1 . 正△ABC的边长为4,CD是AB边上的高,E,F分别是AC和BC边的中点,现将△ABC沿CD翻折成直二面角A—DC—B.
(I)试判断直线AB与平面DEF的位置关系,并说明理由;
(II)求二面角E—DF—C的余弦值;
(III)在线段BC上是否存在一点P,使AP⊥DE?证明你的结论.
(I)试判断直线AB与平面DEF的位置关系,并说明理由;
(II)求二面角E—DF—C的余弦值;
(III)在线段BC上是否存在一点P,使AP⊥DE?证明你的结论.
![](https://img.xkw.com/dksih/QBM/2012/2/15/1570738336088064/1570738341740544/STEM/422e7f3045234147a950f9fd9a795077.png?resizew=474)
您最近一年使用:0次
2016-12-01更新
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916次组卷
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13卷引用:2016届吉林省实验中学高三上学期第一次模拟理科数学试卷1
2016届吉林省实验中学高三上学期第一次模拟理科数学试卷12016届吉林省实验中学高三上学期第一次模拟理科数学试卷2(已下线)2010年北京东城区高三上学期理科数学综合练习(一)(已下线)2010年河南省卫辉市第一中学高二上学期一月月考数学文卷(已下线)2011年福建师大附中高二第一学期期末数学理卷(已下线)2011届浙江省绍兴一中高三下学期回头考试数学理卷(已下线)2010-2011届重庆市主城八区高三第二次学业调研抽测文科数学卷(已下线)2011-2012学年重庆市万州二中高二上学期期中理科数学试卷(已下线)2012届浙江省台州市台州中学高三第一学期第二次统练试题理科数学(已下线)2012届安徽省马鞍山市高三第一次月考理科数学试卷(已下线)专题09 立体几何(练)-2021年高考数学二轮复习讲练测(文理通用)(理科)河北省石家庄市二十二中2021-2022学年高二上学期期中(11月)数学试题浙江省山河联盟2021-2022学年高二上学期12月联考数学试题
解题方法
2 . 如图,在直四棱柱
中,底面四边形
是直角梯形,其中
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/10/20036beb-06de-45f2-a6df-42441a4d94c5.png?resizew=229)
(1)求证:直线
平面
;
(2)试求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8bbc9f369f0eb01aa216d8e728d985b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/10/20036beb-06de-45f2-a6df-42441a4d94c5.png?resizew=229)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/762b8cac66d86a013ba839266b023e54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7977ab975efa6411cc17de39be70d9.png)
(2)试求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/658c43c2ff8aa0beb27938926a386695.png)
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2017-04-01更新
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2卷引用:2017届吉林省吉林市普通高中高三下学期第三次调研测试数学(文)试卷
名校
解题方法
3 . 某产品的包装纸可类比如图所示的平面图形,其可看作是由正方形
和等腰梯形
拼成,已知
,
,在包装的过程中,沿着
将正方形
折起,直至
,得到多面体
,
分别为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/b35bc6e1-5319-492e-844a-a1e834d6f0cd.png?resizew=286)
(1)证明:
平面
;
(2)求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cc6fd59aca9984b6e13354749339823.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66a388e2ef14c62b3c4f5e49e71ea3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cc6fd59aca9984b6e13354749339823.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df6e8ba43e369aba34dacbf1ee040556.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65d0dbca4c6e895ac7dfa04f47eaa78e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd24b8b3ad430ba67f8e79512b44f703.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/b35bc6e1-5319-492e-844a-a1e834d6f0cd.png?resizew=286)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7592c4f01c8e06c7ee90df5b9413a9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cc6fd59aca9984b6e13354749339823.png)
(2)求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f71ea64c4783b36659e62bb8cbf07eb7.png)
您最近一年使用:0次
4 . 在棱长为2的正方体
中,若在线段
和线段
上分别取点E,F,使得直线
平面
,则EF的长的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e539f26ed5e0b20ff7220559324869a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b4cd2b33bd983a9ed6575b9de04a46a.png)
A.![]() | B.1 | C.![]() | D.![]() |
您最近一年使用:0次
解题方法
5 . 已知四棱锥
中,底面为矩形,
底面
,
,
为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/9/19a23b04-4568-48ba-8167-b0579df84fef.png?resizew=250)
(1)在图中作出平面
与
的交点
,并指出点
所在位置(不要求给出理由);
(2)在线段
上是否存在一点
,使得直线
与平面
所成角的正弦值为
,若存在,请说明点
的位置;若不存在,请说明理由;
(3)求二面角
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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd893c4964b7f1ef69f0563d74c76d0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbbb48c435c1ea5452cd9c9dd05e53ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/9/19a23b04-4568-48ba-8167-b0579df84fef.png?resizew=250)
(1)在图中作出平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ddb7c2ca1b6bee86cb24fed02e40da2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ddb7c2ca1b6bee86cb24fed02e40da2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d83fb9ac8a18e78a4c56da79514b5ccb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f36a631b790fbfabb6a41f44c7445126.png)
您最近一年使用:0次
解题方法
6 . 如图,矩形ABCD中,BC=2,AB=1,PA⊥平面ABCD,BE∥PA,BE=
PA,F为PA的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/6/57a1f467-bdd9-4835-baf7-01dee2d87eed.png?resizew=180)
(1)求证:DF∥平面PEC;
(2)记四棱锥C-PABE的体积为V1,三棱锥P-ACD的体积为V2,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cfa1e7ffae662aefb49a44c52d4954d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/6/57a1f467-bdd9-4835-baf7-01dee2d87eed.png?resizew=180)
(1)求证:DF∥平面PEC;
(2)记四棱锥C-PABE的体积为V1,三棱锥P-ACD的体积为V2,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f737b04ce09bc7e1ed86dc9b3c85203b.png)
您最近一年使用:0次
2016-12-04更新
|
542次组卷
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5卷引用:2015-2016学年吉林省吉林一中高一上11月月考数学试卷
解题方法
7 . 如图,在四面体
中,
,
,点
,
分别是
,
的中点.
(1)求证:直线
平面
;
(2)求证: 平面
平面
;
(3)若平面
平面
且
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a651eb577dbada1f29590e558d6f9fa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650c6c818df102a83ce5159e3208d01a.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
(2)求证: 平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/557e120c066e17ba3eee00410cbed573.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
(3)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf6dc837ae85207789b94d109c5c2eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/946470cef32a0bd769b3809351d8ee61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67f207ea20f21ecde2abbfe27f4c94c6.png)
![](https://img.xkw.com/dksih/QBM/2016/7/28/1572945071775744/1572945077805056/STEM/a05c8d6e3f3e4c8f9fcb46950e8c827e.png?resizew=215)
您最近一年使用:0次
2016-12-04更新
|
824次组卷
|
3卷引用:吉林省辽源市田家炳高级中学2019届高三上学期期末考试数学(文)试题
8 . 如图,已知四边形
是正方形,
平面
,
,
,
,
,
分别为
,
,
的中点.
![](https://img.xkw.com/dksih/QBM/2018/4/12/1922378615128064/1923439395725312/STEM/ae4a02bf729a417db1881b6a0384c256.png?resizew=150)
(Ⅰ)求证:
平面
;
(Ⅱ)求证:平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e1d18c0a9b93ea4fd4543c5785d0b4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91a226848c51c38a94270b487771752a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/2018/4/12/1922378615128064/1923439395725312/STEM/ae4a02bf729a417db1881b6a0384c256.png?resizew=150)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96b8c2721ada247b03f41f328539b301.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bafca98775a8046c0b4173e240a571b5.png)
(Ⅱ)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec25944411308ab64ecbdd32509d945.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
您最近一年使用:0次
9 . 如图:在三棱锥
中,已知点
、
、
分别为棱
、
、
的中点
![](https://img.xkw.com/dksih/QBM/2011/12/30/1570670039982080/1570670045437952/STEM/2299ab14-3d43-4899-b304-e1d6184909ff.png?resizew=205)
⑴ 求证:
∥平面 ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
⑵ 若
,
,求证:平面
⊥平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.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/8a6e2867f32d3f1c3cd36cd3a11a8580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2bc5e50b8dfa02601c70822252854a.png)
![](https://img.xkw.com/dksih/QBM/2011/12/30/1570670039982080/1570670045437952/STEM/2299ab14-3d43-4899-b304-e1d6184909ff.png?resizew=205)
⑴ 求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
⑵ 若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15e9dd4214806c4d29cfab79a4a7698e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b6e4a2df58a236c20df5df0d29a466c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5000fea066102e62cf2128ccbbd2b3e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次
2016-12-01更新
|
988次组卷
|
9卷引用:2011-2012学年吉林省长春二中高一下学期第二次月考理科数学试卷
(已下线)2011-2012学年吉林省长春二中高一下学期第二次月考理科数学试卷(已下线)黑龙江省鹤岗一中2010-2011学年高一下学期期末考试数学(文)(已下线)2011---2012学年四川省成都铁中高二10月考数学试卷(已下线)2011-2012学年山东省济宁市泗水一中高一3月月考数学试卷(已下线)2012—2013学年四川省攀枝花市七中高二上学期期中理科数学试卷北京市西城159中学2016-2017学年高二上学期期中考试数学试题【全国百强校】黑龙江省鸡西虎林市东方红林业局中学2017-2018学年高一下学期末考试数学试卷北师大版 全能练习 必修2 第一章 6.1 垂直关系判定(已下线)2.1.3 空间中直线与平面之位置关系-2020-2021学年高一数学课时同步练(人教A版必修2)
10 . 如图,ABCD是正方形,O是正方形的中心,PO⊥底面ABCD,E是PC的中点.
![](https://img.xkw.com/dksih/QBM/2019/1/4/2111579613659136/2113483006533632/STEM/f60c28398fb84d4ca8a2bca51a9b8f14.png?resizew=160)
求证:(Ⅰ)PA∥平面BDE;
(Ⅱ)平面PAC⊥平面BDE;(III)若PB与底面所成的角为600,AB=2a,求三棱锥E-BCD的体积.
![](https://img.xkw.com/dksih/QBM/2019/1/4/2111579613659136/2113483006533632/STEM/f60c28398fb84d4ca8a2bca51a9b8f14.png?resizew=160)
求证:(Ⅰ)PA∥平面BDE;
(Ⅱ)平面PAC⊥平面BDE;(III)若PB与底面所成的角为600,AB=2a,求三棱锥E-BCD的体积.
您最近一年使用:0次
2017-07-24更新
|
663次组卷
|
2卷引用:【全国百强校】吉林省通化市第十四中学2018-2019学年高二上学期期末考试数学(文)试题