1 . 已知四边形
是菱形,四边形
是矩形,平面
平面
,
,
,G是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/eff0fa38-5a0e-449e-bb84-ddc71b80cdf2.png?resizew=160)
(1)证明:
平面
;
(2)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4b93d7abcfc4c3df48f03aa969c17f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2a4e3f0349fa83dc2a0b7d798f04843.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077e97453ae00a89df35be3a0b722df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/eff0fa38-5a0e-449e-bb84-ddc71b80cdf2.png?resizew=160)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f220434c51562f59e302899804899954.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ae8768996ca9a0f2c5d9a19abbd54df.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7267f2934c256fd74e58cb62d685bba0.png)
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名校
2 . 如图,已知等腰梯形
,
,
为等腰直角三角形,
,把
沿
折起.
![](https://img.xkw.com/dksih/QBM/2022/1/19/2897932035956736/2921114494451712/STEM/c3ee9a05-eeb9-4668-82c8-15cc456e2a7b.png?resizew=306)
(1)当
时,求证:
;
(2)当平面
平面
时,求平面
与平面
所成二面角的平面角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e9d43c6acfdda84cac234f192c0b74e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f60db833d4ff6b92c78029e8264ca1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2022/1/19/2897932035956736/2921114494451712/STEM/c3ee9a05-eeb9-4668-82c8-15cc456e2a7b.png?resizew=306)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a47dcb24ffe20e8153e0d113ff8bee3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a417b3d5f4a7eb3b035cf6f61002fdca.png)
(2)当平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf84ed033bd035c2fe7552badd5e447d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a87e6b1915ffd6bdb85808ec6a15e1cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e51817ee1ebf17c73ed21171bcfc5b5.png)
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2022-02-21更新
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2卷引用:广西玉林市普通高中2021-2022学年高二上学期期末考试数学(理)试题
名校
解题方法
3 . 如图,在正方体
中,E为
的中点,则直线
与平面
所成角的正弦值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce1b066f8869d0ff4513f7a99745125.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9539f8fb13345b449274b67bbda995db.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2022-02-21更新
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783次组卷
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8卷引用:广西玉林市普通高中2021-2022学年高二上学期期末考试数学(理)试题
名校
4 . 如图,
,
分别是正三棱柱
的棱
,
的中点,且棱
,
.
![](https://img.xkw.com/dksih/QBM/2022/2/9/2912810254172160/2916987994767360/STEM/20a754e4-688f-47a8-ae8e-54fa54f22d3a.png?resizew=127)
(1)求证:
平面
;
(2)求锐二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](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/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d927585a17c2e98ef7d5a9589a26ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://img.xkw.com/dksih/QBM/2022/2/9/2912810254172160/2916987994767360/STEM/20a754e4-688f-47a8-ae8e-54fa54f22d3a.png?resizew=127)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f894ecf8fcc6c11f7a739f76b3f9c5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b0ec61018d883ea288c2ec406f2f79f.png)
(2)求锐二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95183b555d54b3a09ac20e9dcacb02ec.png)
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2022-02-15更新
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342次组卷
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5卷引用:广西容县高级中学2021-2022学年高二下学期开学考试数学(理)试题
名校
解题方法
5 . 已知图1中,A,B,C,D是正方形EFGH各边的中点,分别沿着AB,BC,CD,DA把
,
,
,
向上折起,使得每个三角形所在的平面都与平面
垂直,再顺次连接
,得到一个如图2所示的多面体,则以下结论正确的是______ .(写出所有正确结论的编号)
![](https://img.xkw.com/dksih/QBM/2021/12/20/2876654261895168/2915527943790592/STEM/fa5f6b0b-06e1-40bd-b967-c977205bd2e0.png?resizew=392)
①
是正三角形;
②平面
平面
;
③直线CG与平面
所成角的正切值为
:
④当
时,多面体
的体积为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bc1b68f13fed987f5209197de7bc8b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c768dedaea22607617398ce28a02dd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63b43490ca09467a4c8cd8cfe91c94e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://img.xkw.com/dksih/QBM/2021/12/20/2876654261895168/2915527943790592/STEM/fa5f6b0b-06e1-40bd-b967-c977205bd2e0.png?resizew=392)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
②平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6501f1c913a4ef64957a2f01ab5baa15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d81164b92b4386fca5d36ad71422e31.png)
③直线CG与平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
④当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9a0c3a4e61b97fa9bc58f3179fc2958.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a391005600bdd69c96750589f9adb048.png)
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960次组卷
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3卷引用:广西2022届高三4月大联考数学(理)试题
广西2022届高三4月大联考数学(理)试题(已下线)NO.3 练悟专区——客观题满分练(一)-2022年高考数学二轮复习讲练测(新教材·新高考地区专用)四川省成都市石室中学2021-2022学年高三上学期一诊考试数学(理)试题
名校
6 . 如图,在棱长为2的正方体
中,E为
的中点F为
的中点,如图建系,则下列说法正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
A.![]() | B.向量![]() ![]() ![]() |
C.平面![]() ![]() | D.点D到直线![]() ![]() |
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2022-02-06更新
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6卷引用:广西柳州市六校2022-2023学年高二上学期期中考试数学试题
名校
解题方法
7 . 如图,在直棱柱
中,
,则异面直线
与
所成角的余弦值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b9aa1bbe83078714076536702dc8345.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd4c85bb98a2a0afddd7ed92578ad2e.png)
![](https://img.xkw.com/dksih/QBM/2022/1/18/2897048863039488/2904786634801152/STEM/765b5b52-fdf2-4ffa-9790-13f2b7d488ad.png?resizew=151)
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5卷引用:广西玉林市普通高中2021-2022学年高二上学期期末考试数学(理)试题
广西玉林市普通高中2021-2022学年高二上学期期末考试数学(理)试题湖南省湖湘名校联盟2021-2022学年高二上学期期末联考数学试题湖南省湘潭市湘潭县2021-2022学年高二上学期期末数学试题山东省淄博实验中学2021-2022学年高二下学期开学考试数学试题(已下线)期末真题必刷易错60题(34个考点专练)-【满分全攻略】2023-2024学年高二数学同步讲义全优学案(人教A版2019选择性必修第一册)
名校
解题方法
8 . 如图,
是圆
的直径,
圆
所在的平面,
为圆周上一点,
为线段
的中点,
,
.
![](https://img.xkw.com/dksih/QBM/2022/1/17/2896502985490432/2902018382725120/STEM/619cdb34-0f14-4d8d-bbb4-0562a2ba7ca2.png?resizew=187)
(1)证明:平面
平面
.
(2)若
为
的中点,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/590388ae64b699fe42b71de76ba3d28d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ff7ad82b0938145af6a5ffa2c9596d8.png)
![](https://img.xkw.com/dksih/QBM/2022/1/17/2896502985490432/2902018382725120/STEM/619cdb34-0f14-4d8d-bbb4-0562a2ba7ca2.png?resizew=187)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf6dc837ae85207789b94d109c5c2eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8711675c09d3eaf3d49ff795ff5f79f.png)
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2022-01-25更新
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1477次组卷
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10卷引用:广西桂林市、梧州市2022届高三高考联合调研(一模)数学(理)试题
名校
9 . 如图,AC是圆O的直径,B是圆O上异于A,C的一点,
平面ABC,点E在棱PB上,且
,
,
.
![](https://img.xkw.com/dksih/QBM/2022/1/18/2897050160242688/2901558845497344/STEM/11bb86f4-c971-4081-a46d-18bf036cc521.png?resizew=157)
(1)求证:
;
(2)当三棱锥
的体积最大时,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfbaf73297240eb116f22489519895a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e93e1661d70eca6d7eb848b667e388e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://img.xkw.com/dksih/QBM/2022/1/18/2897050160242688/2901558845497344/STEM/11bb86f4-c971-4081-a46d-18bf036cc521.png?resizew=157)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4486d52b6e410fd7b60428121d96cef.png)
(2)当三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5617a404c5a3356753136e5a6b6d51e5.png)
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2022-01-24更新
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4卷引用:广西北海市2021-2022学年高二上学期期末检测数学试题
广西北海市2021-2022学年高二上学期期末检测数学试题江西省吉安市2021-2022学年高二上学期期末数学(理)试题试题(已下线)解密15 空间向量与立体几何 (分层训练)-【高频考点解密】2022年高考数学二轮复习讲义+分层训练(全国通用)广东省汕头市金山中学2022届高三下学期3月月考数学试题(A卷)
10 . 如图,四棱锥
的底面是直角梯形,
,
,
平面
,
是
的中点,
与平面
交于点
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/8b9823c8-e56c-4c10-ae54-d5e06f121b41.png?resizew=151)
(1)求证:
是
的中点;
(2)若
为棱
上一点,且直线
与平面
所成的角的正弦值为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2dd10731b99c0f4f89ee957f8a239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.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/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1c37e7a6c15bbc553ad4868d23be7f2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/8b9823c8-e56c-4c10-ae54-d5e06f121b41.png?resizew=151)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.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/fc704b98f4ed2c7359a7a5b6498b5290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7294f5ae2a24ff42e84cd9773b2a7287.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47548785e478bc5b9591341a881e3127.png)
您最近一年使用:0次
2022-01-16更新
|
667次组卷
|
5卷引用:广西2022届高三4月大联考数学(理)试题