名校
解题方法
1 . 如图,在梯形
中,
,
,
,
,
与
交于点
,将
沿
翻折至
,使点
到达点
的位置.
(1)证明:
;
(2)若平面PBC与平面PBD的夹角的余弦值为
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9060f03b9ee41d70d135b1e1a8902ce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3eaa4a065f072ad5f653629a3bd7d61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68b40d0d2f3cdd8981bb792ad87efb42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acee03d4bb4667b6c345221b6c9b0fa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/bf578490-2fd9-423a-a3bf-bb9ea534308e.png?resizew=356)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5d56d8170b764b80a672cd6c861921.png)
(2)若平面PBC与平面PBD的夹角的余弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e468f168f3657d84d44be5eb89a62d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08a9ec3b527947cad9caa4537e0cb7e7.png)
您最近一年使用:0次
2023-11-06更新
|
2211次组卷
|
5卷引用:重庆市九龙坡区育才中学校2024届高三上学期第三次联考复习数学试题
重庆市九龙坡区育才中学校2024届高三上学期第三次联考复习数学试题湖南省湘东九校2024届高三上学期11月联考数学试题(已下线)考点12 空间角 2024届高考数学考点总动员【练】(已下线)专题15 立体几何解答题全归类(练习)(已下线)第三章 折叠、旋转与展开 专题一 平面图形的翻折、旋转 微点3 翻折、旋转中的基本问题(三)
名校
2 . 如图所示,四边形
为正方形,四边形
,
为两个全等的等腰梯形,
,
,
,
.
(1)当点
为线段
的中点时,求证:
;
(2)当点
在线段
上时(包含端点),求平面
和平面
的夹角的余弦值的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c197d8b99f2eb7477947e53461b5d548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed6034301fc4110da89bdb0f46ad82ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b578af6297446dfbf9fd7924b75adaef.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/31/32f66264-5281-403e-b4af-837f4af4181a.png?resizew=166)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/415adf8f49b22229ab2511dbd30c704c.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1fb7cb45ec3d67bfb57bbf5b023662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
您最近一年使用:0次
2024-01-16更新
|
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4卷引用:重庆市九龙坡区2023-2024学年高二上学期教育质量全面监测数学试题
名校
3 . 如图,在正方体
中,点E在棱
上,且
是线段
上一动点,则下列结论正确的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/dae90c42-4eaa-4a3a-abe7-4971bb29eae4.png?resizew=166)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ead6cd74c8ab04edc1cc043abb6906a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/dae90c42-4eaa-4a3a-abe7-4971bb29eae4.png?resizew=166)
A.![]() |
B.存在一点F使得![]() |
C.三棱锥![]() |
D.直线![]() ![]() ![]() |
您最近一年使用:0次
2021-01-03更新
|
731次组卷
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6卷引用:重庆实验外国语学校2021届高三下学期开学考试数学试题