名校
解题方法
1 . 如图所示,在四棱锥P﹣ABCD中,BC∥平面PAD,
,E是PD的中点.
(2)求证:CE∥平面PAB.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e306e30d3159e4a68435c3fcfc8da693.png)
(2)求证:CE∥平面PAB.
您最近一年使用:0次
2023-04-20更新
|
4961次组卷
|
29卷引用:北京市第二十四中学2021-2022学年高一下学期期中考试数学试卷
北京市第二十四中学2021-2022学年高一下学期期中考试数学试卷北京市第二十四中学2021-2022学年高一下学期期中考试数学试卷宁夏六盘山市高级中学2020-2021学年高一上学期期末考试数学试题(已下线)8.5空间直线、平面的平行(精炼)-2020-2021学年高一数学一隅三反系列(人教A版2019必修第二册)天津市芦台一中、静海一中、蓟州一中、杨村一中等七校2020-2021学年高一下学期期中联考数学试题广东省深圳市宝安中学2020-2021学年高一下学期期中数学试题江苏省盐城市伍佑中学2020-2021学年高一下学期期中数学试题福建省莆田第五中学2020-2021学年高一下学期数学期中测试题江苏省无锡市第六高级中学2020-2021学年高一下学期期中数学试题陕西省宝鸡市陈仓区2021-2022学年高一上学期期末数学试题广东省化州市第三中学2020-2021学年高一下学期期中数学试题广东省广州市白云中学2021-2022学年高一下学期期中数学试题江西省赣州市第三中学2021-2022学年高一下学期期中考试数学试题天津市耀华嘉诚国际中学2021-2022学年高一下学期期中数学试题河南省濮阳市2021-2022学年高一下学期数学期中考试试题苏教版(2019) 必修第二册 过关斩将 第13章 专题强化练3 直线与平面的位置关系四川省遂宁市射洪中学校2022-2023学年高二上学期第一次学月考试数学(文科)试题重点题型训练13:第6章平行关系、垂直关系-2020-2021学年北师大版(2019)高中数学必修第二册(已下线)第八章:立体几何初步 重点题型复习(2)宁夏银川市贺兰县第一中学2022-2023学年高一下学期期中考试数学试题宁夏银川市贺兰县第一中学2022-2023学年高一下学期期末考试数学试题江苏省淮安市涟水县第一中学2022-2023学年高一下学期5月第二次月考数学试题(已下线)第七章 立体几何与空间向量 第三节?第一课时直线,平面平行的判定与性质(A素养养成卷)(已下线)专题18 直线与直线平行 直线与平面平行-《重难点题型·高分突破》(人教A版2019必修第二册)(已下线)第八章立体几何初步(单元测试)-【上好课】-(人教A版2019必修第二册)广东省广州市增城中学2023-2024学年高一下学期期中数学试题(已下线)专题19 直线与平面的位置关系-《重难点题型·高分突破》(苏教版2019必修第二册)(已下线)11.3.1&11.3.2 平行直线与异面直线、直线与平面平行-【帮课堂】(人教B版2019必修第四册)广东省深圳市龙岗区平湖外国语学校2023-2024学年高一下学期期中考试数学试题
名校
解题方法
2 . 如图,四棱锥
的底面为菱形,
,
,
底面
,
,
分别是线段
,
的中点,
是线段
上的一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/995042db-ddac-4478-a675-e326cde38a77.png?resizew=142)
(1)若
平面
,求证:
为
的中点;
(2)若
是直线
与平面
的交点,试确定
的值;
(3)若直线
与平面
所成角的正弦值为
,求三棱锥
体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff5a86745bfe1dfe7bc2683811210330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9b5d2943803894bc5d204e75e2d172b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/995042db-ddac-4478-a675-e326cde38a77.png?resizew=142)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dace90bcafd1fbf25f272b05c3875f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe8a84ca3a13f82aff1a022edc66065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b544c9dfc27b50fcde4b12d694c12ad4.png)
(3)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9bbc7e0de28c652ae10a8db5b4e2687.png)
您最近一年使用:0次
解题方法
3 . 已知正方体
,点E为
中点,直线
交平面
于点F.求证:点F为
中点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/12/e1e9fa42-0642-4c70-a59e-ec9ebc768047.png?resizew=177)
您最近一年使用:0次
2023-04-12更新
|
331次组卷
|
3卷引用:北京市景山学校远洋分校2021-2022学年高二上学期第一次月考数学试题
北京市景山学校远洋分校2021-2022学年高二上学期第一次月考数学试题第六章 立体几何初步 基础知识练习题——2021-2022学年高一下学期数学北师大版(2019)必修第二册(已下线)第05讲 空间直线﹑平面的平行-《知识解读·题型专练》
解题方法
4 . 如图,在长方体
中,
,
,E是
的中点,平面
与棱
相交于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/12/2e0df4c5-71a3-47d0-b521-0264ca1dd311.png?resizew=192)
(1)求证:点F为
的中点;
(2)若点G为棱
上一点,且
,求点G到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6155f82a6f64b20085976cea9b64193.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/12/2e0df4c5-71a3-47d0-b521-0264ca1dd311.png?resizew=192)
(1)求证:点F为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
(2)若点G为棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b759a84945de16569fdee1b97ad09b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
您最近一年使用:0次
5 . 如图,在四棱锥
中,底面
为正方形,平面
平面
,点
在线段
上,
∥平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/251999d1-7d92-4668-8508-8b87948de17e.png?resizew=251)
(1)求证:
为
的中点;
(2)求平面
与平面
所成角的大小.
![](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/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33b05d9236a72555e4b0ceaa02ace108.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/251999d1-7d92-4668-8508-8b87948de17e.png?resizew=251)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
您最近一年使用:0次
解题方法
6 . 如图,四棱锥
中,侧面
平面
,
,
,
.点
为棱
的中点,平面
与棱
相交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/6/fe57b655-7858-466a-aeeb-14a7830994f7.png?resizew=206)
(1)求证:
为
中点;
(2)再从条件①、条件②这两个条件中选择一个作为已知,求二面角
的大小.
条件①:
;
条件②:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4299cca48ff6abfb252ef73b5e62317d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87261df80b82221732329b6ef3fdda7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83b76a280fc562446ee8ddd2d6bf1d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb58ca76c1fb28b4cb408bb9897b70a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/6/fe57b655-7858-466a-aeeb-14a7830994f7.png?resizew=206)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
(2)再从条件①、条件②这两个条件中选择一个作为已知,求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47d294d69caac577339f11f477b2047e.png)
条件①:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90da62f1614568a0b1e5e47ea85e7e3c.png)
条件②:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed66431681da1db8f7cb0f40cd19201.png)
您最近一年使用:0次
名校
解题方法
7 . 在四棱锥
中,
平面
为棱
中点,
,
,再从条件①、条件②这两个条件中选择一个作为已知.
条件①:
;
条件②:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/b15170fd-4950-4d8f-a0ea-2d60922e0aaf.png?resizew=215)
(1).求证:
;
(2).求直线
与平面
所成角的正弦值.
![](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/23d11e19c84255eb0431415c2dec553d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8eb7be08ab924bd4e6360633e4ab383.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1720da6d65e7fa854d98322d3864240.png)
条件①:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06201e4f55b78d8b30afb257d5a1b16b.png)
条件②:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/b15170fd-4950-4d8f-a0ea-2d60922e0aaf.png?resizew=215)
(1).求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd6a2b112facda441f4e34bf5c145fa.png)
(2).求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
您最近一年使用:0次
2022-12-04更新
|
396次组卷
|
4卷引用:北京市十一学校2023届高三上学期12月月考数学试题
北京市十一学校2023届高三上学期12月月考数学试题北京市十一学校2023届高三上学期11月月考数学试题云南省楚雄市实验中学2023届高三上学期第三次测试数学试题(已下线)技巧04 结构不良问题解题策略(精讲精练)-1
名校
8 . 如图,在三棱柱
中,四边形
是边长为4的菱形,
,点D为棱AC上动点(不与A,C重合),平面
与棱
交于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/23/d24c04ce-db04-4e92-8d11-2c9457388807.png?resizew=216)
(1)求证:
;
(2)若
,从条件①、条件②、条件③这三个条件中选择两个条件作为已知,求直线AB与平面
所成角的正弦值.条件①:平面
平面
;条件②:
;条件③:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36cf3bff56a7f4ab6c0008e90823025d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/445cfd832967db6bbaa0a2ea311b4f0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0f31a48422525cb066a51b5b6a6673e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a81eb09967a29554c7476e02eae551c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b10b969819d397711310c8dbb399ebc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/23/d24c04ce-db04-4e92-8d11-2c9457388807.png?resizew=216)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/271bf95761d1cc26b4106214f4166af5.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f085f65b6f426a24b1653dbfec7d70c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c6ca194414a76b40f936e097c504e75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c0b2a4616dbc8c104bbb1cf9ec211d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/445cfd832967db6bbaa0a2ea311b4f0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a4625ece44b3a06dc5968e71e1870e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc7e2ffe38421dbaf2b7658cafc6dbe.png)
您最近一年使用:0次
2022-10-20更新
|
2786次组卷
|
15卷引用:北京市西城区2022届高三二模数学试题
北京市西城区2022届高三二模数学试题北京市昌平区第二中学2022-2023学年高二上学期10月月考数学试题北京市第五十七中学2022-2023学年高二上学期10月月考数学试题北京市东城区2023届高三一模数学试题查漏补缺练习试题(2)(已下线)2022年新高考北京数学高考真题变式题9-12题空间向量与立体几何中的高考新题型(已下线)2022年新高考北京数学高考真题变式题16-18题全国大联考2023届高三第四次联考数学试卷(已下线)专题8-2 立体几何中的角和距离问题(含探索性问题)-3(已下线)北京市西城区2022届高三二模数学试题变式题16-21(已下线)模块十一 立体几何-2重庆市第八中学校2022届高三下学期高考考前模拟数学试题(已下线)模块六 专题8 易错题目重组卷(重庆卷)陕西省延安市宜川县中学2023届高三一模理科数学试题(已下线)专题4 大题分类练(空间向量与立体几何)拔高能力练 高二期末
名校
9 . 如图,平面
平面
,
,
,
,
,
,
,平面
与平面
交于
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/13/a192bad9-2814-4ded-b5eb-4a18315834f4.png?resizew=253)
(1)求证:
;
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9a6db3571fa57bfa2d5e4d44c51b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5441d73845911db1993bf903c4d8700f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d5427b7b994b860628df3d6b7a07de8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d00572a90232e08932317af2a53767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/13/a192bad9-2814-4ded-b5eb-4a18315834f4.png?resizew=253)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c11e72609ba0fbefe03c9f24165cbf11.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d9f10d4ebbc23dacfde5ac5854eed5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2b6797e834bb430abf574c2f2b3c107.png)
您最近一年使用:0次
2022-08-11更新
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1177次组卷
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5卷引用:北京市首师大附中2021届高三4月份高考数学模拟试题
北京市首师大附中2021届高三4月份高考数学模拟试题(已下线)1.4 空间向量的应用(精练)-2021-2022学年高二数学一隅三反系列(人教A版2019选择性必修第一册)2023版 北师大版(2019) 选修第一册 突围者 第三章 专项拓展训练1 空间直角坐标系的构建策略四川省隆昌市第一中学2022-2023学年高三上学期8月开学考试数学试题(已下线)第一章 空间向量与立体几何(A卷·知识通关练)(2)
名校
10 . 如图所示,在多面体
中,四边形
,
,
均为边长为
的正方形,
为
的中点,过
的平面交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/14/acafb3c8-749b-4f92-be5c-2f228038fc8a.png?resizew=200)
(1)证明:
.
(2)求平面
与平面
成角的余弦值.
(3)直接写出三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16b6e1ec79fd5adf04c8a98df0745e26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfbc0b5a8fbde804bd8425a4b76d207.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53de67d55ead2f0347f902e6f9d5da42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e539f26ed5e0b20ff7220559324869a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/14/acafb3c8-749b-4f92-be5c-2f228038fc8a.png?resizew=200)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59cccc15c7cb2402341af1d5e3dd14bd.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b237ef19a4f4d26c3e32957574f149a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)直接写出三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8964550c7fc31d982b1534e884ad6f52.png)
您最近一年使用:0次