8e1e36f5c847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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①直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
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②直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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③存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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④存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826bf6fa3706921b77ad0eb4fcc206bd.png)
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其中所有真命题的序号是
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【推荐1】已知空间向量
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【推荐2】如图,已知二面角
的棱是
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,且
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【推荐1】如图, 二面角
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【推荐2】已知函数
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,点C为该部分图像与x轴的交点;将绘有该图像的纸片沿x轴折成直二面角,如图2所示,此时
,S是
及其内部的点构成的集合,设集合
,则T表示的区域的面积为______________
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