1 . 如图,在四棱锥
中,底面为直角梯形,
,
底面
,且
分别为
的中点.
;
(2)求
与平面
所成的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25cf1949a53a014c451ee56801800f3.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/5857b03445433bfe181ea446ecc4b51b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829a1a887ceba13dd8551b1e3604bf6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/962515007ca98ad2d36557b60a42ad6f.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a406f24b5131eb7da9127750319e52.png)
您最近一年使用:0次
2022-11-09更新
|
1100次组卷
|
5卷引用:2006年普通高等学校招生考试数学(文)试题(浙江卷)
2006年普通高等学校招生考试数学(文)试题(浙江卷)黑龙江省大庆市东风中学2023-2024学年高二上学期开学考试数学试题(已下线)易错31题专练(沪教版2020必修三全部内容)-2022-2023学年高二数学考试满分全攻略(沪教版2020必修三)内蒙古自治区赤峰市赤峰红旗中学2022-2023学年高一下学期期末数学试题专题05 空间直线、平面的垂直-《期末真题分类汇编》(新高考专用)
名校
2 . 在如图所示的多面体中,
平面
,
平面
,
,且
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/2021/10/13/2828554282008576/2830058682859520/STEM/dd22823ed2b74e7aaff8fd0198c48b43.png?resizew=202)
(1)求证:
;
(2)求平面
与平面
所成的锐二面角的正弦值;
(3)在棱
上是否存在一点
,使得直线
与平面
所成的角为
,若存在,指出点
的位置;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed04b01505bbd8a4ac0bc12e46f23bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4c5ae16a7145a28a91d45ef950a07c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/845d5c3f2067a8173a569003714282ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2021/10/13/2828554282008576/2830058682859520/STEM/dd22823ed2b74e7aaff8fd0198c48b43.png?resizew=202)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/785546906851d56da452b46052eeb8a0.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/558ce69401f3c97930f00ba0e2aa6647.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
(3)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/558ce69401f3c97930f00ba0e2aa6647.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
您最近一年使用:0次
2021-10-15更新
|
366次组卷
|
7卷引用:陕西省商洛市商丹高新学校2018-2019学年高二下学期开学检测数学理科试题
名校
3 . 如图1,在平行四边形
中,
=60°,
,
,
,
分别为
,
的中点,现把平行四边形
沿
折起如图2所示,连接
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/b8e39710-99eb-4ef5-abe1-9a672673aa4c.png?resizew=396)
(1)求证:
;
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/883732ae71bfed76e07732ec709f4653.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4b5d693c4f0c4d0e6c0c810e7d464b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/883732ae71bfed76e07732ec709f4653.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa6cb992b6faad4744f85d73a3b76dd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a56f2e56229a722d1f40d74d3967a3d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/b8e39710-99eb-4ef5-abe1-9a672673aa4c.png?resizew=396)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82c2b3adb41e8965f553da2e5086a751.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a677b42f8b427b21924a559b90141d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c44507c93f6180afd1697d2fa5a5c741.png)
您最近一年使用:0次
2021-06-15更新
|
1645次组卷
|
12卷引用:广西南宁二中2020届高三4月开学考试理数试题
广西南宁二中2020届高三4月开学考试理数试题2016届福建福州市高三上学期期末数学(理)试卷2017届河南南阳一中高三理上学期月考四数学试卷宁夏石嘴山市第三中学2017届高三下学期第三次模拟考试数学(理)试题河南省南阳市2018届高三期终质量评估数学(理)试题四川省成都市实验外国语学校2020届高三(高2017级)数学模拟(三)理试题(已下线)专题19 立体几何综合-2020年高考数学(理)母题题源解密(全国Ⅲ专版)湖北省武汉一中2021届高三下学期二模数学试题广东省广州市广州大学附属中学2021-2022学年高二上学期第一次月考数学试题广东省真光中学2021-2022学年高二上学期10月月考数学试题(已下线)2022年高考考前20天终极冲刺攻略(三)【理科数学】 (5月27日)2023版 北师大版(2019) 选修第一册 突围者 第三章 专项拓展训练3 用空间向量解决折叠问题
名校
解题方法
4 . 如图,四棱锥
中,平面
底面ABCD,
是等边三角形,底面ABCD为梯形,且
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/3ef54571-0ce4-45a2-a19e-d531d46feedc.png?resizew=177)
(1)证明:
;
(2)求A到平面PBD的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19ad6a0124359e8b9f7649cf0bff51ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36aae82d53f2a35d2f95f467bd5b76cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa3f8ecc57e62a8ef9b5be34ea6c963c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/3ef54571-0ce4-45a2-a19e-d531d46feedc.png?resizew=177)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5d56d8170b764b80a672cd6c861921.png)
(2)求A到平面PBD的距离.
您最近一年使用:0次
2021-02-28更新
|
364次组卷
|
14卷引用:【全国校级联考】重庆市中山外国语学校2019届高三上学期开学考试(9月)数学(文)试题
【全国校级联考】重庆市中山外国语学校2019届高三上学期开学考试(9月)数学(文)试题四川省成都七中2020-2021学年高三入学考试数学文科试题四川省成都市第七中学2020-2021学年高三上学期开学考试数学(文)试题东北师范大学附属中学2018届高三第五次模拟考试数学(文科)试题【全国百强校】辽宁省大连八中2019届高三(上)期中数学试题(文科)四川省宜宾市叙州区第二中学校2019-2020学年高三下学期第二次月考数学(文)试题福建省漳州市2019届高三毕业班高考模拟(一)试卷数学(文)试题四川省简阳市阳安中学2020-2021学年高三10月月考数学(文)试题新疆实验中学2021届高三10月月考数学试题河北省邯郸市大名县一中2020-2021学年高二(实验班)上学期10月半月考数学试题安徽省滁州市定远县育才学校2021届高三下学期开学考试数学(文)试题江西省南昌市第十中学2022届高三下学期第一次月考数学(文)试题辽宁省阜新市第二高级中学2022-2023学年高二上学期期中数学试题贵州省黔西南州金成实验学校2023-2024学年高二上学期第一次月考数学试题
名校
解题方法
5 . 如图,直三棱柱
中,底面
为等腰直角三角形,
,
,
,
分别为
,
的中点,
为棱
上一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/ac4fa6ce-ded8-40b5-8a0b-e5c0a3726dd7.png?resizew=163)
(1)求证
;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95196d4658088f565e495c005cfed5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbb16f7dbc4b9993c4efa0764df1d8ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bc6f5baa8ff93bc41b7fa2ea5f210d6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/ac4fa6ce-ded8-40b5-8a0b-e5c0a3726dd7.png?resizew=163)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/336a63a5f369abc2cc9055b430661842.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/099c5ca455f63069a72eb669a4ea4534.png)
您最近一年使用:0次
2020-08-27更新
|
193次组卷
|
9卷引用:2020届吉林省长春市高三质量监测(二)文科数学试题
2020届吉林省长春市高三质量监测(二)文科数学试题吉林省长春市2020届高三质量监测(四模)数学(文科)试题江西省南昌十中2020届高三高考适应性考试文科数学试题吉林省长春市2020届高考数学二模试卷(文科)(已下线)专题20+立体几何综合-2020年高考数学(文)母题题源解密(全国Ⅱ专版)吉林省长春市汽车经济技术开发区第六中学2020-2021学年第一学期高二月考数学(文)试题吉林省长春外国语学校2021-2022学年高三上学期期初考试数学(文)试题甘肃省武威第二中学2020-2021学年高三下学期开学考试文科数学试题(已下线)专题20 立体几何综合-2020年高考数学(文)母题题源解密(全国Ⅱ专版)
解题方法
6 . 如图,在直三棱柱
中,已知
,设
的中点为
,
.求证:
![](https://img.xkw.com/dksih/QBM/2020/8/14/2527831942242304/2530675692716032/STEM/5843b21c-e222-4d2c-8df9-5e1d4f551b9e.png)
(1)
平面
(指出所有大前提、小前提、结论);
(2)
(用分析法证明).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eec2bbb7272f66c7cf92620da8372d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88b866f54e2c5c1df06364cdc7eb59bc.png)
![](https://img.xkw.com/dksih/QBM/2020/8/14/2527831942242304/2530675692716032/STEM/5843b21c-e222-4d2c-8df9-5e1d4f551b9e.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063510e3c1fb6a7ccc3b8e3e3c7d660e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98faac7a82235d53bb4b6abe7ee54951.png)
您最近一年使用:0次
名校
7 . 阳马和鳖臑(biē nào)是《九章算术·商功》里对两种锥体的称谓.如图所示,取一个长方体,按图斜割一分为二,得两个一模一样的三棱柱,称为堑堵.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/94b7bc01-ac0b-4a7c-b181-5c1d3cb8733c.png?resizew=285)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/0ffe86f8-856a-4d9e-96d1-48199e2d16eb.png?resizew=125)
再沿其中一个堑堵的一个顶点与相对的棱剖开,得四棱锥和三棱锥各一个,以矩形为底,有一棱与底面垂直的四棱锥,称为阳马(四棱锥
),余下的三棱锥是由四个直角三角形组成的四面体(三棱锥
),称为鳖臑.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/5256c1a2-b95f-45bf-8cd1-0fff723cae74.png?resizew=303)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/99a3862a-d8d1-45d9-a477-01a62dbc8846.png?resizew=113)
(1)在阳马(四棱锥
)中,连接
,若
,证明:
;
(2)若
,
,
,求鳖臑(三棱锥
)中二面角
的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/94b7bc01-ac0b-4a7c-b181-5c1d3cb8733c.png?resizew=285)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/0ffe86f8-856a-4d9e-96d1-48199e2d16eb.png?resizew=125)
再沿其中一个堑堵的一个顶点与相对的棱剖开,得四棱锥和三棱锥各一个,以矩形为底,有一棱与底面垂直的四棱锥,称为阳马(四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c753cb1eb73fd8d136d00462970797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c4b027766a6f6bc77c3faef3d5545b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/5256c1a2-b95f-45bf-8cd1-0fff723cae74.png?resizew=303)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/99a3862a-d8d1-45d9-a477-01a62dbc8846.png?resizew=113)
(1)在阳马(四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c753cb1eb73fd8d136d00462970797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c1976b29312c9522c7856ed610c0a0d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c60216839da6e32a3694de54007e51cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c4b027766a6f6bc77c3faef3d5545b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9e45050779cce642cf41c57de96ba12.png)
您最近一年使用:0次
名校
解题方法
8 . 如图,在三棱锥
中,点
,
分别是棱
,
的中点,且
,
.
![](https://img.xkw.com/dksih/QBM/2020/7/7/2500832771293184/2501464597512192/EXPLANATION/37f9c75a0b9d40b59f2cb8e4ba3015a8.png?resizew=208)
(Ⅰ)求证:
平面
;
(Ⅱ)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb96e0331eebe80ed1ff610faf531fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/499f22283744d2e7cc62bc6461ac92fc.png)
![](https://img.xkw.com/dksih/QBM/2020/7/7/2500832771293184/2501464597512192/EXPLANATION/37f9c75a0b9d40b59f2cb8e4ba3015a8.png?resizew=208)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7592c4f01c8e06c7ee90df5b9413a9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(Ⅱ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3a6922808e9b59352c25c341cf23851.png)
您最近一年使用:0次
2020-07-08更新
|
748次组卷
|
3卷引用:四川省泸州市泸县第五中学2020-2021学年高二上学期开学考试数学(文)试题
名校
9 . 如图,四棱锥
的底面是边长为1的正方形,
垂直于底面
,
.
![](https://img.xkw.com/dksih/QBM/2020/4/17/2443472766517248/2443670787719168/STEM/d845839c114544f29f68ede7f346338b.png?resizew=271)
(1)求平面
与平面
所成二面角的大小;
(2)设棱
的中点为
,求异面直线
与
所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/defa5b53043ae802bb1af7d14374406d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bc2e11ba41dd6be2c30615229068a7e.png)
![](https://img.xkw.com/dksih/QBM/2020/4/17/2443472766517248/2443670787719168/STEM/d845839c114544f29f68ede7f346338b.png?resizew=271)
(1)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21665d21bbfb04410c78345de1fd15ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)设棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6e2867f32d3f1c3cd36cd3a11a8580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d4db9b82b67efe45a02fca32bfcf5dc.png)
您最近一年使用:0次
2020-04-17更新
|
1333次组卷
|
7卷引用:山东省博兴县第一中学2019-2020学年高一下学期开学检测数学试题
解题方法
10 . 如图,在四棱锥
中,
,
,
是等边三角形,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/e2a18de2-c66d-42df-9e1b-22557a1455e2.png?resizew=208)
(1)求证:
;
(2)求直线
与平面
所成的角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bce559fceb4731f8d4323410075a22b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da7bcea5a45eeae211f5851f12a7517.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ada4b1a1df7f0959222d971f928c392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638d9cccb679214718224c3088ed4a10.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/e2a18de2-c66d-42df-9e1b-22557a1455e2.png?resizew=208)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d8455347237248c7701100642c5b119.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e106f4233be16e98f2c1bf9f1635622.png)
您最近一年使用:0次