解题方法
1 . 如图,在正方体
中,
、
分别为
、
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/183e2390-544e-4e27-b88d-f818d47be664.png?resizew=161)
(1)求证:
;
(2)求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.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/c08f80a9b38074366fd7a0151ff143d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2657191a56c0a9deb864763498935706.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/183e2390-544e-4e27-b88d-f818d47be664.png?resizew=161)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02a0e00113872f921116b6c0c3177d0f.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6ae72f5e5891249caa10c43224da89c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c241f900cb6ed341c137a3d71216a4.png)
您最近一年使用:0次
2 . 已知两条直线
,
和平面
,那么下列命题中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
A.若![]() ![]() ![]() | B.若![]() ![]() ![]() |
C.若![]() ![]() ![]() | D.若![]() ![]() ![]() |
您最近一年使用:0次
解题方法
3 . 如图,在三棱锥
中,侧棱
底面
,
,
、
分别是棱
、
的中点.
![](https://img.xkw.com/dksih/QBM/2020/11/3/2585234825994240/2585584311795712/STEM/e82264977d5540d8b1b28ce973780d55.png?resizew=182)
(Ⅰ)证明:
平面
;
(Ⅱ)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/2020/11/3/2585234825994240/2585584311795712/STEM/e82264977d5540d8b1b28ce973780d55.png?resizew=182)
(Ⅰ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(Ⅱ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc90fee532e50d319081d571410421.png)
您最近一年使用:0次
2020-11-04更新
|
308次组卷
|
2卷引用:江苏省盐城市东台创新高级中学2019-2020学年高一下学期5月检测数学试题
4 . 设
,
是两个平面,
、
是两条直线,下列命题中,可以判断
的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35f747152f006301e03b643afb80195c.png)
A.![]() ![]() ![]() ![]() | B.![]() ![]() ![]() |
C.![]() ![]() ![]() | D.![]() ![]() ![]() |
您最近一年使用:0次
2020-10-31更新
|
885次组卷
|
6卷引用:广东省普通高中2018-2019学年高二学业水平考试数学模拟试题(二)
广东省普通高中2018-2019学年高二学业水平考试数学模拟试题(二)(已下线)练习15+直线、平面平行的判定与性质-2020-2021学年【补习教材·寒假作业】高一数学(北师大版)(已下线)练习16+直线、平面垂直的判定与性质-2020-2021学年【补习教材·寒假作业】高一数学(北师大版)沪教版(2020) 必修第三册 达标检测 第10章 10.4 平面与平面的位置关系5.2 平面与平面垂直练习题-2021-2022学年高一下学期数学北师大版必修第二册(已下线)第06讲 空间直线﹑平面的垂直(一)-《知识解读·题型专练》
名校
5 .
,
分别为菱形
的边
,
的中点,将菱形沿对角线
折起,使点
不在平面
内,则在翻折过程中,下列选项正确的是( )
①
平面
;②异面直线
与
所成的角为定值;③在二面角
逐渐变小的过程中,三棱锥
外接球的半径先变小后变大;④若存在某个位置,使得直线
与直线
垂直,则
的取值范围是![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f00f2f6ab162f9333ec55db195d663b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/13/c94f3cdc-eca0-497e-ad0f-424a7aa8b625.png?resizew=339)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f0ac3005d5ecd6d4cea0ce99a47ef3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f00f2f6ab162f9333ec55db195d663b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/13/c94f3cdc-eca0-497e-ad0f-424a7aa8b625.png?resizew=339)
A.①② | B.①②④ | C.①④ | D.①②③④ |
您最近一年使用:0次
2020-09-01更新
|
865次组卷
|
8卷引用:四川省内江市第六中学2020届高三热身考试数学(理)试题
四川省内江市第六中学2020届高三热身考试数学(理)试题安徽省卓越县中联盟2020-2021学年高二上学期期中联考数学(理)试题(已下线)黄金卷12-【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)(已下线)必刷卷04-2021年高考数学考前信息必刷卷(江苏专用)2023年3月河北省普通高中学业水平合格性考试模拟(十)数学试题四川省成都市锦江区嘉祥外国语高级中学2023-2024学年高三上学期入学考试理科数学试题四川省成都市金牛区成都七中万达学校2023-2024学年高三上学期期中理数试题(已下线)第二章 立体几何中的计算 专题六 几何体的外接球、棱切球、内切球 微点14 多边形折叠成模型综合训练【基础版】
解题方法
6 . 如图,在三棱锥
中,
平面
,
,
,
,直线
与平面
所成的角为
,点
分别是
的中点.
![](https://img.xkw.com/dksih/QBM/2020/6/14/2484435791822848/2485269658927105/STEM/348c7cdc5c9a4674a38314ef6e5c794a.png?resizew=290)
(1)求证:
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13d28cb7181257cf732af4b615fc47d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eb3d1070981fed5ca65a34bb2282e6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97bde5efa645a4c1ed6874088400d6a7.png)
![](https://img.xkw.com/dksih/QBM/2020/6/14/2484435791822848/2485269658927105/STEM/348c7cdc5c9a4674a38314ef6e5c794a.png?resizew=290)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
您最近一年使用:0次
7 . 在三棱锥O-ABC中,已知OA,OB,OC两两垂直,OA=2,OB=
,直线AC与平面OBC所成的角为45°.
![](https://img.xkw.com/dksih/QBM/2020/3/13/2418822897991680/2419216880508928/STEM/20138ff676fb4b9b900f4d9b86f762d7.png?resizew=218)
(1)求证:OB⊥AC;
(2)求二面角O-AC-B的大小
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35361e76a7c85d1886728c8d0200b234.png)
![](https://img.xkw.com/dksih/QBM/2020/3/13/2418822897991680/2419216880508928/STEM/20138ff676fb4b9b900f4d9b86f762d7.png?resizew=218)
(1)求证:OB⊥AC;
(2)求二面角O-AC-B的大小
您最近一年使用:0次
名校
解题方法
8 . 如图.在四面体
中.
平面
且
.分别为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/7dd873dc-c039-4de4-9601-c1e76b9f2e8a.png?resizew=163)
(1)证明:
平面
;
(2)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6ef40b76bf247c6efa548cd0067a901.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a898391acfefad6656a81913f51d0255.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd0143ca5cedf56c7eaee1b053a87865.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/7dd873dc-c039-4de4-9601-c1e76b9f2e8a.png?resizew=163)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a779876cdfb2c489ad0eaed0f73e6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bbd7c2767c106faf27d6a97ebc8e739.png)
您最近一年使用:0次
2020-03-13更新
|
245次组卷
|
2卷引用:2019年12月河南省实验中学高二学业水平测试一数学试题
解题方法
9 . 已知在直三棱柱
中,
.
![](https://img.xkw.com/dksih/QBM/2020/3/12/2418141015580672/2418702611668992/STEM/9fa2bfa12e8546729dd26fd9d94d2a8d.png?resizew=187)
(1)求证:
平面
;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://img.xkw.com/dksih/QBM/2020/3/12/2418141015580672/2418702611668992/STEM/9fa2bfa12e8546729dd26fd9d94d2a8d.png?resizew=187)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78e8c4ebd49304b7f802657c00c17de0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52856669e6adf246c92923b4bb120d91.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3ffd87c80b17c3f8386aff4c54be61f.png)
您最近一年使用:0次
2020-03-13更新
|
427次组卷
|
2卷引用:2017年辽宁省普通高中学生学业水平考试数学真题
解题方法
10 . 如图(1),在
中,
,AD是边BC边上的中线,将
沿AD折起得到
,得到如图(2)所示的三棱锥
,试判断AD与
是否垂直.若垂直,请写出证明过程;若不垂直,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ff214d99784c6b23b7784bdaf3ed37a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1816fb0bed72025e79aa4b7185055ce5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe70c6135cb07a6c93b274322ee3833.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e972078521b6a9af1bf41697c3193f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/366ce8ee016c74b5cbb03e95798abbac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/020ebe1219437129358b986eb9e70bbf.png)
![](https://img.xkw.com/dksih/QBM/2020/3/12/2418141164371968/2418651287707648/STEM/a5bc4c5cc6f447ab8713f0e7b3d77b4d.png?resizew=243)
您最近一年使用:0次
2020-03-13更新
|
361次组卷
|
2卷引用:2015年辽宁省普通高中学生学业水平考试数学真题