名校
1 . 如图,
是边长为
的等边三角形,四边形
为菱形,平面
平面
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/0334c950-7d0c-46d3-a8b0-44e738a91f93.png?resizew=170)
(1)求证:
平面
;
(2)求平面
与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b9d54cbbf601f4583659771eb534997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c99e6d75d606b5cae9392ecca969200.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59567dbf014b5608475254efb2cf2c0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a8d8fe0503af1c8f8d04eaf211bac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70abed7faf55deb24162255c5ad59577.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/0334c950-7d0c-46d3-a8b0-44e738a91f93.png?resizew=170)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
您最近一年使用:0次
名校
2 . 在如图所示的圆柱
中,AB为圆
的直径,
是
的两个三等分点,EA,FC,GB都是圆柱
的母线.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/d8007de3-faa6-44e8-be88-ce79dcdd3739.png?resizew=192)
(1)求证:
平面ADE;
(2)设BC=1,已知直线AF与平面ACB所成的角为30°,求二面角A—FB—C的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e65ac334119ccd6204402a7aba29a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39acab3cfb59bfc9591371721ab01d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e65ac334119ccd6204402a7aba29a55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/d8007de3-faa6-44e8-be88-ce79dcdd3739.png?resizew=192)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b3d34e4702615fa0e908eda9440c93c.png)
(2)设BC=1,已知直线AF与平面ACB所成的角为30°,求二面角A—FB—C的余弦值.
您最近一年使用:0次
2020-06-29更新
|
2606次组卷
|
10卷引用:广东省佛山市南海区、三水区2023届高三上学期8月摸底数学试题
广东省佛山市南海区、三水区2023届高三上学期8月摸底数学试题四川省宜宾市叙州区第一中学校2022-2023学年高二上学期期中考试数学(理)试题山东省滨州市2020届高三三模考试数学试题(已下线)专题九 立体几何与空间向量-山东省2020二模汇编湖南省长沙市长郡中学2020-2021学年高三上学期月考(三)数学试题山西省怀仁市2020-2021学年高二上学期期中数学(理)试题湖南省岳阳市第一中学2020-2021学年高二下学期第一次质量检测数学试题江苏省盐城中学2021届高三下学期仿真模拟数学试题江西省宜春市天立高级中学2020-2021学年高一下学期期末数学试题四川省巴中市恩阳区2021-2022学年高二上学期期中考试数学试题
3 . 如图,
为圆锥的顶点,
为圆锥底面的圆心,
为底面直径,
为底面圆周上一点,
,四边形
为矩形,点
在
上,且
平面
.
![](https://img.xkw.com/dksih/QBM/2022/5/6/2973651645530112/2974963590799360/STEM/68b66aa8-c580-412a-8ce6-923d1ec1ca0c.png?resizew=289)
(1)请判断点
的位置并说明理由;
(2)平面
将多面体
分成两部分,求体积较大部分几何体的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cfe71b1bd5d58b604e0f1ff775fb92a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d2806aad4bdfa727f3d4150434ab055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a2b5cfae407016cad45bbdefea05833.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca48c18021e7be4bbb3e95576e1c1b5f.png)
![](https://img.xkw.com/dksih/QBM/2022/5/6/2973651645530112/2974963590799360/STEM/68b66aa8-c580-412a-8ce6-923d1ec1ca0c.png?resizew=289)
(1)请判断点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(2)平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c761098c711ffc8ad047a6867d2a268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18145e24844c08cb2cc05f69cfbb1c5a.png)
您最近一年使用:0次
2022-05-08更新
|
1091次组卷
|
3卷引用:河南省洛阳市2022届高三第三次统一考试数学(文科)试题
名校
4 . 如图,在四棱锥
中,底面
正方形,平面
底面
,平面
底面
,
,
分别是
的中点,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/16/dff7d99f-8875-4564-93ce-c46cc758ab86.png?resizew=173)
(1)证明:
平面
;
(2)求
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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.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/36dc88c2054948a03e74d57b10d3a482.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e658d7985a600629fdf01517fc55c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67576cc7b83ee93cfd15154bb2a00c5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/16/dff7d99f-8875-4564-93ce-c46cc758ab86.png?resizew=173)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96b8c2721ada247b03f41f328539b301.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
您最近一年使用:0次
2022-09-16更新
|
1100次组卷
|
4卷引用:广东省汕头市金山中学2023届高三上学期摸底考试数学试题
名校
5 . 如图,正方形
和直角梯形
所在平面互相垂直,
,
,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/7/5196057a-6554-4001-8019-85ac67b33f8b.png?resizew=123)
(1)证明:
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/8a6480f384476190883f06c0289c7519.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2ea9d3df7c2bcdf135dedd1554fb82b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cce38d8a8a7043586aad206f8153d0bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a77f26a7be722e00baa984f769ec8d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ce84f6062f12bf6ef42d7b733cd2248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/7/5196057a-6554-4001-8019-85ac67b33f8b.png?resizew=123)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc521258fcaeaf7acffc5ae98c3af6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/646084b7f3902efa4c462ed67599265a.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a34e44c5d7e1d22521fb293994f5b0.png)
您最近一年使用:0次
2022-09-06更新
|
1015次组卷
|
6卷引用:四川省巴中市2022-2023学年高三上学期零诊考试数学(理科)试题
6 . 在正三棱锥
中,O,E,F分别是线段AC,AD,BD的中点,G是OC的中点,且
.
![](https://img.xkw.com/dksih/QBM/2022/5/13/2978458749018112/2981260636577792/STEM/f1a094eb-79b7-4c26-b9e8-a9f5de30ded7.png?resizew=286)
(1)在BC上是否存在一点H?使得平面
平面BOE;
(2)若点M是FG的靠近点F的三等分点,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f443adba65bafc6afe4de77820c31528.png)
![](https://img.xkw.com/dksih/QBM/2022/5/13/2978458749018112/2981260636577792/STEM/f1a094eb-79b7-4c26-b9e8-a9f5de30ded7.png?resizew=286)
(1)在BC上是否存在一点H?使得平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61a5831bd2d949ed609b0f0fd68d0729.png)
(2)若点M是FG的靠近点F的三等分点,求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd35eb631ea35264765e8a0799e15d9.png)
您最近一年使用:0次
2022-05-17更新
|
1113次组卷
|
3卷引用:重庆市巴蜀中学校2021-2022学年高一下学期期中数学试题
重庆市巴蜀中学校2021-2022学年高一下学期期中数学试题山西省晋中市新大陆双语学校2021-2022学年高一下学期5月月考数学试题(已下线)第08练 点线面的位置关系-2022年【暑假分层作业】高一数学(苏教版2019必修第二册)
解题方法
7 . 如图,在三棱柱
中,侧棱
底面
是
中点,
是
中点,
是
与
的交点,点
在线段
上.
![](https://img.xkw.com/dksih/QBM/2021/4/1/2690608992387072/2690649550749696/STEM/4e06bd37-7ae6-4dae-9845-c2633b2cde03.png)
(1)求证:
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4e7552a39c412d882766dbcd7eeb69.png)
(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/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1ccf3d4def4b634525240bc671a2860.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee16c91119c5601a7c93a6642c95e7f8.png)
![](https://img.xkw.com/dksih/QBM/2021/4/1/2690608992387072/2690649550749696/STEM/4e06bd37-7ae6-4dae-9845-c2633b2cde03.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72221ee5b504d596ff799c0b356aa0ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4e7552a39c412d882766dbcd7eeb69.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4e7552a39c412d882766dbcd7eeb69.png)
您最近一年使用:0次
2021-04-01更新
|
1817次组卷
|
6卷引用:河南省名校联盟2021-2022学年高三下学期第二次模拟文科数学试题
名校
8 . 如图所示,在四棱锥
中,底面四边形
是菱形,底面
是边长为2的等边三角形,PB=PD=
,AP=4AF
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/a93bb600-1ac6-48dc-b699-8a170222ee71.png?resizew=209)
(1)求证:PO⊥底面ABCD
(2)求直线
与OF所成角的大小.
(3)在线段
上是否存在点
,使得
平面
?如果存在,求
的值;如果不存在,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/1fa0c1a6e9990d435f5df2cba32cc203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35361e76a7c85d1886728c8d0200b234.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/a93bb600-1ac6-48dc-b699-8a170222ee71.png?resizew=209)
(1)求证:PO⊥底面ABCD
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
(3)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5865d488a9cf1181016fd2e866177cdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ae8768996ca9a0f2c5d9a19abbd54df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8180b12d96caf2e6b3ca28a474185e41.png)
您最近一年使用:0次
2020-12-05更新
|
2361次组卷
|
11卷引用:上海市南洋模范中学2022-2023学年高二上学期期中数学试题
上海市南洋模范中学2022-2023学年高二上学期期中数学试题上海市向明中学2022-2023学年高二上学期10月月考数学试题四川省巴中市恩阳区2022-2023学年高二上学期期中数学试题新疆哈密市第八中学2021-2022学年高二上学期期末数学(理)试题四川省遂宁市安居区2020-2021学年高二上学期期中考试数学(文)试题江西省南昌市豫章中学2021-2022学年高二入学调研(B)数学(理)试题新疆新源县2020-2021学年高一下学期期末联考数学试题四川省遂宁市射洪中学2021-2022学年高二上学期第一次月考数学理试题四川省遂宁中学校2021-2022学年高二上学期期中考试数学(文)试题河南省温县第一高级中学2021-2022学年高二上学期12月月考文科数学试题(已下线)期中测试卷01(测试范围:第10-11章)-2023-2024学年高二数学单元速记·巧练(沪教版2020必修第三册)
名校
解题方法
9 . 如图,在四棱锥
中,底面
是边长为2的正方形,且
底面
,
与
相交于点O,F点是
的中点,E点在线段
上,且
.
![](https://img.xkw.com/dksih/QBM/2022/5/15/2979785105203200/2980881629863936/STEM/5abe5b0e733d470cb68901de38115b46.png?resizew=151)
(1)求证:直线
∥平面
;
(2)若二面角
的正切值为
,求四棱锥
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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/457c2ee2c0139622d2e5de9a51c106b6.png)
![](https://img.xkw.com/dksih/QBM/2022/5/15/2979785105203200/2980881629863936/STEM/5abe5b0e733d470cb68901de38115b46.png?resizew=151)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65277734669566578cbb7d690bb200fb.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e4be6ee295b46490a1eed671b6975a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
您最近一年使用:0次
名校
解题方法
10 . 如图,在三棱柱
中,侧棱![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
底面
,
,
,
,
是
中点,
是
中点,
是
与
的交点,点
在线段
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/15/75d1aae6-e961-4ed3-bcf0-a553dc632fde.png?resizew=152)
(1)求证:
平面
;
(2)若二面角
的余弦值是
,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b16cff607cdc2d69afc70dc778acbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee16c91119c5601a7c93a6642c95e7f8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/15/75d1aae6-e961-4ed3-bcf0-a553dc632fde.png?resizew=152)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c203fa3cafdc1d924b61ee1d83a3ecf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4e7552a39c412d882766dbcd7eeb69.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fa2fb03002a3c4e58c4bf3c81a22c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4e7552a39c412d882766dbcd7eeb69.png)
您最近一年使用:0次