名校
解题方法
1 . 如图所示,四棱锥
中,底面ABCD为矩形,AC与BD交于点O,点E在线段SD上,且
平面SAB,二面角
,
均为直二面角.
![](https://img.xkw.com/dksih/QBM/2022/3/23/2942625628897280/2943809138499584/STEM/e3dd3001e34b4e03a8faf99fec022e96.png?resizew=323)
(1)求证:
;
(2)若
,且钝二面角
的余弦值为
,求AB的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/130dfae4030f106b434a3797d4df0871.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7fe637f1537666932491637f9b3d3ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bfae15acb0bb08e8d3f28cc204bff37.png)
![](https://img.xkw.com/dksih/QBM/2022/3/23/2942625628897280/2943809138499584/STEM/e3dd3001e34b4e03a8faf99fec022e96.png?resizew=323)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a318f83f8eac0280cf78f555d3cd13ef.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46ff87836403b4cf4f728d5ac4d2c87a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a351d71fa01d3f5920e374a8ee7b524.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa024fb7a5bfc2847a824f35eca6785.png)
您最近一年使用:0次
2022-03-25更新
|
2532次组卷
|
6卷引用:河南省信阳高级中学2021-2022学年高二下学期4月月考数学(理)试题
河南省信阳高级中学2021-2022学年高二下学期4月月考数学(理)试题华大新高考联盟2022届高三3月教学质量测评(新高考卷)数学试题华大联考2022届高三3月教学质量测评理科数学试题(已下线)秘籍05 空间向量与立体几何-备战2022年高考数学抢分秘籍(新高考专用)河北省衡水中学2022届高考一模数学试题云南省大理州鹤庆县第三中学2023届高三上学期第二次月考数学试题
2 . 如图,在三棱锥A-BCD中,AD⊥平面BCD,∠BDC=120°,
,AD=BD=2,E,F,G分别是BD,AD,AC的中点,平面EFG与BC交于H.
![](https://img.xkw.com/dksih/QBM/2022/3/8/2931921006346240/2939424742236160/STEM/739698966f854720b2f7607762db907f.png?resizew=164)
(1)在BC上确定H的位置,并证明FH⊥EG;
(2)求平面EFG与平面BCD所成的锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921a71040d18df8b33bc41995675a586.png)
![](https://img.xkw.com/dksih/QBM/2022/3/8/2931921006346240/2939424742236160/STEM/739698966f854720b2f7607762db907f.png?resizew=164)
(1)在BC上确定H的位置,并证明FH⊥EG;
(2)求平面EFG与平面BCD所成的锐二面角的余弦值.
您最近一年使用:0次
解题方法
3 . 如图,在三棱锥A-BCD中,AD⊥平面BCD,∠BDC=90°,
,AD=BD=2,E,F,G分别是BD,AD,AC的中点,平面EFG与BC交于H.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/5/0c5aa1cf-c42d-478f-bcc4-ffc045b1b957.png?resizew=181)
(1)在BC上确定H的位置,并证明FH⊥EG;
(2)求四棱锥A-EFGH的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921a71040d18df8b33bc41995675a586.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/5/0c5aa1cf-c42d-478f-bcc4-ffc045b1b957.png?resizew=181)
(1)在BC上确定H的位置,并证明FH⊥EG;
(2)求四棱锥A-EFGH的体积.
您最近一年使用:0次
解题方法
4 . 如图所示的直四棱柱
中,底面ABCD是边长为2的正方形,E,F分别是棱BC,CD上的点,且BE=2EC,DF=2FC,
,G在棱
上,
为上底面的中心,
平面EFG.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/57e667d5-bb15-4e06-98e1-41a923973887.png?resizew=176)
(1)求
的值;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d927585a17c2e98ef7d5a9589a26ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32adecb9a07c569ef65838c6e5bb0f8e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/57e667d5-bb15-4e06-98e1-41a923973887.png?resizew=176)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf862cbb883e62d7651d251d4cc80866.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f57b9f9e76e84ed6b1389429663ca791.png)
您最近一年使用:0次
名校
解题方法
5 . 在三棱锥A-BCD中,E,F分别是棱BC,CD上的点,且
平面ABD.
![](https://img.xkw.com/dksih/QBM/2021/12/26/2887270960095232/2927470886961152/STEM/12f3d43a-0b22-4d9f-8b9a-39d8d7f9afaa.png?resizew=194)
(1)求证:
平面AEF;
(2)若
平面BCD,
,
,记三棱锥F-ACE与三棱锥F-ADE的体积分别为
,
,且
,求三棱锥B-ADF的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7a407b262c22419f73396170ecdc849.png)
![](https://img.xkw.com/dksih/QBM/2021/12/26/2887270960095232/2927470886961152/STEM/12f3d43a-0b22-4d9f-8b9a-39d8d7f9afaa.png?resizew=194)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e3c0430146b7b8d40ebb721a4d0de19.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd657e48b15b9b54a55817e2c26b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dac9a2626064adb81edc2bbf36cb1d65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4764374bd2fb78e59cd0b283637baeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63055a5d6916f99d07fede49120753f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e449727158281e3370255436481a848.png)
您最近一年使用:0次
2022-03-02更新
|
1230次组卷
|
7卷引用:河南省郑州市第一〇六高级中学2021-2022学年高三上学期期中数学(文)试题
名校
解题方法
6 . 如图,正方体
的棱长为1,
,
分别是棱
,
的中点,过直线
的平面分别与棱
,
交于点
,
,设
,给出下列四个结论:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/922c5d63-0eb3-4ee6-9681-2e41157d8945.png?resizew=165)
①四边形
一定为菱形;
②若四边形
的面积为
,
,则
有最大值;
③若四棱锥
的体积为
,
,则
为单调函数;
④设
与
交于点
,连接
,在线段
上取点
,在线段
上取点
,则
的最小值为
.
其中所有正确结论的序号是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3da8c338342e38c9aa3f274c053fd5b.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/6024fd4532f5f981deac4582c799a6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ecac2dad4cffdd971fd23deacff3fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b25f3ea33cc08b1e2a0d9c3a9dccaf.png)
![](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/91f2a9b923a355694ea487f6c5669a04.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/922c5d63-0eb3-4ee6-9681-2e41157d8945.png?resizew=165)
①四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65e92eac740953aa383be636ea90fd47.png)
②若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65e92eac740953aa383be636ea90fd47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f56fa5f9c9f324859bde42ee3ca620db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c7b69e93488fcd2a195cb9793e94fc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
③若四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b941daa059b04aab552429ae22a1661d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/201cc22f3d6ba9fa2b9105086939692f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31dcf3dd29fb1df05825fb4db8e53aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
④设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0f0ccc8492a0ccf1eee24867060643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffb952f86442845da723fd291564484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32b435d7fc33860ae191f9111d880b40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32b435d7fc33860ae191f9111d880b40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284750727aa2c32b2477d126daefb329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a18799306b1ed4d93066f569a14513d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0998c9ee1ed743a010cd977ff3e5549.png)
其中所有正确结论的序号是
您最近一年使用:0次
2022-02-28更新
|
1145次组卷
|
5卷引用:河南省洛阳市洛宁县第一高级中学2022-2023学年高二上学期9月月考数学试题
河南省洛阳市洛宁县第一高级中学2022-2023学年高二上学期9月月考数学试题北京市中国人民大学附属中学2022届高三2月自主复习检测练习(开学测)数学试题(已下线)思想03 数形结合思想(练)--第三篇 思想方法篇-《2022年高考数学二轮复习讲练测(新高考·全国卷)》(已下线)第24节 直线、平面平行的判定与性质-备战2023年高考数学一轮复习考点帮(全国通用)(已下线)第二章 立体几何中的计算 专题七 空间范围与最值问题 微点2 线段、距离、周长的范围与最值问题(二)【基础版】
7 . 已知正方体
的棱长为2,M为
的中点,N为
的中点,过
的平面
与DM,
都平行,则平面
截正方体所得截面的面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a604466a9c8d10d557b3dfc43b547065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
A.4 | B.![]() | C.5 | D.![]() |
您最近一年使用:0次
解题方法
8 . 如图,在三棱锥
中,侧面PBC是边长为2的等边三角形,M,N分别为AB,AP的中点.过MN的平面与侧面PBC交于EF.
![](https://img.xkw.com/dksih/QBM/2022/2/11/2914343668678656/2916025436127232/STEM/97dfb24a-74b3-444d-880a-0990de8a04e5.png?resizew=241)
(1)求证:
;
(2)若平面
平面ABC,
,求直线PB与平面PAC所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://img.xkw.com/dksih/QBM/2022/2/11/2914343668678656/2916025436127232/STEM/97dfb24a-74b3-444d-880a-0990de8a04e5.png?resizew=241)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e928a9ffb945be8dba82a6f9c2c7294d.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a3fd5284e160896f07ce367645fd04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e4f0c1c9cca0555906d8a53e1a6803d.png)
您最近一年使用:0次
名校
解题方法
9 . 已知α,β是两个不同的平面,m,n是两条不同的直线,则下列说法中正确的是( )
A.如果m⊥n,m⊥α,n⊥β,那么α⊥β |
B.如果m⊂α,α∥β,那么m∥β |
C.如果α∩β=l,m∥α,那么m∥l |
D.如果m⊥n,m⊥α,n![]() |
您最近一年使用:0次
2022-02-11更新
|
414次组卷
|
4卷引用:河南省信阳高级中学2023-2024学年高一下学期5月期中测试数学试题(二)
名校
解题方法
10 . 已知
,
是两条不同的直线,
,
是两个不同的平面,下列说法:
①若
,
,
,则直线
与
可能平行;
②若
,
,
,则直线
与
可能相交、平行或异面;
③若
,
,则直线
与
一定垂直;
④若
,
,
,则直线
与
一定平行.
以上说法正确的是___________ .(填序号)
![](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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5986f2991d45fbf3578f08f27d9fd7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/539a38ada26356d73024fb8533449c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209323a7a4d015f7e570ec578c1731f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fe920cd78db25f5b4df37d066e57800.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a53cd751c44ad4d9ebd8e3243e751321.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5986f2991d45fbf3578f08f27d9fd7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fe920cd78db25f5b4df37d066e57800.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d141538069dac9273b65b9a26ff5821.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/539a38ada26356d73024fb8533449c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209323a7a4d015f7e570ec578c1731f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b303b1f07604f5303aea94df7f0518e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
以上说法正确的是
您最近一年使用:0次