解题方法
1 . 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
解题方法
2 . 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
解题方法
3 . 在如图所示的几何体中,
均为等边三角形,且平面
平面
,平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/dce9b9c1-6a0a-4572-8d28-6eee4b7c75ff.png?resizew=150)
(1)证明:
.
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5337198d46a7c109b3552ce3843668fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8dc6db50a9709c3f4d84eee7bdf1250.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c309e58bf083bad13abd549720a63a22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/dce9b9c1-6a0a-4572-8d28-6eee4b7c75ff.png?resizew=150)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe7eaf967808dad0a184eeedfa27721.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da0f73cf7ab0c2a8a0099cb2873c81f4.png)
您最近一年使用:0次
4 . 已知直三棱柱ABC-A1B1C1中,AB=AC=AA1=1,M,N分别为A1C1,AB1的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/5d1285ca-da49-4acd-8fb8-077076b47bd4.png?resizew=134)
(1)求证:MN//平面B1BCC1;
(2)若P是B1B的中点,AP⊥MN,求二面角A1-PN-M的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/5d1285ca-da49-4acd-8fb8-077076b47bd4.png?resizew=134)
(1)求证:MN//平面B1BCC1;
(2)若P是B1B的中点,AP⊥MN,求二面角A1-PN-M的余弦值.
您最近一年使用:0次
解题方法
5 . 在正方体ABCD—A1B1C1D1中,异面直线
和
分别在上底面A1B1C1D1和下底面ABCD上运动,且
,若
与
所成角为60°时,则
与侧面ADD1A1所成角的大小为( )
![](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/057cdb4057bca398a838e868efd360f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.30° | B.45° | C.60° | D.90° |
您最近一年使用:0次
2020-10-03更新
|
1524次组卷
|
6卷引用:河南省名校联盟2020-2021学年高三9月质量检测数学文科试题
河南省名校联盟2020-2021学年高三9月质量检测数学文科试题贵州省贵阳为明教育集团2021届高三第一次调研理科数学试题(已下线)专题8.7 立体几何中的向量方法(精练)-2021年新高考数学一轮复习学与练吉林省通榆县第一中学2020-2021学年高三上学期第四次质量检测数学(文)试题人教A版(2019) 选修第一册 实战演练 第一章 验收检测(已下线)专题 1.2空间向量:求距离与角度13种题型归类(2)
6 . 如图,在直三棱柱
中,点
、
分别为
和
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/dc67479f-01e4-4abd-8307-1cf201bdd9ea.png?resizew=201)
(1)证明:
平面
;
(2)若
,
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.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/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/dc67479f-01e4-4abd-8307-1cf201bdd9ea.png?resizew=201)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063510e3c1fb6a7ccc3b8e3e3c7d660e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14d355b4c58b4e883b9e65cc6da8622e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98e384e0ffc3d599303b77ee2a12221e.png)
您最近一年使用:0次
2020-09-25更新
|
932次组卷
|
3卷引用:四川省巴中市2021届高三零诊考试数学(理)试题
解题方法
7 . 如图,在三棱锥
中,
,
,
分别为棱
,
,
的中点.已知
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/3f534203-fe09-4dd5-b4da-b465d33c5f6c.png?resizew=132)
(1)证明:平面
平面
;
(2)若
,
,
为
中点,求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0d9ef979b9f27a28cbda6923e888ccc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/967f74b8993c61634ceed95edca05ffd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeedb5f361a1baff6338436fff6c471d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/3f534203-fe09-4dd5-b4da-b465d33c5f6c.png?resizew=132)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次
2020-09-05更新
|
945次组卷
|
2卷引用:新高考课改专家2021届高三数学命题卷试题
解题方法
8 . 在四棱锥
中,
平面
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2020/12/18/2617087375605760/2619659381301248/STEM/ffba5cbf-3240-4e78-bac9-a9843a20a6a0.png)
(1)若
,求证:平面
平面
;
(2)若
,
,直线
与平面
所成的角为
,求
的长.
![](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/9536a2be7b84612f45cc875a00c5a5d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e51b89f545616ef48f3706850107ad95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c42ed2e5bd5a0f033e24008697bf4963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c1ac2e11788860424508ea9e80cf89d.png)
![](https://img.xkw.com/dksih/QBM/2020/12/18/2617087375605760/2619659381301248/STEM/ffba5cbf-3240-4e78-bac9-a9843a20a6a0.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/236c134aad7d9a21c49c07e924b9a531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52a1368e0f8a22bd5d3d44d90ad3544b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36cdb8c9147912da3356b91faab10b40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
您最近一年使用:0次
名校
9 . 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
|
1352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
解题方法
10 . 如图,已知三棱台
中,平面
平面ABC,
是正三角形,侧面
是等腰梯形,
,E为AC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/1d5d0b07-4715-4680-984f-168af035c53a.png?resizew=185)
(1)求证:
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eff0db05826cbff651faf0144904b32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/923cadcb4df5a9bcec2805f4d250786f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/1d5d0b07-4715-4680-984f-168af035c53a.png?resizew=185)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc0a886f1192d450ced9fd875e78425e.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f1158eaa2e338f564eb18de5bef1d25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
您最近一年使用:0次
2020-12-04更新
|
1050次组卷
|
2卷引用:江西省南昌市八一中学、洪都中学、十七中三校2021届高三上学期期末联考数学(理)试题