如图,在直三棱柱
中,
,
,
,
为棱
上靠近
的三等分点,
为棱
上靠近
的三等分点.
平面
;
(2)在棱
上是否存在点D,使得
面
?若存在,求出
的大小并证明;若不存在,说明理由.
![](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/e8d927585a17c2e98ef7d5a9589a26ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
(2)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/762b8cac66d86a013ba839266b023e54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e06947327f4c41340b8713e8a6b4c87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87cdc08e1c4a04a18d5ecea03393e36d.png)
21-22高一下·江西景德镇·期末 查看更多[8]
江西省景德镇一中2021-2022学年高一(普通班)下学期期末考数学试题(已下线)高考新题型-立体几何初步(已下线)8.5.2 直线与平面平行(分层作业)-【上好课】2022-2023学年高一数学同步备课系列(人教A版2019必修第二册)(已下线)8.6.2 直线与平面垂直(精讲)(已下线)高一下学期期末考点大通关真题精选100题(2)-期中期末考点大串讲(已下线)核心考点07空间直线、平面的平行-【满分全攻略】2022-2023学年高一数学下学期核心考点+重难点讲练与测试(人教A版2019必修第二册)(已下线)专题6-3立体几何大题综合归类-1(已下线)8.6.2 直线与平面垂直【第三课】“上好三节课,做好三套题“高中数学素养晋级之路
更新时间:2022-07-15 10:31:35
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相似题推荐
解答题-证明题
|
适中
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【推荐1】直三棱柱ABC-A1B1C1中,
,点E、F、G分别是AA1、AC、BB1的中点,且CG⊥C1G.
![](https://img.xkw.com/dksih/QBM/2018/4/16/1925359588679680/1930352799735808/STEM/2c12d794faa44065bfd1e23ad1eea5a2.png?resizew=154)
(1)求证:CG//面BEF;
(2)求证:面BEF⊥面A1C1G.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://img.xkw.com/dksih/QBM/2018/4/16/1925359588679680/1930352799735808/STEM/2c12d794faa44065bfd1e23ad1eea5a2.png?resizew=154)
(1)求证:CG//面BEF;
(2)求证:面BEF⊥面A1C1G.
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【推荐2】如图是某直三棱柱(侧棱与底面垂直)被削去上底后的直观图与三视图的侧视图、俯视图,在直观图中,
是
的中点,侧视图是直角梯形,俯视图是等腰直角三角形,有关数据如图所示.
(Ⅰ)求出该几何体的体积.
(Ⅱ)若
是
的中点,求证:
平面
;
(Ⅲ)求证:平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(Ⅰ)求出该几何体的体积.
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/2012/5/8/1570850637766656/1570850643206144/STEM/911810ebd3ea43a6a1a361ade8e49da9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/250833a6c405ffd724b673b478c22919.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d3f4156473d86ce03ca64bd17f9dad6.png)
(Ⅲ)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3547a914468b082d8d8741b974a03190.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/6/190efbe5-94b4-4f4e-88a5-7d29a9b78e03.png?resizew=233)
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解答题-证明题
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【推荐3】如图,在四棱锥
中,
底面ABCD,底面ABCD为正方形,
,E,F,M分别是PB,CD,PD的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/17/c14484f1-c032-49cf-b6d2-c92a6113e420.png?resizew=170)
(1)证明:
平面PAD.
(2)求平面AMF与平面EMF的夹角的余弦值.
![](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/829f9180ddd9aa1a0ee0dc520f4e0b5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/17/c14484f1-c032-49cf-b6d2-c92a6113e420.png?resizew=170)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
(2)求平面AMF与平面EMF的夹角的余弦值.
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【推荐1】如图平面PAC⊥平面ABC, AC⊥BC,PE// BC,M,N分别是AE,AP的中点,且△PAC是边长为2的等边三角形,BC=3,PE =2.
![](https://img.xkw.com/dksih/QBM/2020/5/30/2474113875812352/2474683089608704/STEM/451eaa333a08457aa1abf69180cab99d.png?resizew=220)
(1)求证:MN⊥平面PAC;
(2)求平面PAE与平面ABC夹角的余弦值.
![](https://img.xkw.com/dksih/QBM/2020/5/30/2474113875812352/2474683089608704/STEM/451eaa333a08457aa1abf69180cab99d.png?resizew=220)
(1)求证:MN⊥平面PAC;
(2)求平面PAE与平面ABC夹角的余弦值.
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【推荐2】如图,已知四棱锥
中,
,
是面积为
的等边三角形且
,
.
![](https://img.xkw.com/dksih/QBM/2023/4/25/3224242028453888/3224881581686784/STEM/2e789f6eb6794a72ad30d03017a486ce.png?resizew=143)
(1)证明:
;
(2)求平面
与平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b8398b5298b351b99c6fdb3bacb7789.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72e49817548cb45b3d1e58570644c6fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb0db0c8c435ec8f213929939bdb5db9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e306e30d3159e4a68435c3fcfc8da693.png)
![](https://img.xkw.com/dksih/QBM/2023/4/25/3224242028453888/3224881581686784/STEM/2e789f6eb6794a72ad30d03017a486ce.png?resizew=143)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5578cd49feb7c846f087b041371c3875.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03f66ca0649c3ea95df9c98682cc6d66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ef796b46e68fe77b117ff0483d2370c.png)
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解题方法
【推荐1】如图,四棱锥P-ABCD中,底面ABCD是正方形,PD⊥平面ABCD,
,E、F分别是PC、AD中点.
![](https://img.xkw.com/dksih/QBM/2022/7/7/3017587502268416/3018367612116992/STEM/a7cc00d606ed439a85a676ecc54a5a95.png?resizew=175)
(1)求直线DE和PF夹角的余弦值;
(2)求点E到平面PBF的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99926bf272cd757f0985c69b390ebcce.png)
![](https://img.xkw.com/dksih/QBM/2022/7/7/3017587502268416/3018367612116992/STEM/a7cc00d606ed439a85a676ecc54a5a95.png?resizew=175)
(1)求直线DE和PF夹角的余弦值;
(2)求点E到平面PBF的距离.
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【推荐2】如图,在直三棱柱ABC﹣A1B1C1中,∠ACB=90°,AC=BC=2,D,E分别为棱AB,BC的中点,M为棱AA1的中点.
![](https://img.xkw.com/dksih/QBM/2020/1/16/2378401059397632/2379507301629952/STEM/d1fa5cf0f2334ab09f424674a62106ff.png?resizew=147)
(1)证明:A1B1⊥C1D;
(2)若AA1=4,求三棱锥A﹣MDE的体积.
![](https://img.xkw.com/dksih/QBM/2020/1/16/2378401059397632/2379507301629952/STEM/d1fa5cf0f2334ab09f424674a62106ff.png?resizew=147)
(1)证明:A1B1⊥C1D;
(2)若AA1=4,求三棱锥A﹣MDE的体积.
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【推荐3】如图,在四棱锥
中,底面
是平行四边形,
,
,
,
,
,
分别为
,
的中点,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b0849016506bbcf052981f9cf25ab06.png)
![](https://img.xkw.com/dksih/QBM/2021/8/31/2797809120796672/2798733108690944/STEM/eef71ae0-718a-41db-9570-bf13e74cb0d3.png?resizew=268)
(1)证明:
;
(2)求直线
与平面
所成角的正弦值.
![](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/0aedf65d7d930fdb972d4802c0dea8b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bb28f1ebbdcd6c304d8a8d0ea28aae0.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f9425630dcfe5a824c44904d4f71e13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b0849016506bbcf052981f9cf25ab06.png)
![](https://img.xkw.com/dksih/QBM/2021/8/31/2797809120796672/2798733108690944/STEM/eef71ae0-718a-41db-9570-bf13e74cb0d3.png?resizew=268)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98f1c54b7a2afc6bcab38ddd209f60d5.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c52b9478a450d15ff31eb1212a39ee6.png)
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