如图,在四面体
中,E是线段
的中点,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/ec273443-bdba-42ed-9eaa-b88fa4d3ea5d.png?resizew=162)
(1)证明:
;
(2)求平面
与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bb80bf2994f71e7c74972725fd98573.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f5fc4ad65b723b6a8da4c8dac154e6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21519ccb36fd595bb21e6189d305ef1e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/ec273443-bdba-42ed-9eaa-b88fa4d3ea5d.png?resizew=162)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e7f2ab75abc366639a5ca25f6f3d951.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9a814b70236a108be5d6e7ff271fe92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/678b28fddb166d90878d24d6e5481080.png)
2020·安徽安庆·二模 查看更多[5]
2020届安徽省安庆市高三第二次模拟理科数学试题四川省成都外国语学校2019-2020学年高二下学期期中考试数学(理)试题(已下线)选择性必修第一册模块检测卷(基础过关)-2020-2021学年高二数学单元测试定心卷(人教A版2019选择性必修第一册)(已下线)第3章 空间向量与立体几何(提高卷)-2020-2021学年高二数学课时同步练(苏教版选修2-1)四川省成都市玉林中学2020-2021学年高二下学期期中数学试题
更新时间:2020-05-09 23:25:07
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,已知多面体
,
,
,
均垂直于平面
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2021/11/16/2852651028824064/2853489071775744/STEM/543f264c28d24d788a943f4c888d95e5.png?resizew=271)
(1)证明:
平面
;
(2)求直线
与平面
所成的角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68d17d14819681c455a91d7678742368.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a696a182fff038a86b2bbe8ca099442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1859959fdb4c5edd8056893f94a10a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e97fcdcfd6183b976a61ef3222c607.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a1be17e0a3e51cde1f50f384198e71e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1880586c33da315e49ccb6e2d531c6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fc07af94c2ebedcab772b2b90ff1332.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ede14ef03dc3666b8a6902ddaf0021b6.png)
![](https://img.xkw.com/dksih/QBM/2021/11/16/2852651028824064/2853489071775744/STEM/543f264c28d24d788a943f4c888d95e5.png?resizew=271)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d1d2e0f281222a5f289ea4008370aed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b16cff607cdc2d69afc70dc778acbb.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c2e84d6e368f8368f8301c4cd66d6dd.png)
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解题方法
【推荐2】如图,
是正方形,
平面
,
,
.
(1)求证:
平面
;
(2)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
平面
;
(3)求四面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8781208b8fe41342b9bd8b20456cdba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85b14529dae45519dfc3e2ee365e7b4a.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
(3)求四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f84f169e50dc59d4f7a8e1e36f5c847.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/17/274fcca6-2bad-444f-a81e-1cae968d6633.png?resizew=168)
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【推荐3】如图,在四棱锥
中,
平面
,
,
,
,
,
为
的中点.
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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4ab7e657f01bdfa235f8c4d6681d13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90d6ee72557cb3c3830212d74bca615a.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/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3db1d8f228c87b65a3609f825fc441d5.png)
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【推荐1】如图1,在等腰梯形ABCD中,
,
,
,E为AD的中点.现分别沿BE,EC将△ABE 和△ECD折起,使得平面ABE⊥平面BCE,平面ECD⊥平面BCE,连接AD,如图2.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/ad507a81-977b-4d9f-a97e-49c8cd9a6f4a.png?resizew=292)
(1)若在平面BCE内存在点G,使得GD∥平面ABE,请问点G的轨迹是什么图形?并说明理由.
(2)求平面AED与平面BCE所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ccbff99696256fd402a2efb371862c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b35e692c54294045401f8add586eaaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/645d46c17903078e0b38279353c5430d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/ad507a81-977b-4d9f-a97e-49c8cd9a6f4a.png?resizew=292)
(1)若在平面BCE内存在点G,使得GD∥平面ABE,请问点G的轨迹是什么图形?并说明理由.
(2)求平面AED与平面BCE所成锐二面角的余弦值.
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解题方法
【推荐2】【阅读材料】数学命题的推广是数学发展不可缺少的一种手段,同时也是一项富有挑战性和创造性的活动.我们知道,在
中,记角
,
,
的对边分别为
,
,
,边与角的关系满足正弦定理:
.下面是正弦定理在空间中的一种推广:在对棱分别相等的三棱锥中,侧棱和其所对二面角的正弦值之比相等.如:在三棱锥
中,若
,
,
,记
所对的二面角
的大小为
,
所对的二面角
的大小为
,
所对的二面角
的大小为
.满足:
.根据以上阅读材料,解答以下两个问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/2f1d33af-f7b7-49c4-b51a-901a8339f463.png?resizew=320)
(1)正四面体
中,已知棱长
,二面角
的大小为
,求
的值;
(2)已知长方体
中,
,
,容易得出:平面
平面
,求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1501d4035822b34fcc2378f1e316f159.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1703c9549330198bccb64a1d226eae32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5340b90363396143e0010c633a93dbf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54c12c6d0a5317038ac3eed0c32c656e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81ca12f11f39405a6a49042c5e294862.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ec2524be492bca0d1566bf848066f10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f1854ba6cc92481d7a616bd2788a47e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f435efcc7869eec21bdba1ed81dc3f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d1619c9a782aea7623c69f4f49492a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/2f1d33af-f7b7-49c4-b51a-901a8339f463.png?resizew=320)
(1)正四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca6d1c5eace748465b2dad5065f5111c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b61c9ab9f37d54b40107bcde9bbe22d.png)
(2)已知长方体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ef8866ccf160ddc441bf69c5d3a3d5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba0fbd88fdb064072eedd136e9cb41ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73845d4d663b3de0b281611fe2c762fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d4cc3c81b7ce3ce201a25394234276.png)
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【推荐1】如图,在四棱锥
中,四边形
为正方形
为等边三角形
分别是
和
的中点.
(1)求证:直线
平面
;
(2)若
求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c753cb1eb73fd8d136d00462970797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a7e7211d87f8e44dd5d61ce4f6c8ffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29560ed838ea0c239351c94d23945a2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/6/6/abc4db76-cd11-43ef-9739-9420097d6286.png?resizew=142)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d7c56ff7012053b6db5073df693800.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/422210c777ac0d625bbd81cc7601bf9b.png)
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适中
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【推荐2】如图1,梯形
中,
,过
分别作
,
,垂足分别为
、
.
,
,已知
,将梯形
沿
,
同侧折起,得空间几何体
,如图2.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/553291fa-da9c-4e3c-8d86-f6b62d70a4d7.png?resizew=282)
(1)若
,证明:
平面
;
(2)在(1)的条件下,若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37591109b0a0ec5ffe2133f83310eca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4611ceb2a28f7a7e4d24266d7f99b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1ff7bf8ffc8a04186e3e13c1a6d5ced.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9db203a75be4335050febf55bc53d596.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b515965c22d2950b592c096c6e3bdfd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82773737609e65dea3c5c67099f1b10d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/535770901287f244911b42412533d4a9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/553291fa-da9c-4e3c-8d86-f6b62d70a4d7.png?resizew=282)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e39b13d187b25461d85a3b8d10c7b678.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
(2)在(1)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0446a2f32a4e10b5cddfb3af6a863f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5680c88274fe3de009b76721b1128e0d.png)
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【推荐3】如图,已知直三棱柱
的底面为正三角形,侧棱长都为4,
、
、
分别在棱
、
、
上,且
,
,
,过
,
的中点M,N且与直线
平行的平面截多面体
所得的截面
为该多面体的一个中截面.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/b326fe73-b78d-4bf5-b26b-9ce6ee16e4a1.png?resizew=139)
(1)证明:中截面
是梯形;
(2)若直线
与平面
所成的角为45°,求平面
与平面
所成锐二面角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a7f91368316fadceb5a47b5c45df297.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b09b10f662479431978074c1a99f6b65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6903e31448cfcdda8e6f24c11ef844b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c8b7a498f2fa0820ad123a8756ce64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92777fd37c34b8747686db17b0098419.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b3fd6251ce7dd1c0dd86339c35ee729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63377f17464dd3675c605204efa7869a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b09b10f662479431978074c1a99f6b65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afab03feeb147d86341c118c5e4d1e85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/b326fe73-b78d-4bf5-b26b-9ce6ee16e4a1.png?resizew=139)
(1)证明:中截面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24dc97d6060d7bdcd077a4803545ec77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b16cff607cdc2d69afc70dc778acbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24dc97d6060d7bdcd077a4803545ec77.png)
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