解题方法
1 . 如图,在四棱锥
中,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2021/1/22/2641740902203392/2641843068469248/STEM/a1a986474d744330b482cda46ce611e0.png?resizew=245)
(Ⅰ)求证:
平面
;
(Ⅱ)求平面
与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6037bba27008abc96a6dba99753549ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db27b7f29d7d01b2692f217bc3079fc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbb05b8b630052ff544249ebd72d95d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1074c943acd591413af464a28c285f05.png)
![](https://img.xkw.com/dksih/QBM/2021/1/22/2641740902203392/2641843068469248/STEM/a1a986474d744330b482cda46ce611e0.png?resizew=245)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/963a91995abd4927d75406d16e10a81f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(Ⅱ)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
您最近一年使用:0次
名校
2 . 如图,在四棱锥
中,底面
是矩形,
平面
,
,点E、M分别在线段
、
上,且
,连接
,延长
与
的延长线交于点F,连接
,
.
![](https://img.xkw.com/dksih/QBM/2021/10/17/2831075522772992/2833959570628608/STEM/d3c94f7d1d914952bca1cfcc79068ed6.png?resizew=337)
(1)求证:
平面
;
(2)若
时,求平面
与平面
所成角的正弦值;
(3)若直线
与平面
所成角的正切值为
,求
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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a48a7409e1a2071eccd3a0a0ac1699d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/251eb070e41f6efcdf988c717bb252f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://img.xkw.com/dksih/QBM/2021/10/17/2831075522772992/2833959570628608/STEM/d3c94f7d1d914952bca1cfcc79068ed6.png?resizew=337)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb841d975d5c7ab05598040e99df6825.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0901e2f5cefe6468cbbcaa332287d63.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3cf0f585938ede9eca890a6eb326d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bec7e56107b5f2f34e420caffd1159b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d246f9eceab371ebf47a47c2f11a4ad.png)
(3)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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3 . 如图,三棱柱
中,
侧面
,已知
,
,
,点E是棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/21/1941582f-9b4b-402d-a854-595f38408e1a.png?resizew=163)
(1)求证:
平面ABC;
(2)在棱CA上是否存在一点M,使得EM与平面
所成角的正弦值为
,若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bec738fd1916032dff2b93f84f039404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7932b50fa677dfcd8e3b5061a90c133.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e97fcdcfd6183b976a61ef3222c607.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/21/1941582f-9b4b-402d-a854-595f38408e1a.png?resizew=163)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06ad7c180d6d084ecb25f23cb6fe9b10.png)
(2)在棱CA上是否存在一点M,使得EM与平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/914d46f7e72b55d2ff3d9bc38e02b31d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff0f4f8e3032f67e672b63791cc4d9df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee7e6f1b753b73381b71eb5f8cc7da42.png)
您最近一年使用:0次
2020-03-10更新
|
1318次组卷
|
13卷引用:2020届广东省广州市执信中学高三2月月考数学(理)试题
2020届广东省广州市执信中学高三2月月考数学(理)试题2020届山东省济宁市嘉祥一中高三下学期第一次质量检测数学试题2020届陕西省西安市西北工业大学附中高三下学期4月适应性测试数学(理)试题广东省深圳市盐田区深圳外国语学校2021届高三上学期1月月考数学试题黑龙江省哈尔滨市第六中学2021届高三12月月考数学(理)试题广东省广州市执信中学2021届高三上学期第四次月考数学试题甘肃省嘉陵关市第一中学2020-2021学年高三下学期四模考试数学(理)试题四川省射洪中学校2020-2021学年高二上学期第三次月考数学(理)试题重庆实验外国语学校2020-2021学年高二下学期6月月考数学试题湖北省武汉市部分重点中学2021-2022学年高二上学期期中联考数学试题贵州省毕节市第一中学2021-2022学年高二上学期第二次阶段性考试数学(理)试题江苏省连云港市赣榆智贤中学2022-2023学年高二下学期3月学情检测数学试题湖北省武汉市华中科技大学附属中学2022-2023学年高二上学期9月月考数学试题
名校
解题方法
4 . 如图,直三棱柱
的侧面
为矩形,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/23997beb-41bf-456a-a3e3-94d5e9f4e633.png?resizew=160)
(1)求证:平面
平面
;
(2)设
为
的中点,求平面
与平面
所成锐角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe236a434aa88e5633ea61574d1bed8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/23997beb-41bf-456a-a3e3-94d5e9f4e633.png?resizew=160)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/140088b0cb73812aa9d523c44559298a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b94e97d085cea077cb82a0b7d2f523e.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea848cd2aa3a464618020475097949fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73845d4d663b3de0b281611fe2c762fe.png)
您最近一年使用:0次
2021-09-09更新
|
960次组卷
|
2卷引用:四川省成都市蒲江县蒲江中学2020年高三上学期11月月考数学(理)试题
5 . 如图,在矩形ABCD中,AB=2,AD=1,M为AB的中点,将△ADM沿DM翻折.在翻折过程中,当二面角A—BC—D的平面角最大时,其正切值为
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/cbe536ca-a00b-40ec-b869-b65db23e8acc.png?resizew=388)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/cbe536ca-a00b-40ec-b869-b65db23e8acc.png?resizew=388)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2019-01-21更新
|
1905次组卷
|
9卷引用:【市级联考】浙江省台州市2019届高三上学期期末质量评估数学试题
【市级联考】浙江省台州市2019届高三上学期期末质量评估数学试题(已下线)专题12 点线面的位置关系与空间的角-2021年浙江省高考数学命题规律大揭秘【学科网名师堂】(已下线)思想01 函数与方程思想 第三篇 思想方法篇(讲) 2021年高考二轮复习讲练测(浙江专用)浙江省绍兴市春晖中学2022届高三下学期5月高考适应性考试数学试题安徽省六安市第一中学2024届高三上学期12月月考数学试题安徽省六安第一中学2024届高三下学期第四次月考数学试题(已下线)【新东方】杭州新东方高中数学试卷387浙大附中玉泉、丁兰2022-2023学年高二上学期期中数学试题浙江省武义第一中学2023-2024学年高二上学期11月检测1数学试题
解题方法
6 . 如图,三棱锥
中,
,
,
是等边三角形,E为
三等分点(靠近C点).
![](https://img.xkw.com/dksih/QBM/2021/2/14/2657961818071040/2658478787354624/STEM/19cce046fa5c43e2bab5c612a1883c5b.png?resizew=276)
(Ⅰ)求证:
;
(Ⅱ)当
时,求
与平面
所成线面角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f80137ee8af4684ce558242d8b3f1459.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e13c772461aef1d9d715129636739748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0005e1ef60f6ddc5f9a83e3de1ef3b2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2021/2/14/2657961818071040/2658478787354624/STEM/19cce046fa5c43e2bab5c612a1883c5b.png?resizew=276)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4999d4fbcbe15f78c29d518f25d317c2.png)
(Ⅱ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75a2bdadae954b8eb129f2bef8d0a263.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
您最近一年使用:0次
名校
7 . 如图四棱锥
中,底面
为矩形,
底面
,点
分别是棱
的中点
![](https://img.xkw.com/dksih/QBM/2020/12/2/2605425608286208/2608434565734400/STEM/f0051fef463c4855b1d5e15949ea0d41.png?resizew=190)
(1)求证![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40c568d0ca4910fba8cb12fe3746d740.png)
(2)设
,求二面角
的平面角的余弦值.
![](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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24074a80e07e8e533e4120ecc8f6ef0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589c3cc1f331dbb2248b0829039df7f3.png)
![](https://img.xkw.com/dksih/QBM/2020/12/2/2605425608286208/2608434565734400/STEM/f0051fef463c4855b1d5e15949ea0d41.png?resizew=190)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40c568d0ca4910fba8cb12fe3746d740.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f323421adf8083d252f0070f54f3a80.png)
您最近一年使用:0次
2020-12-06更新
|
1353次组卷
|
3卷引用:四川省师范大学附属中学2020-2021学年高三上学期期中数学(理)试题
四川省师范大学附属中学2020-2021学年高三上学期期中数学(理)试题(已下线)黄金卷03-【赢在高考·黄金20卷】备战2021年高考数学全真模拟卷(山东高考专用)云南省玉溪第二中学2020-2021学年高二下学期第一次月考数学(理)试题
名校
8 . 在直三棱柱
中,
,
,
.
![](https://img.xkw.com/dksih/QBM/2020/1/30/2388075787395072/2388333493370880/STEM/b6e4d987d5ce4479904249a01efb50a2.png?resizew=205)
(1)求异面直线
与
所成角的正切值;
(2)求直线
与平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af260e0d98c95d1e092dc4c6d348e3ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829018a6ca0aff95d89e3f7cd943274e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41fd676c41d2d644928f014b0fea4689.png)
![](https://img.xkw.com/dksih/QBM/2020/1/30/2388075787395072/2388333493370880/STEM/b6e4d987d5ce4479904249a01efb50a2.png?resizew=205)
(1)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
您最近一年使用:0次
2020-01-30更新
|
1297次组卷
|
4卷引用:2020届黑龙江省牡丹江市爱民区第一高级中学高三上学期期末数学(理)试题
名校
9 . 如图,在直三棱柱
中,
,且
,
是
,
的交点,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/262f1e48-8968-4cf0-bd37-d8adc4296db6.png?resizew=247)
(1)求证:
平面
;
(2)求平面
与平面
夹角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e96a6b20a35af7755e5d90789ea862da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/262f1e48-8968-4cf0-bd37-d8adc4296db6.png?resizew=247)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93cf663ee2bf1ac5c43f4306fa0cf250.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ef671ff46a372d5351b8c2f9eb26b48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
您最近一年使用:0次
10 . 如图四棱柱
中,
,
,
,M为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/8be08be5-ebae-49f1-8fe8-364c81f6ec7d.png?resizew=204)
(1)证明:
平面
;
(2)若四边形
是菱形,且面
面
,
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f28ca4930b132289a485903ad9f1b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/8be08be5-ebae-49f1-8fe8-364c81f6ec7d.png?resizew=204)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5865d488a9cf1181016fd2e866177cdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
(2)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce04b35c265cc9c48b60204bd2f718ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef6eb4cbf412b69b098716b26151fba3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fa2fb03002a3c4e58c4bf3c81a22c7a.png)
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