名校
1 . 如图,在四棱锥
中,O是
边的中点,
底面
.在底面
中,
.
![](https://img.xkw.com/dksih/QBM/2021/3/29/2688477742915584/2688501080498176/STEM/aaf041cc-5b82-46b7-9504-42d35e45a0cc.png)
(1)求证:
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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e126c16032892966489053f44b9048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b114d2cfa825d1340daa80b5a5df0e80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9e6c5ff493be5e6b3fed95689ae54b.png)
![](https://img.xkw.com/dksih/QBM/2021/3/29/2688477742915584/2688501080498176/STEM/aaf041cc-5b82-46b7-9504-42d35e45a0cc.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307807ee10071bafbe922eb18d2517d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30f457418e6a7e21f0ed0bf490a3709c.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e657a4a33ed01c3a2807218100efbef.png)
您最近一年使用:0次
2021-03-29更新
|
1633次组卷
|
9卷引用:北京市朝阳区2021届高三一模数学试题
解题方法
2 . 如图,在四棱锥P-ABCD中,平面
平面ABCD.
是等腰三角形,且
.在梯形ABCD中,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/20/7f175d78-33c0-4fae-8095-18adc0fa0ab4.png?resizew=158)
(Ⅰ)求证:
平面PDC;
(Ⅱ)求二面角A-PB-C的余弦值;
(Ⅲ)在线段AP上是否存在点H,使得
平面ADP?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a3fd5284e160896f07ce367645fd04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f6094178afeeacdcdec10d7bde05b4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68d31600cba2d5256c7e78b6122d6755.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a0e5697eca3f5205cb7b343648240bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40560ea08d6cd8c1d4d9661ee6faaa3b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/20/7f175d78-33c0-4fae-8095-18adc0fa0ab4.png?resizew=158)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307807ee10071bafbe922eb18d2517d7.png)
(Ⅱ)求二面角A-PB-C的余弦值;
(Ⅲ)在线段AP上是否存在点H,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39748bd3de9c56dfbe313e65645db6dd.png)
您最近一年使用:0次
2020-11-06更新
|
572次组卷
|
2卷引用:北京市朝阳区2018届高三年级第二次综合练习数学(理)测试试题
名校
解题方法
3 . 如图,在三棱柱ABC﹣A1B1C1中,CC1⊥底面ABC,AC⊥BC,D是A1C1的中点,且AC=BC=AA1=2.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/20/4fbc7b21-4ef8-4ffd-a521-ec0d88a20cf6.png?resizew=151)
(1)求证:BC1∥平面AB1D;
(2)求直线BC与平面AB1D所成角的正弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/20/4fbc7b21-4ef8-4ffd-a521-ec0d88a20cf6.png?resizew=151)
(1)求证:BC1∥平面AB1D;
(2)求直线BC与平面AB1D所成角的正弦值.
您最近一年使用:0次
2020-11-03更新
|
1155次组卷
|
4卷引用:北京市朝阳区清华大学附属中学朝阳学校2021-2022学年高二上学期期中数学试题
解题方法
4 . 在四棱锥
中,平面
平面
.底面
为梯形,
,
,且
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/f181d201-27a7-4ba7-9ae5-5e54a6442598.png?resizew=170)
(1)求证:
;
(2)求二面角
的余弦值;
(3)若
是棱
的中点,求证:对于棱
上任意一点
,
与
都不平行.
![](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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da59b318eb096c1effa251d0ae6212ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed6281306726065e7075c579b9b66537.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/f181d201-27a7-4ba7-9ae5-5e54a6442598.png?resizew=170)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c583493109d50c9e4634c05e9042a9f.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/715cc9ea5e7d80930284ffb117142770.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
您最近一年使用:0次
名校
解题方法
5 . 如图,在三棱柱
中,平面
平面
,四边形
是正方形,点
,
分别是棱
,
的中点,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/18/8a2acfc5-4caf-4f4e-a525-06de8753f871.jpg?resizew=162)
(1)求证:
;
(2)求二面角
的余弦值;
(3)若点
在棱
上,且
,判断平面
与平面
是否平行,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61cdaadeae37736a1e6dd93fa1fe712f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.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/133760237c0ccf2d6a83786925b6d23c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/18/8a2acfc5-4caf-4f4e-a525-06de8753f871.jpg?resizew=162)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffeea0a84cdd67bd8bed95bc0f8ae364.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5d02ab4d51f92d437057fd7ff9c1c1.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61506e84751cbb8791a10630c62b57cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41104641f3e2260d00aeadf8fb8a078a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a8035fc825a001d7d9a3dacd8271662.png)
您最近一年使用:0次
2020-05-11更新
|
635次组卷
|
2卷引用:2020届北京市朝阳区高三第一次模拟考试数学试题
6 . 如图,在四棱锥P﹣ABCD中,底面ABCD是正方形,PA⊥AB,PA⊥AD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/4cb9e1ae-0db2-448c-b27f-c3c442469df2.png?resizew=204)
(Ⅰ)求证:PA⊥平面ABCD;
(Ⅱ)已知PA=AD,点E在PD上,且PE:ED=2:1.
(ⅰ)若点F在棱PA上,且PF:FA=2:1,求证:EF∥平面ABCD;
(ⅱ)求二面角D﹣AC﹣E的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/4cb9e1ae-0db2-448c-b27f-c3c442469df2.png?resizew=204)
(Ⅰ)求证:PA⊥平面ABCD;
(Ⅱ)已知PA=AD,点E在PD上,且PE:ED=2:1.
(ⅰ)若点F在棱PA上,且PF:FA=2:1,求证:EF∥平面ABCD;
(ⅱ)求二面角D﹣AC﹣E的余弦值.
您最近一年使用:0次
名校
7 . 如图,在四棱锥P﹣ABCD中,底面ABCD是菱形,且∠DAB=60°.点E是棱PC的中点,平面ABE与棱PD交于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/dd44ddce-66c7-49ad-a5f0-03a9bccbc7f5.png?resizew=199)
(1)求证:AB∥EF;
(2)若PA=PD=AD,且平面PAD⊥平面ABCD,求平面PAF与平面AFE所成的锐二面角的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/dd44ddce-66c7-49ad-a5f0-03a9bccbc7f5.png?resizew=199)
(1)求证:AB∥EF;
(2)若PA=PD=AD,且平面PAD⊥平面ABCD,求平面PAF与平面AFE所成的锐二面角的余弦值.
您最近一年使用:0次
2020-01-11更新
|
530次组卷
|
13卷引用:2016届北京市朝阳区高三上学期期末联考理科数学试卷
2016届北京市朝阳区高三上学期期末联考理科数学试卷2016届江西师大附中、鹰潭一中高三下第一次联考理科数学试卷2017届江西玉山县一中高三上月考二数学(理)试卷2017届吉林省吉林市普通中学高三毕业班第二次调研测试数学(理)试卷湖南省双峰一中2017-2018学年高三上期第一次月考理科数学试题广东省中山市2018届高三上学期期末考试数学(理)试题重庆綦江区2017—2018学年度第一学期期末高中联考高二理科数学试题【全国百强校】宁夏吴忠中学2017-2018学年高二下学期期中考试数学(理)试题重庆市綦江区2017-2018学年高二上学期期末联考数学(理)试卷湖北省黄石市2018-2019学年高二上学期期末质量监测考试数学(理)试题湖北省黄石市2018-2019学年高二上学期期末数学(理)试题重庆市江津中学2020-2021学年高二上学期第二次阶段性考试数学试题云南省陆良县2019届高三第二次模拟数学(理)试题
名校
8 . 如图,在四棱锥
中,底面
是边长为
的菱形,
,
平面
,
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2020/1/12/2375397800370176/2375693395091456/STEM/bbd987fbe8864923a86fa2f681378b1c.png?resizew=179)
(1)求证:
;
(2)求异面直线
与
所成角的余弦值;
(3)判断直线
与平面
的位置关系,请说明理由.
![](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/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b96fac11d72f72c805dbddb8da72d68.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/491c3a4f72b84ebadd28b90711435adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca413c47f7e4064e98a783cc59fb5ef3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2020/1/12/2375397800370176/2375693395091456/STEM/bbd987fbe8864923a86fa2f681378b1c.png?resizew=179)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5d56d8170b764b80a672cd6c861921.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(3)判断直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
您最近一年使用:0次
2020-01-12更新
|
527次组卷
|
2卷引用:北京市朝阳区2019-2020学年高三上学期期末数学试题
9 . 如图,在四棱锥
中,底面
为矩形,平面
平面
.已知
,
.
![](https://img.xkw.com/dksih/QBM/2020/2/22/2407228433891328/2418675245211648/STEM/ab7d701928e54ecda0bff927cdf0e40e.png?resizew=234)
(1)证明:
平面
;
(2)证明:
;
(3)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/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa13ea01adb56b09930c077223a97522.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f67538eedbdf54a1bcaff4394230e81.png)
![](https://img.xkw.com/dksih/QBM/2020/2/22/2407228433891328/2418675245211648/STEM/ab7d701928e54ecda0bff927cdf0e40e.png?resizew=234)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a5edfe97aeab0cf16b40fa9d2e15f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c583493109d50c9e4634c05e9042a9f.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b33b7213d99a817bff19bcf740a0697c.png)
您最近一年使用:0次
名校
10 . 如图,在四棱锥
中,侧面
是等边三角形,且平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
平面
,
为
的中点,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/7a445dfe-be49-4b5b-bb88-5e1db2a0c29e.png?resizew=165)
(Ⅰ)求证:
平面
;
(Ⅱ)求二面角
的余弦值;
(Ⅲ)直线
上是否存在点
,使得
平面
?若存在,求出
的值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.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/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4ab7e657f01bdfa235f8c4d6681d13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fb80d023daff3cc28a8458f29e330fd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/7a445dfe-be49-4b5b-bb88-5e1db2a0c29e.png?resizew=165)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d27ff0b39832f094ec51e28721d739.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(Ⅱ)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42f4096ff62b4f29932cd8c6eef661a3.png)
(Ⅲ)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9abe6e8d1f4f1e8bdc46ddbae0cd789.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f8fb8f67b04f4be9b166c8265f130ca.png)
您最近一年使用:0次
2019-11-11更新
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344次组卷
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2卷引用:北京市朝阳区2019-2020学年高三上学期期中数学试题