名校
1 . 如图,在直三棱柱
中,已知
,
分别为
的中点,求证:
![](https://img.xkw.com/dksih/QBM/2016/5/18/1572636302245888/1572636308340736/STEM/e42820684e5f483eac04c8bffa6d736c.png)
(1)平面
平面
;
(2)
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f47d6a88e962cd790d2f159c021ec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9369aed2d8309af46ac3eaffb9cce537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/473ce0e22c4edc6ef768e0c12f59e483.png)
![](https://img.xkw.com/dksih/QBM/2016/5/18/1572636302245888/1572636308340736/STEM/e42820684e5f483eac04c8bffa6d736c.png)
(1)平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac01b4d05b3a28748f2f8975ec5e11d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54f845e74c18cdb2d6a80e0c0b4e85cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faa23fa14f624ad8212bda55d321362f.png)
您最近一年使用:0次
2016-12-04更新
|
4378次组卷
|
2卷引用:2016届江苏省苏北三市高三最后一次模拟考试数学试卷
2 . 如图,在三棱台
中,
,G,H分别为AC,BC的中点.求证:
平面FGH.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8783bc74553bf44b61d999a0e4144bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5545dc3211671941048034af38092fa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/debdc6632a4877e5131d3da25cda8b89.png)
![](https://img.xkw.com/dksih/QBM/2020/1/30/2388354048933888/2389111774044160/STEM/68ca250e3b9542f4a8a62872ce208b8f.png?resizew=196)
您最近一年使用:0次
2020-01-31更新
|
499次组卷
|
2卷引用:人教B版(2019) 必修第四册 逆袭之路 第十一章 立体几何初步 11.3.3 平面与平面平行
名校
3 . 如图1,矩形
中,
,M是
边上异于端点的动点,
于点N,将矩形
沿
折叠至
处,使面
面
(如图2).点E,F满足
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/91c9d39e-9f7e-4d41-9157-5376b9d05328.png?resizew=453)
(1)证明:
面
;
(2)设
,当x为何值时,四面体
的体积最大,并求出最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9639896487e6cf18e8fd02d2a7ed2087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aab384f2520d76ed8fa01b31e09c1eea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b80a0e428cb894bfd09a6129a73ea4ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29a47ca365469c996a6b8cb47284764f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46efd4004cc47ba16d3d53b07d40b145.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0e825de4e5ade72e45a28c8f75b1dea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23b04eeb552bee53eda166bfb2b85578.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/91c9d39e-9f7e-4d41-9157-5376b9d05328.png?resizew=453)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e787bb792dcd936cb4e87023c95011b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f780ed359b94450fc80cf57e66a4ad8.png)
您最近一年使用:0次
2019-02-05更新
|
710次组卷
|
2卷引用:【全国百强校】湖北省荆州中学、宜昌一中等“荆、荆、襄、宜四地七校考试联盟”2019届高三上学期期末考试数学(文)试题
名校
4 . 已知
菱形
所在平面,
,
为线段
的中点,
为线段
上一点,且
.
![](https://img.xkw.com/dksih/QBM/2018/7/2/1979754283843584/1980598250799104/STEM/6314f252095042a286faf8fa1484fa09.png?resizew=221)
(1)求证:
平面
;
(2)若
,
,求二面角
的余弦值.
![](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/af62a8c94bdc27efa2ec03e58d9400ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da87a0b35ba0ff6d762da1be4267f640.png)
![](https://img.xkw.com/dksih/QBM/2018/7/2/1979754283843584/1980598250799104/STEM/6314f252095042a286faf8fa1484fa09.png?resizew=221)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e60db93cd34a54c98da9ff9782656c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c161375e4e6f61f1cbef8083c02e975.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e428dc8a84f07894b0c392832b18a8a.png)
您最近一年使用:0次
5 . 如图,三棱柱
的各棱长都相等,且
分别为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/e1f94cd5-e572-4cb9-a943-b4461511eb52.png?resizew=158)
(1)证明:
平面
;
(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/d791e7a754ae050dfeefbc274c8099b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c050f6a8066689b82955080d1401af14.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/e1f94cd5-e572-4cb9-a943-b4461511eb52.png?resizew=158)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063510e3c1fb6a7ccc3b8e3e3c7d660e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e53b212640dadf751ef7f65a78a209.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
您最近一年使用:0次
6 . 如图,在三棱锥P-ABC中,
,平面
平面ABC,点D在线段BC上,且
,F是线段AB的中点,点E是PD上的动点.
![](https://img.xkw.com/dksih/QBM/2020/1/2/2368566347227136/2369736597110784/STEM/42711ab1362f483a9f014e6d63b5ede0.png?resizew=225)
(1)证明:
.
(2)当EF//平面PAC时,求三棱锥C-DEF的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d0c6002354c2169ed55b41f08dd1460.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/499f02e624b84c5fa5d479d24a3ed99a.png)
![](https://img.xkw.com/dksih/QBM/2020/1/2/2368566347227136/2369736597110784/STEM/42711ab1362f483a9f014e6d63b5ede0.png?resizew=225)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b212ff4649b37b655010ef687a5f4fe.png)
(2)当EF//平面PAC时,求三棱锥C-DEF的体积.
您最近一年使用:0次
名校
解题方法
7 . 将三棱锥
与
拼接得到如图所示的多面体,其中
,
,
,
分别为
,
,
,
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/bbaa2f22-1aad-47c3-99db-f1ae79f7b059.png?resizew=186)
(1)当点
在直线
上时,证明:
平面
;
(2)若
与
均为面积为
的等边三角形,求该多面体体积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9072b69d2f0d27f940a49f1db4b27fcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c51d16ed607407429e6640ad90d75b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319a01218514917e446dfc807a625ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c08348699f7bb1069ee4ae52b7f7c4ae.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/bbaa2f22-1aad-47c3-99db-f1ae79f7b059.png?resizew=186)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19247393d6b9122742a1a926ff495314.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e13d79711f6e435beccf2ccb2247ecf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b33c2aa4cb5a3b8da3b188ab6a21520c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
您最近一年使用:0次
2020-02-18更新
|
452次组卷
|
2卷引用:2019届山西省晋城市百校联盟高三上学期第一次模拟考试数学(文)试题
解题方法
8 . 如图,在直三棱柱
中,
,
,
,
分别为棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/9508bd8c-5b44-43c5-b3e5-e2e6cbac02ca.png?resizew=180)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
平面
;
(2)若异面直线
与
所成角为
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36cf3bff56a7f4ab6c0008e90823025d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33fa098867b1d6e1aeaebe22871821fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f02795ff1af51fb0672800ceb02e7893.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5dd68e298b39454c148c7a8d951f9b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/279cce34dd995fd1c54a7629fb16c6cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4994f75d9a4056bf04228170e27a2658.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/9508bd8c-5b44-43c5-b3e5-e2e6cbac02ca.png?resizew=180)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3f84d1ed2ff6f93bf229c738c58c15c.png)
(2)若异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e17230625e72d3a9c6d72ff61019ff61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8152cb36f666908ce1a748d9f17709dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ec1ac46e3ad9d11e07fddb913c53efa.png)
您最近一年使用:0次
2018-07-11更新
|
859次组卷
|
2卷引用:【全国市级联考】湖北省黄冈市2018年春季高一期末考试文科数学试题
解题方法
9 . 如图,在棱长为a的正方体中,点M为A1B上任意一点,求证:DM∥平面CB1D1.
![](https://img.xkw.com/dksih/QBM/2020/10/10/2568104637374464/2569571144040448/STEM/c71c8b489c324a5687dbe4ee3b3213b7.png?resizew=183)
您最近一年使用:0次
2020-10-12更新
|
402次组卷
|
3卷引用:安徽省蚌埠市田家炳中学2020-2021学年高二上学期10月月考数学(文)试题
2018高三下·全国·专题练习
10 . 如图,三棱柱
中,四边形
为菱形,
,
,侧面
侧面
,
在线段
上移动(不含端点),
为棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/8/39f1dc11-ff27-4ade-9d73-5139d5359fbf.png?resizew=241)
(1)若
为线段
的中点,
为
的中点,连接
并延长交
于
,求证:
∥平面
;
(2)若二面角
的平面角的余弦值为
,且
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72f0d0e78101fef36a75b70ac7e7cf5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71995f81c022b828cf13c35228e04d8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61cdaadeae37736a1e6dd93fa1fe712f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/8/39f1dc11-ff27-4ade-9d73-5139d5359fbf.png?resizew=241)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ffba8658b0023316117e1536cbf806.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39eefa58485e43a86a1931a2aa7222a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5ec70bc9d4f8f5df312e2f09ee3bcb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab69bf5d2453d958a3ef9b5fbd5b0898.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次