名校
解题方法
1 . 如图所示,在正方体ABCD-A1B1C1D1中,点O是AC与BD的交点,点E是线段OD1上的一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/5427609a-2690-43af-b583-fcb1d9c4dfa7.png?resizew=157)
(1)若点E为OD1的中点,求直线OD1与平面CDE所成角的正弦值;
(2)是否存在点E,使得平面CDE⊥平面CD1O?若存在,请指出点E的位置,并加以证明;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/5427609a-2690-43af-b583-fcb1d9c4dfa7.png?resizew=157)
(1)若点E为OD1的中点,求直线OD1与平面CDE所成角的正弦值;
(2)是否存在点E,使得平面CDE⊥平面CD1O?若存在,请指出点E的位置,并加以证明;若不存在,请说明理由.
您最近一年使用:0次
2021-04-17更新
|
663次组卷
|
8卷引用:【市级联考】河南省新乡市2019届高三3月份质量检测数学(理)试题
【市级联考】河南省新乡市2019届高三3月份质量检测数学(理)试题【校级联考】陕西省汉中市重点中学2019届高三下学期3月联考数学(理)试题【省级联考】山西省2019届高三百日冲刺考试数学(理)试题(已下线)理科数学-6月大数据精选模拟卷01(新课标Ⅱ卷)(满分冲刺篇)(已下线)解密07 空间几何中的向量方法(讲义)-【高频考点解密】2021年新高考数学二轮复习讲义+分层训练吉林省长春市东北师范大学附属中学2022届高三理科数学综合训练(一)北京交通大学附属中学2022-2023学年高二上学期期中考试数学试题四川省盐亭中学2022-2023学年高二下学期第一学月教学质量监测理科数学试题
名校
2 . 如图,四棱锥
的底面是矩形,平面
平面
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/eca98558-9f22-44cf-a1ac-e6cb22a0181f.png?resizew=170)
(Ⅰ)求证:
;
(Ⅱ)设
,若
,且二面角
的余弦值为
,求
的值.
![](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/e66cef506a91c5e28723f6f19895c27b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/eca98558-9f22-44cf-a1ac-e6cb22a0181f.png?resizew=170)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/371853a703a8dafa6f8e942f46cb8706.png)
(Ⅱ)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7294dd558b29d59bdc6e4b8ba4c392d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c383691e8d740830a865b12d66f7633.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b33b7213d99a817bff19bcf740a0697c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d77d19204d12a34986025a453e2f3de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
2020-09-26更新
|
281次组卷
|
2卷引用:河南省2020-2021学年上学期高中毕业班阶段性测试(一)理科数学试题
3 . 在四棱锥P﹣ABCD中,底面四边形ABCD是一个菱形,且∠ABC
,AB=2,PA⊥平面ABCD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/902617b6-4af9-41f0-92ae-0d1b91e78e2b.png?resizew=180)
(1)若Q是线段PC上的任意一点,证明:平面PAC⊥平面QBD.
(2)当平面PBC与平面PDC所成的锐二面角的余弦值为
时,求PA的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06208e44ee3ae77bd78df612a39c1c90.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/902617b6-4af9-41f0-92ae-0d1b91e78e2b.png?resizew=180)
(1)若Q是线段PC上的任意一点,证明:平面PAC⊥平面QBD.
(2)当平面PBC与平面PDC所成的锐二面角的余弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7294f5ae2a24ff42e84cd9773b2a7287.png)
您最近一年使用:0次
2020-05-16更新
|
182次组卷
|
4卷引用:2020届河北省高考(5月)模拟数学(理)试题
2020届河北省高考(5月)模拟数学(理)试题河南省温县第一高级中学2021-2022学年高三上学期1月月考理科数学试题(已下线)大题专项训练16:立体几何(二面角)-2021届高三数学二轮复习广西玉林市2022届高三上学期教学质量监测数学(理)试题
名校
解题方法
4 . 如图,在四棱锥
中,
,
,
,
、
分别为棱
、
的中点,
.
![](https://img.xkw.com/dksih/QBM/2020/5/12/2461196717187072/2461361926905856/STEM/03dd1709041b4b4d8a38bbfdd796bb7e.png?resizew=154)
(1)证明:平面
平面
;
(2)若二面角
的大小为45°,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/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6378fc7805bd0729f6a00a8bd2662d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3384e2b63e4be03a8762b819499e669b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b44f4120c94cb7176dc31fcac387b32e.png)
![](https://img.xkw.com/dksih/QBM/2020/5/12/2461196717187072/2461361926905856/STEM/03dd1709041b4b4d8a38bbfdd796bb7e.png?resizew=154)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/762fdd81773da47079a97e61f320f6df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1636b4530c0b42d0e0b649e90e3b9e85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9068f29d671d76d1e95ba3a4eaff5b96.png)
您最近一年使用:0次
2020-05-12更新
|
747次组卷
|
5卷引用:2020届山东省德州市高三第一次(4月)模拟考试数学试题
名校
解题方法
5 . 已知,图中直棱柱
的底面是菱形,其中
.又点
分别在棱
上运动,且满足:
,
.
![](https://img.xkw.com/dksih/QBM/2020/5/2/2453970522234880/2453997798014976/STEM/4358c504-ca50-4dc5-b48b-a8ee2b0667d6.png)
(1)求证:
四点共面,并证明
∥平面
.
(2)是否存在点
使得二面角
的余弦值为
?如果存在,求出
的长;如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa102f519d541f2e4d10a8975a41c36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33d6dc34b0b71d46a91eb8dd8db01f5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360a93b9662f0ab8a69b131497520b53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/626db48efbecf4e318252ba13baff47d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1357d24d53b523a55b3eea7b21fa16f1.png)
![](https://img.xkw.com/dksih/QBM/2020/5/2/2453970522234880/2453997798014976/STEM/4358c504-ca50-4dc5-b48b-a8ee2b0667d6.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33d6dc34b0b71d46a91eb8dd8db01f5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c51c4a1148587943fe9ba210f6141ee.png)
(2)是否存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e807172fa9eca2416f92f341adc06165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee14db57f0c762aad845cf5b4a243c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
您最近一年使用:0次
2020-05-02更新
|
1265次组卷
|
5卷引用:2020届河南省高三第十次调研考试数学(理)试题
2020届河南省高三第十次调研考试数学(理)试题江西省分宜中学、玉山一中等九校2019-2020学年高三联合考试数学理科试卷河北省衡水中学2019-2020学年高三下学期第十次调研数学(理)试题甘肃省兰州市第一中学2020届高三冲刺模拟考试(三)数学(理)试题(已下线)1.4 空间向量的应用-2021-2022学年高二数学尖子生同步培优题典(人教A版2019选择性必修第一册)
名校
6 . 如图,四棱锥
中,侧面
是边长为2的等边三角形且垂直于底面
,
,
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/1ae9060f-308c-4ea5-b699-5d65a7fe6391.png?resizew=205)
(1)求证:直线
平面
;
(2)点
在棱
上,且二面角
的余弦值为
,求直线
与底面
所成角的正弦值.
![](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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78aafccd397e9c88a567abf4993d40f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7af36689a2d2a5f999b3b5859a3c9faf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/1ae9060f-308c-4ea5-b699-5d65a7fe6391.png?resizew=205)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/932a04304f2d4975955d4baabb2deeea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96fe44cb45b52ade75574ed31d05fb26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3aace91caec728e174daec29a3568ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
2020-04-20更新
|
1013次组卷
|
2卷引用:2020届河南省许昌济源平顶山高三第二次质量检测理科数学试题
解题方法
7 . 如图,在四棱锥
中, ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b78e863d0251d8e80446423dadc9033.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/3b7f2a86-07de-444d-ae1a-f027683aa30b.png?resizew=196)
(1)求证:平面
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5000fea066102e62cf2128ccbbd2b3e3.png)
(2)已知点
在线段
上,且
,若平面与平面
所成的二面角大小为
,求
的值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b78e863d0251d8e80446423dadc9033.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/3b7f2a86-07de-444d-ae1a-f027683aa30b.png?resizew=196)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b6e6192cf24ada791c26c2d6d434069.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5000fea066102e62cf2128ccbbd2b3e3.png)
(2)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2bc5e50b8dfa02601c70822252854a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d3520ab136bf360298cac554b387de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5000fea066102e62cf2128ccbbd2b3e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/260200d547998bcac50a4a491382e7f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
名校
8 . 如图,四边形
为矩形,
和
均为等腰直角三角形,且
,
.
![](https://img.xkw.com/dksih/QBM/2020/4/10/2438695101693952/2439180194766848/STEM/5972d8aa4d8a45ba970b1fa8686bc93b.png?resizew=171)
(1)求证:
平面
;
(2)设
,问是否存在
,使得二面角
的余弦值为
?若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3814287dbb60d478bffc5366f9928b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a00d05c60999eff91345a545fb57e9af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c640ca0dde46063402beda887cb646b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a72a523e7db66ac0e08ec294dc4d5b06.png)
![](https://img.xkw.com/dksih/QBM/2020/4/10/2438695101693952/2439180194766848/STEM/5972d8aa4d8a45ba970b1fa8686bc93b.png?resizew=171)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec47f6d6cb1eeefbb466e4fe71fd568c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09d9d486b7f91ba933210dd013a7f2c.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7d3d0d1f098f6eff0b3643136fd96d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19fa7ff056747ebdc342dc2ddf1b4b16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
2020-04-11更新
|
345次组卷
|
2卷引用:2020届河北省保定市高三第一次模拟数学(理)试题
9 . 如图1,
与
是同处在同一个平面内的两个全等的直角三角形,
,连接
是边
是上的一点,过
作
,交
于点
,沿
将
向上翻折,得到如图2所示的六面体![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5bc469f73fba897559c9c365572b13.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/8dd864a4-bf69-49c3-b013-295dcbc6978d.png?resizew=253)
(1)求证:
;
(2)设
,若平面
底面
,且平面
与平面
所成的角的余弦值为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbced129627233661d88e9663a9e13c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5016edd45bb17a56588b90bae0b9f88e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/306eeb30d251c385a7ea3a4faa0f3684.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aadfb41d0f8e09ace55b8e0c744c858.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7807f6a0d316671ed34c23e32fc7408.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5bc469f73fba897559c9c365572b13.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/8dd864a4-bf69-49c3-b013-295dcbc6978d.png?resizew=253)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55e1de129bfc451f4c7160cc50666ad8.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d3c58709b333182d5cd9fd5e8cab784.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f020ca4ad44801691235958e253907d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe2bf7463e33ac907a72ffc3c1d712f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fbbe7f48676298f2ee0cb1901992eaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee14db57f0c762aad845cf5b4a243c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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10 . 如图,在梯形ABCD中,
,
,
,
为梯形
外一点,且
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/49ab773b-46e5-4736-93d6-6d0259631647.png?resizew=145)
(1)求证:
平面
;
(2)当二面角
的平面角的余弦值为
时,求这个四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a75b1354b8b783a65ee5e3bc596a976.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.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/b5f1897a7e856b42f8cee0f286ad913d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/49ab773b-46e5-4736-93d6-6d0259631647.png?resizew=145)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3df5935c893580c77ab6fa6eb0a70bdb.png)
(2)当二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a91c8b2862760a3738751128765c96c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dedfba8b9447a4db53baae62fdeebfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
您最近一年使用:0次