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1 . 在等腰
中,
,点
为底边
的中点,将
沿
折起到
的位置,使二面角
的大小为120°,则异面直线
与
所成角的余弦值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e918b70b02a73685e3c536c7f380e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b83beedb3438153e6f728545fe3e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8ec906e6743f799e52acca17dd22731.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26657e5d8cc9f0a5259a5244108666a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b63d2504bd3ecce8c10560b142356f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2022-07-06更新
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455次组卷
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3卷引用:湖南省长沙市第一中学2022-2023学年高二上学期入学考试数学试题
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2 . 在棱长为1的正方体
中,下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/f3e4d7fa-7944-4dc7-8deb-21b457d5eb83.png?resizew=161)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/f3e4d7fa-7944-4dc7-8deb-21b457d5eb83.png?resizew=161)
A.异面直线![]() ![]() ![]() |
B.四面体![]() |
C.二面角![]() ![]() |
D.正方体![]() ![]() |
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2020-07-24更新
|
977次组卷
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6卷引用:湖南省长沙市雅礼中学2020-2021学年高三上学期第5次月考数学试题
湖南省长沙市雅礼中学2020-2021学年高三上学期第5次月考数学试题江苏省南通市通州区2019-2020学年高一下学期期末数学试题(已下线)第2讲 空间向量的应用-2021-2022学年高二数学多选题专项提升(人教A版2019选择性必修第一册)江苏省常州市前黄高级中学2021届高三下学期5月高考适应性考试(一)数学试题广东省2022届高三高考仿真卷二数学试题2023新东方高二上期末考数学02
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解题方法
3 . 如图①所示,长方形
中,
,点M是边CD的中点,将
沿AM翻折到
,连结PB,PC,得到图②的四棱锥
.
(1)若棱PB的中点为N,求CN的长;
(2)设
的大小为
,若
,求平面
和平面
夹角余弦值的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8716b5aad93d97ca1c3791b9c717cc0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f9fba8a4098c1a0515286eb8d616dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb62dd4766d11cfec3aee092b99e40c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfb216a6b4dfa1280e1e67d172fea409.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/26/6be74261-5155-450a-8e60-6f5c6bd730ff.png?resizew=374)
(1)若棱PB的中点为N,求CN的长;
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/212e8c352c4d9b022a057d7d7fa7dd14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd571fb420cd6b9ecb83989f1d39c38f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c745df4f226027778d5fe45b6501b822.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
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4 . 如图,在棱长为
的正方体
中,
为线段
上一动点(包括端点),则以下结论正确的有( )
![](https://img.xkw.com/dksih/QBM/2022/1/22/2900188082339840/2904776444805120/STEM/9b055745-1a5b-4fe3-a204-cb2ce831e508.png?resizew=154)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfbc0b5a8fbde804bd8425a4b76d207.png)
![](https://img.xkw.com/dksih/QBM/2022/1/22/2900188082339840/2904776444805120/STEM/9b055745-1a5b-4fe3-a204-cb2ce831e508.png?resizew=154)
A.三棱锥![]() |
B.过点![]() ![]() ![]() ![]() |
C.直线![]() ![]() ![]() |
D.当点![]() ![]() ![]() ![]() |
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5 . 如图:直三棱柱
中,侧面
,
均为边长为2的正方形,且面
面
分别为正方形对角线
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/3401c7cc-8515-4505-9723-71b144e1ce36.png?resizew=171)
(1)求点
到面
的距离;
(2)求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02cfa6b4db3a67fcd3c169fd8502a66d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9a6db3571fa57bfa2d5e4d44c51b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c49f0af09be9b2d3112b5bdb8b27f128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3db3b70cd3a7b12306eb4fe39a208b3d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/3401c7cc-8515-4505-9723-71b144e1ce36.png?resizew=171)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7b948d211b0815c5ae923a458d6e4ec.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82cb18c10820d927ecd53326f58aaf8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ee5a94f9063a71581f409e47ebaf602.png)
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6 . 如图,已知
,
是直径为
的球
表面上两点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/fde56884-a6ba-4429-92f1-9216095b04a0.png?resizew=239)
(1)证明:
;
(2)若
,二面角
的大小为120º,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9b0d8eab11e2ba621b3a27f72bb3bd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/fde56884-a6ba-4429-92f1-9216095b04a0.png?resizew=239)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70734a8e672376bb0bd1522e229f86a2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/485f0c8a1cdb3b95d39dd33592110d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0b1dc4835daa7ca4581c5373e15bd03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ed01d1ff5a7f21a68fb3a1e5c7f393e.png)
您最近一年使用:0次
2021-03-10更新
|
767次组卷
|
2卷引用:湖南师范大学附属中学2020-2021学年高二下学期第二次月考数学试题
名校
解题方法
7 . 如图,在斜三棱柱
中,已知
为正三角形,四边形
是菱形,
,
分别是
,
的中点,平面
平面
,
![](https://img.xkw.com/dksih/QBM/2021/4/13/2698954841260032/2807105092624384/STEM/a8605454e2134e969d5cb52d783bec05.png?resizew=251)
(1)求证:
平面
;
(2)若
,求二面角
的平面角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0671b4776e142e17a79af5b3f0378ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/2021/4/13/2698954841260032/2807105092624384/STEM/a8605454e2134e969d5cb52d783bec05.png?resizew=251)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d26d8a9d64ad3c8cba28840b41ed7837.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aab6665a33c0a0c6f71803129b5bb72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ce95bdfbd8cd2829a6341b8ca01fce3.png)
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8 . 如图,在平行六面体
中,
,
.
,求点P到直线BD的距离;
(2)求平面
与平面
所成夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cead0e8eadfdcefa334953e88864f424.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4d13ecb54b1006051d2561327aa4755.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79229606d05f53c89b900e37c5cb6f6d.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2bf9ef324f1289e205e29fed105c38e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
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解题方法
9 . 如图,三棱锥
的四个顶点都在球O的球面上,
是边长为6的正三角形,二面角
的大小为
,则点O到平面
的距离为_______ ,球O的表面积为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6694f162dd2040351330a73e81041f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf29d07c3751c41ab3503065a5a5052e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次
2021-09-15更新
|
977次组卷
|
5卷引用:湖南师范大学附属中学2021-2022学年高三上学期第一次月考数学试题
湖南师范大学附属中学2021-2022学年高三上学期第一次月考数学试题湖南师范大学附属中学2021-2022学年高二上学期12月第一次大练习数学试题(已下线)考点30 组合体的“切”“接”综合问题-备战2022年高考数学典型试题解读与变式(已下线)模块三 题型突破篇 小题满分挑战练(2) (北师大版)单元测试B卷——第八章?立体几何初步
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解题方法
10 . 某中学的校友会为感谢学校的教育之恩,准备在学校修建一座四角攒尖的思源亭如图它的上半部分的轮廓可近似看作一个正四棱锥,已知此正四棱锥的侧面与底面所成的二面角为30°,侧棱长为
米,则以下说法不正确( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/cf9789f0-0745-465a-b73e-ed8bb8ff981b.png?resizew=188)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ce0249a3ff99c083fa4421877549db1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/cf9789f0-0745-465a-b73e-ed8bb8ff981b.png?resizew=188)
A.底面边长为6米 | B.体积为![]() |
C.侧面积为![]() | D.侧棱与底面所成角的正弦值为![]() |
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2022-01-29更新
|
414次组卷
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3卷引用:湖南省长沙市宁乡市2021-2022学年高一下学期期末数学试题
湖南省长沙市宁乡市2021-2022学年高一下学期期末数学试题湖南省郴州市2021-2022学年高二上学期期末教学质量监测数学试题(已下线)北京市第五十五中学2023-2024学年高二上学期期末模拟数学试题