1 . 在直四棱柱
中,底面
是菱形,
,
,
、
分别是线段
、
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/b5ba0577-4c01-47bb-a6b9-10b7fa346500.png?resizew=178)
(1)求证:
;
(2)求平面
与平面
所成锐二面角的余弦值.
![](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/e6906f59d09ce31956d6f5ea2b23fc77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37ee9a532fa778770cc599d8592a9cfd.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/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/b5ba0577-4c01-47bb-a6b9-10b7fa346500.png?resizew=178)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/509d8dd6031dc0ef92075877e53fe201.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6261790c66cc71ee3898afabad0c09f4.png)
您最近一年使用:0次
2020-01-03更新
|
548次组卷
|
2卷引用:河南省天一大联考2019-2020学年高三阶段性测试(三)数学(理)试题
2 . 图①中△ABC 为直角三角形
D、E 分别为 AB、AC 的中点,将△ADE 沿 DE 折起使平面 ADE⊥BCED,连接 AB,AC,BE如图②所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/f045eb23-dfa9-48c2-a20e-3bf035d71882.png?resizew=330)
(1)在线段AC上找一点P,使EP∥平面ABD,并求出异面直线AB、EP所成的角;
(2)在平面ABD内找一点Q,使PQ⊥平面ABE,并求三棱锥P-ABE的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee3cde08d18a91454fbd33633e79959.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/f045eb23-dfa9-48c2-a20e-3bf035d71882.png?resizew=330)
(1)在线段AC上找一点P,使EP∥平面ABD,并求出异面直线AB、EP所成的角;
(2)在平面ABD内找一点Q,使PQ⊥平面ABE,并求三棱锥P-ABE的体积.
您最近一年使用:0次
名校
解题方法
3 . 如图,正方体
的棱长为
,P在正方形ABCD的边界及其内部运动,平面区域W由所有满足
的点P组成,则W的面积是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35361e76a7c85d1886728c8d0200b234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f7c354eacc4f5869f81604d1fc863b2.png)
![](https://img.xkw.com/dksih/QBM/2020/3/21/2424227852492800/2424312382423040/STEM/7a962f3d-21c5-4180-b6b5-fd1431796729.png)
您最近一年使用:0次
2020-03-21更新
|
116次组卷
|
2卷引用:湖北省鄂州市华容高级中学2019-2020学年高三上学期8月质量检测数学(文)试题
名校
解题方法
4 . 三棱锥
的高
,若
,二面角
为
,
为
的重心,则
的长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a12c5ba0d51bd636610cd812716cc9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9a95931ace2908da2312a6be7e79413.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39addc1173a458af87ed5c5e3f06466.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
5 . 如图,在三棱锥P﹣ABC中,PA⊥AB,PA=1,PC=3,BC=2,sin∠PCA
,E,F,G分别为线段的PC,PB,AB中点,且BE
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/492dc959-0255-417a-be03-e4e589afdb5a.png?resizew=153)
(1)求证:AB⊥BC;
(2)若M为线段BC上一点,求三棱锥M﹣EFG的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34efd0021d06e31448496f3673eb2a45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb6da35cb03b489e795ee5f6b612a11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/492dc959-0255-417a-be03-e4e589afdb5a.png?resizew=153)
(1)求证:AB⊥BC;
(2)若M为线段BC上一点,求三棱锥M﹣EFG的体积.
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解题方法
6 . 如图:正三棱柱
中
,
,点P在平面
中,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7201faa561aef62a788812483fa1eb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/60f77cf3-ff13-45e3-8338-685b0b57633e.png?resizew=125)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1bb20ec923649b64b3a1a40b61c0360.png)
(2)求三棱锥
的体积
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/462b1c65b1b233ab98a90c164c0968c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7201faa561aef62a788812483fa1eb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/60f77cf3-ff13-45e3-8338-685b0b57633e.png?resizew=125)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1bb20ec923649b64b3a1a40b61c0360.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9130b5a7a17763c5f51413cf912a66a4.png)
您最近一年使用:0次
7 . 如图所示,在四边形
中,
,
,
.将四边形
沿对角线
折成四面体
,使平面
平面
,则下列结论中正确的结论个数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/0ceae6b6-f6b1-4138-a992-bca96069709f.png?resizew=237)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/408f7d9f-5fc9-44d1-b4cb-9050bc89ccd7.png?resizew=233)
①
;②
;
③
与平面
所成的角为
;
④四面体
的体积为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/832afec35b94e7f73af80164b2b81c9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d6bdfb0e1be5583e794ab614a8abe1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff9c7cbcc38b28d45c8539710e5b260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeb4c6e9a723aa843e6ba62d7c1a3a6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fe052786101dfcc941480919eb2cecc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/0ceae6b6-f6b1-4138-a992-bca96069709f.png?resizew=237)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/408f7d9f-5fc9-44d1-b4cb-9050bc89ccd7.png?resizew=233)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b219a74a1ce5a2b22c36d8de1e21ff91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910fab9c432cda7e4642535638046094.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a037b1a3ec2e37bbcb05d0a467efb511.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fd148d264bc9043396f777523e907aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac09dc1ca2cdd7aef28c218763d3e4d.png)
④四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeb4c6e9a723aa843e6ba62d7c1a3a6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2020-03-05更新
|
607次组卷
|
6卷引用:湖北省孝感市2018-2019学年高一下学期期末数学试题
湖北省孝感市2018-2019学年高一下学期期末数学试题湖北省襄阳市2018-2019学年高一下学期期末数学试题湖北省随州市2018-2019学年高一下学期期末数学试题(已下线)【新东方】新东方高二数学试卷302(已下线)狂刷39 立体几何的综合-学易试题君之小题狂刷2020年高考数学(理)(已下线)【新东方】杭州新东方高中数学试卷332
8 . 在四棱锥
中,底面是边长为4的菱形,
,
,
平面
.
![](https://img.xkw.com/dksih/QBM/2020/5/2/2453956499644416/2454971807817728/STEM/87b02f12604e48dd887eb8b42a5bd9dc.png?resizew=230)
(1)证明:
;
(2)若
是
的中点,
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a23f01af749100e1888bba06268843db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e126c16032892966489053f44b9048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2020/5/2/2453956499644416/2454971807817728/STEM/87b02f12604e48dd887eb8b42a5bd9dc.png?resizew=230)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b07e317ffe7859e81b42ef4970e344a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf8c8abea8b8ac8d2891c4ccb53fd1c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b98d08cb05a894f940009f56c74d83c.png)
您最近一年使用:0次
2020-05-03更新
|
174次组卷
|
2卷引用:湖北省孝感市五校协作体2018-2019学年高三上学期期中理科数学试题
名校
9 . 如图所示,三棱柱
中,侧面
为菱形,
在侧面
上的投影恰为
的中点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/1649b8b1-c543-4a22-98ab-9e2cf5cd918d.png?resizew=222)
(1) 证明:
;
(2) 若
,且三棱柱
的体积为
,求三棱柱
的高.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28628f8495115d6f85bd0243a33434d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/1649b8b1-c543-4a22-98ab-9e2cf5cd918d.png?resizew=222)
(1) 证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8db87b41df9d3c83d2810a4265d768d3.png)
(2) 若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c7fd49bb962841b4575805030e19add.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42ec13ca7115ccd73a9d793758f1c170.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
您最近一年使用:0次
2019-09-07更新
|
1425次组卷
|
4卷引用:湖北省鄂南高中2019-2020学年高三上学期10月月考数学(文)试题
湖北省鄂南高中2019-2020学年高三上学期10月月考数学(文)试题2020届湖北省武汉市新洲区高三10月联考试题文科数学安徽省合肥一中、安庆一中等六校教育研究会2020届高三上学期第一次素质测试数学(文)试题(已下线)2020届高三12月第01期(考点07)(文科)-《新题速递·数学》
名校
10 . 如图,三棱柱
,点
在平面
内的射影
在AC上,
且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/0abb30af-1867-48f3-8fbb-37327c4abd95.png?resizew=214)
(1)求证:
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fde022e5980c241890f821f161ed5829.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90e17995e2f71e297d94ae51c7e5b1f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/0abb30af-1867-48f3-8fbb-37327c4abd95.png?resizew=214)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3c1e54f0318d3fab1742308cad4bc8.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/966b2d5659b3dc130fe0e4b2c0ff0072.png)
您最近一年使用:0次
2019-12-09更新
|
183次组卷
|
2卷引用:湖北省部分重点高中2019-2020学年高三11月期中联考数学理科试题