1 . 如图,已知四棱锥
的底面
为梯形,
,
,
,
,
,点
在底面
上的投影落在
边上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/aed2293d-56f0-45c4-bd82-235f301684d9.png?resizew=178)
(1)若
为
上一点且
,证明:
平面
;
(2)求二面角
的余弦值.
![](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/ef98c6b4e6c93d28bee8e6c179b2388e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1328e05d150f86dbe18656662eaa8f6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e921f46d90e43f4517c55832b6280f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c016262f7c32817de8cb270fc9244f5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/aed2293d-56f0-45c4-bd82-235f301684d9.png?resizew=178)
(1)若
![](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/afcbbbe350b38381d1999e2886d45f0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa3a11fdd8e70e6284dec28e0b92e248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c911b404bbb8f8d5f1470585fa31ad97.png)
您最近一年使用:0次
2 . 如图,四棱锥
中,底面
是菱形,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/b8740628-bffd-49b1-901d-7643e8dd2fc1.png?resizew=215)
(1)证明:平面
平面
;
(2)若
,
,
,求二面角
的余弦值.
![](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/32d0710321d97361e5782124bbf7f0c9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/b8740628-bffd-49b1-901d-7643e8dd2fc1.png?resizew=215)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1095b030f441de5fb223781b00f3dd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e4d775e9fb8bca58a25e75d5b21b05f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9396a2523d078c7fafbdcf231a9e772d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de2479cd9055e57e504d64ea7d97e71e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e867e5c7ef4da37d8985ce82022060e.png)
您最近一年使用:0次
2020-01-29更新
|
1315次组卷
|
8卷引用:广东省广州市荔湾区2019-2020学年高二上学期期末数学试题
名校
解题方法
3 . 如图,三棱柱
中,侧面
为菱形,
的中点为
,且
平面
.
![](https://img.xkw.com/dksih/QBM/2020/2/9/2395180957474816/2395793034846208/STEM/81ba365c-678c-4968-920c-497ef6a52dbe.png)
(1)证明:
;
(2)若
,
,
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ce03b310edce42191f9fa75a1c909ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://img.xkw.com/dksih/QBM/2020/2/9/2395180957474816/2395793034846208/STEM/81ba365c-678c-4968-920c-497ef6a52dbe.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8db87b41df9d3c83d2810a4265d768d3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c7fd49bb962841b4575805030e19add.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f2e238b2757353026133bbe495645e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea67423ce6963c0972867306169f17a.png)
您最近一年使用:0次
2020-02-10更新
|
400次组卷
|
3卷引用:广东省广州市第一一三中学2019-2020学年高一下学期期中数学试题
4 . 如图,空间几何体
,△
、△
、△
均是边长为2的等边三角形,平面
平面
,且平面
平面
,
为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/d20f9d0d-bcc2-4cfe-90af-c3a077c123be.png?resizew=147)
(1)证明:
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8257b6bd25104e07b9ad935c0a3aac4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17580410bf63dba4fe164265afaac4cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14172212b7b34eaf967c5a72233621c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/d20f9d0d-bcc2-4cfe-90af-c3a077c123be.png?resizew=147)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebc26eda15abd72b7efe68af47639a5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5617a404c5a3356753136e5a6b6d51e5.png)
您最近一年使用:0次
2019-09-29更新
|
277次组卷
|
2卷引用:广东省广州市增城区2019-2020学年高三第一学期调研测试(一)数学理科试题
5 . 已知矩形
中,
,
,沿对角线
将
折起至
,使得二面角
为
,连结
.
(1)求证:平面
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a88c44f558705de3bcefcfc0ece96b8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f8f01137e92c0f2e63467036ae9cce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30f221c6eff7ed25794b7fe387bee22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf29d07c3751c41ab3503065a5a5052e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/260200d547998bcac50a4a491382e7f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/a39275d1-8ab1-4cbb-a448-362590507407.png?resizew=335)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a4bddf1ea3c5d37f2233a4821909e9.png)
您最近一年使用:0次
2019-11-20更新
|
445次组卷
|
2卷引用:2019届广东省华南师大附中高三三模数学(理)试题
解题方法
6 . 如图,三棱柱
中,侧面
为菱形,
的中点为
,且
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/2dbc15b5-e5d5-4a4d-b9da-f2f797abb58f.png?resizew=230)
(1)证明:
;
(2)若
,
,
,试画出二面角
的平面角,并求它的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ce03b310edce42191f9fa75a1c909ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/2dbc15b5-e5d5-4a4d-b9da-f2f797abb58f.png?resizew=230)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8db87b41df9d3c83d2810a4265d768d3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c7fd49bb962841b4575805030e19add.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eab3c1c4935d98496b8e1eae01b5ecce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea67423ce6963c0972867306169f17a.png)
您最近一年使用:0次
2019-07-06更新
|
1047次组卷
|
2卷引用:2019年广东省广州市海珠区高一下学期期末考试数学试题
7 . 如图所示,
平面ABCD,
为等边三角形,
,
,M为AC的中点.
证明:
平面PCD;
若PD与平面PAC所成角的正切值为
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb4564baf209de77802d46cda82995c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65b0de5237c88a9bfffc207bab17191a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbbce5e466ed2a070a405c588fc7e028.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0f2acab56e2002173333e27b5738416.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eb00a19477b29b325a5e334207f6b18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad0cdf6ee1a89d55c2daa6f153dfac07.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/93285e30-edad-4a5e-9352-8756709a3143.jpg?resizew=203)
您最近一年使用:0次
8 . 如图所示,在四棱锥P-ABCD中,PA⊥底面ABCD,AB⊥AD,AC⊥CD,∠ABC=60°,PA=AB=BC,E是PC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/a50c5807-f76f-4264-a768-474742e199c2.png?resizew=164)
(1)求证:AE⊥平面PCD;
(2)求PB和平面PAD所成的角的大小;
(3)求二面角A-PD-C的正弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/a50c5807-f76f-4264-a768-474742e199c2.png?resizew=164)
(1)求证:AE⊥平面PCD;
(2)求PB和平面PAD所成的角的大小;
(3)求二面角A-PD-C的正弦值.
您最近一年使用:0次
2019-02-09更新
|
1327次组卷
|
9卷引用:2012-2013学年广东省广州六中高一上学期期末考试数学试卷
(已下线)2012-2013学年广东省广州六中高一上学期期末考试数学试卷(已下线)2010年河南省卫辉市高级中学高一第三次月考数学试卷(已下线)2012届山东省莘县实验高中高三一轮复习质量检测理科数学2015-2016学年河南省许昌市三校高一上学期第三次考试数学试卷2015-2016学年甘肃省兰州一中高一上学期期末数学试卷22016-2017学年河北冀州市中学高二上开学测数学理试卷江西省玉山县第一中学2016-2017学年高二下学期第一次考试数学(理)试题(已下线)1.2.4 第2课时 两平面垂直的判定(课后作业)-2018-2019版数学创新设计课堂讲义同步系列(苏教版必修2)黑龙江省大庆实验中学2019-2020学年高二上学期开学考试数学(理)试题
9 . 在如图所示的几何体中,四边形
是等腰梯形,
∥
,
平面
.
(Ⅰ)求证:
平面
;
(Ⅱ)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b6fa70b88c1b619f9044e8488e8b1ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb78cfe939324896f01fd245149aa063.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97a9b32570d553161be04d13954e92a1.png)
(Ⅱ)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e9d40f58f5fd5fb401a529a42b93ff1.png)
![](https://img.xkw.com/dksih/QBM/2012/6/20/1570893451526144/1570893457178624/STEM/1a2f3b6b-3352-4758-a219-14d4a78a5ee3.png)
您最近一年使用:0次
2019-01-30更新
|
4165次组卷
|
17卷引用:广东省广州市华南师范大学附属中学2018届高三综合测试(二) 理科数学试卷
广东省广州市华南师范大学附属中学2018届高三综合测试(二) 理科数学试卷2012年全国普通高等学校招生统一考试理科数学(山东卷)(已下线)2014届湖南省长沙市高考二模文科数学试卷2015-2016学年广东省揭阳市惠来一中等高二上学期期末理科数学试卷2015-2016学年广东省惠来一中、揭东一中高二上期末理科数学试卷(已下线)同步君人教A版必修2第二章2.3.4直线与平面垂直的性质高中数学人教版 必修2 第二章 点、直线、平面之间的位置关系 2.3.4平面与平面垂直的性质广西防城港市2018届高中毕业班1月模拟考试数学(理)试题2018-2019学年高中数学必修2人教版:评估验收卷(二)湖南省醴陵市第一中学2018-2019学年高二上学期期末考试数学(理)试题新疆维吾尔自治区石河子市第二中学2018-2019学年高一上学期期末考试数学试题江苏省连云港市赣榆区智贤中学2019-2020学年高一下学期5月月考数学试题广西壮族自治区田阳高中2019-2020学年高二6月月考数学(理)试题人教B版(2019) 选择性必修第一册 过关斩将 第一章 空间向量与立体几何 本章复习提升安徽省池州市东至县第三中学2020-2021学年高二上学期期中理科数学试题山西省怀仁市第一中学校云东校区2021-2022学年高一下学期第三次月考数学(理)试题江西省抚州市南城县第二中学2022-2023年高二下学期第一次月考数学试题
名校
10 . 已知四棱锥
的底面为直角梯形,
,
底面
且
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/f96dc826-ac5b-4618-84ae-39127823ff5f.png?resizew=187)
(1)求证:直线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
平面
;
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8772511d66c1519dbb47432e35b974b2.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/ac606016b794655d7b64a09d4115a8a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/f96dc826-ac5b-4618-84ae-39127823ff5f.png?resizew=187)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b80ee363635d73f601654339028daec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e9a8d2e4172812913af13badafa4dbb.png)
您最近一年使用:0次
2018-08-26更新
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691次组卷
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3卷引用:广州市岭南中学2016-2017学年期高二第二学期中考试理科数学试题