名校
1 . 国家主席习近平指出:中国优秀传统文化有着丰富的哲学思想、人文精神、教化思想、道德理念等,可以为人们认识和改造世界提供有益启迪.我们要善于把弘扬优秀传统文化和发展现实文化有机统一起来,在继承中发展,在发展中继承.《九章算术》作为中国古代数学专著之一,在其“商功”篇内记载:“斜解立方,得两堑堵,斜解堑堵,其一为阳马,一为鳖臑”.刘徽注解为:“此术臑者,背节也,或曰半阳马,其形有似鳖肘,故以名云”. 鳖臑,是我国古代数学对四个面均为直角三角形的四面体的统称.在四面体
中,PA⊥平面ACB.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/24/58c3ca96-ee25-4cb8-8cc9-cb263cb93982.png?resizew=314)
(1)如图1,若D、E分别是PC、PB边的的中点,求证:DE
平面ABC;
(2)如图2,若
,垂足为C,且
,求直线PB与平面APC所成角的大小;
(3)如图2,若平面APC⊥平面BPC,求证:四面体
为鳖臑.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f44cc3030c28fdf4776b1a29c5df7c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/24/58c3ca96-ee25-4cb8-8cc9-cb263cb93982.png?resizew=314)
(1)如图1,若D、E分别是PC、PB边的的中点,求证:DE
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef336bafe4e08c983d0286c13182d81d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bf93402a48635572cbaadc2513ecd5.png)
(3)如图2,若平面APC⊥平面BPC,求证:四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f44cc3030c28fdf4776b1a29c5df7c.png)
您最近一年使用:0次
2022-10-20更新
|
143次组卷
|
2卷引用:新疆克孜勒苏柯尔克孜自治州第一中学2022-2023学年高二上学期期中数学试题
名校
2 . 如图,在四棱锥
中,底面
是菱形,
,
,
,
底面
,
,点
在棱
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/5f861a4f-d7cb-4a21-8a71-6b1bc5b4be21.png?resizew=216)
(1)证明:平面
平面
;
(2)求二面角
的余弦值.
(3)求四面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05740f0c6071846227dc0ec177ad15e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a23f01af749100e1888bba06268843db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e126c16032892966489053f44b9048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae890f9e8b32aa53a54158f24f4a87bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cc72a44dad13532cb9ddcc64bd78105.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/5f861a4f-d7cb-4a21-8a71-6b1bc5b4be21.png?resizew=216)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f04c222223dae9ef27d4c132534d9848.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5102c216393e133fa25dba98cd78535.png)
(3)求四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f178906e90bafd73e0ef9f89814855d5.png)
您最近一年使用:0次
2022-09-29更新
|
4281次组卷
|
3卷引用:新疆生产建设兵团第一师高级中学2021-2022学年高一下学期期末考试数学试题
名校
解题方法
3 . 已知三垂线定理:在平面内的一条直线和平面的一条斜线的射影垂直,则它和这条斜线垂直.请用图形语言和数学符号翻译该定理并证明.
您最近一年使用:0次
2022-11-23更新
|
94次组卷
|
5卷引用:新疆伊宁县第二中学2022-2023学年高二上学期期中考试数学(理)试题
新疆伊宁县第二中学2022-2023学年高二上学期期中考试数学(理)试题四川省遂宁中学校2022-2023学年高二上学期期中考试数学(理)试题四川省遂宁中学校2022-2023学年高二上学期期中考试数学(文)试题(已下线)10.3 直线与平面间的位置关系(第2课时)(七大题型)(分层练习)-2023-2024学年高二数学同步精品课堂(沪教版2020必修第三册)(已下线)专题03直线与平面的位置关系(4个知识点6种题型)-【倍速学习法】2023-2024学年高二数学核心知识点与常见题型通关讲解练(沪教版2020必修第三册)
名校
4 . 如图,在正方体
中,
分别是
,
的中点,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/29/982d3035-59c3-4fca-ab3e-a43c3b538ffe.png?resizew=216)
(1)求证
∥平面
;
(2)求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/29/982d3035-59c3-4fca-ab3e-a43c3b538ffe.png?resizew=216)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b4cd2b33bd983a9ed6575b9de04a46a.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
您最近一年使用:0次
解题方法
5 . 如图所示,四棱锥P-ABCD的底面ABCD为正方形,顶点P在底面上的射影为正方形的中心O,E为侧棱PC的中点,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/729fc5bb-fd2d-4319-b766-d9b8c78cebec.png?resizew=163)
(1)求证:
∥平面
(2)若
,四棱锥
的体积为
,
(i)求PA;
(ii)求PA与BE所成角的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/729fc5bb-fd2d-4319-b766-d9b8c78cebec.png?resizew=163)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080ca48cd27d4bf9d9ef084b558fc17a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/292b791c7cf21c172e6e7f97f04be176.png)
(i)求PA;
(ii)求PA与BE所成角的余弦值.
您最近一年使用:0次
名校
6 . 如图几何体中,底面
为正方形,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
平面
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/9/883c7f8b-ef70-4cd2-a7e9-b319a1c8f949.png?resizew=166)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
平面
;
(2)求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/581daa9afe1a2e08fbfc5744d396a58e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9a6e07a3ef8f3969afb82f91e6ae4ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/9/883c7f8b-ef70-4cd2-a7e9-b319a1c8f949.png?resizew=166)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/564376a88fa74090de9f7694226a6184.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
您最近一年使用:0次
21-22高二·全国·单元测试
7 . 在四棱锥P﹣ABCD中,底面ABCD是正方形,侧面PAD是正三角形,平面PAD⊥底面ABCD.
(2)求面PAD与面PDB所成的二面角的正切值.
(2)求面PAD与面PDB所成的二面角的正切值.
您最近一年使用:0次
2022-07-22更新
|
791次组卷
|
7卷引用:新疆和田地区皮山县高级中学2021-2022学年高一下学期期末考试数学试题
新疆和田地区皮山县高级中学2021-2022学年高一下学期期末考试数学试题(已下线)专题1.5 空间向量与立体几何(基础巩固卷)(已下线)立体几何专题:空间二面角的5种求法(已下线)微专题16 利用传统方法轻松搞定二面角问题(已下线)第04讲 利用几何法解决空间角和距离19种常见考法归类(3)(已下线)专题突破:线线角、线面角、二面角的几何求法盘点-同步题型分类归纳讲与练(人教A版2019必修第二册)(已下线)重难点专题14 利用传统方法解决二面角问题-【帮课堂】(苏教版2019必修第二册)
21-22高一下·浙江·期中
解题方法
8 . 如图,在棱长为2的正方体
中,M为棱
的中点,P为棱
的中点,平面
与平面
将该正方体截成三个多面体,其中N,Q分别在棱
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/1/a7c4586e-fc8e-463e-af8b-00756deb1e22.png?resizew=171)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/1/c391f71f-aa13-472b-992b-b4005e50a54e.png?resizew=171)
(1)求证:
//平面
;
(2)求证:平面
//平面
;
(3)求多面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ea5787b53322bbfd5a6300aac1b84c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/311e9cc12153a72e0b5c9290204badff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3134f4f892236d05e40a5e0c49f8df2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/1/a7c4586e-fc8e-463e-af8b-00756deb1e22.png?resizew=171)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/1/c391f71f-aa13-472b-992b-b4005e50a54e.png?resizew=171)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/311e9cc12153a72e0b5c9290204badff.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afe381b2c51738165e04edd87a14a967.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/311e9cc12153a72e0b5c9290204badff.png)
(3)求多面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeb837e11438f2cede53982203c4bd08.png)
您最近一年使用:0次
9 . 如图,在正方体
中,E,F,H,G分别是棱
,
,
,
的中点.求证:平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3be5b2da2a806e6de7f9a58b8289b6c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9fb666fcbe7f9ee9926640e91794d03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c6a3e46cd6d9508b316087d202344cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a85c632e08ce1b355808bc7a9ad9a051.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2648dd9425118c44967fd5e2b42c7899.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/573d3f133de9f6595657a128bbd2489a.png)
![](https://img.xkw.com/dksih/QBM/2022/5/9/2975671095451648/2982052824055808/STEM/6311c7ef-4c0d-4e16-89c5-cd1839518b2a.png?resizew=140)
您最近一年使用:0次
10 . 如图,在四棱锥
中,
平面
,
为
中点,__________.从①
;②
平面
.这两个条件中选一个,补充在上面问题中,并完成解答.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/b8513dd5-e39d-4ff9-bf3b-b04033cbc94a.png?resizew=172)
(1)求证:四边形
是直角梯形;
(2)求
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88d1cc93af5ec52514a759eeeb472d91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2abeb7e4413d8faefae3424083d84079.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aa1162d5481e2441fe5bc0d49a576b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/963a91995abd4927d75406d16e10a81f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/b8513dd5-e39d-4ff9-bf3b-b04033cbc94a.png?resizew=172)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc03e457c29516497914f5d5d2c38b91.png)
您最近一年使用:0次