12-13高三上·河北保定·期末
名校
解题方法
1 . 如图,在正三棱柱
中,
是
的中点,
是线段
上的动点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/5ba9f6a1-cd82-417e-9c4e-c99b879a70dc.png?resizew=123)
(1)若
,求证:
;
(2)求二面角
的余弦值;
(3)若直线
与平面
所成角的大小为
,求
的最大值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ede6a60cad0e0b58e1549fda6e085719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/958217185cddb12466c9760248a4ca01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b094e639c2b31dc54b1b3e6456e77843.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc65c549059934e69355d8ecc245da57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7895c919da3819abea641a35524afcdf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/5ba9f6a1-cd82-417e-9c4e-c99b879a70dc.png?resizew=123)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8da022b26812ea653c7ed00cb1fb448.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c17067fa0e18231e358545529dbee69.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3f566da2725ef9999fccac9e27fb4ea.png)
(3)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68ecff583dd5f216b28e0df718943ebc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4891e5861897266806a8c113be5e8ab9.png)
您最近一年使用:0次
名校
2 . 在四棱锥
中,平面
平面
,底面
为矩形,
,
,
,
、
分别为线段
、
上一点,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/bf50abb3-4d68-451c-a41d-14c579f5d2ad.png?resizew=187)
(1)证明:
;
(2)证明:
平面
,并求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4117625867a74cd022584500c76deca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e05d8681a679bd31922e62480f69d55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/251387023641ec1af5b58801666ecda2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bac9bf01e282af11adc5b45044a499b.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/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348fb71fbc47fd87e9ce011652ef4186.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3505caf94539d51c4edba53a78ad0d3b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/bf50abb3-4d68-451c-a41d-14c579f5d2ad.png?resizew=187)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52ab924e3692515bd8be4c36472a959a.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f16835e3f230ba3f543b6804e445e283.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf2f0df53aa68c9c334165034788166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2990ef24039c6be7643cb582062503a.png)
您最近一年使用:0次
2019-03-28更新
|
1363次组卷
|
7卷引用:【市级联考】贵州省黔东南州2019届高三下学期第一次模拟考试数学(文)试题
3 . 已知
是不同的三条直线,
是平面,则下列命题中为真命题的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ead7f004a93707d658819c75a89dfa0.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
4 . 如图
,已知
是边长为6的等边三角形,点D、E分别是边AB、AC上的点,且满足
,如图
,将
沿DE折成四棱锥
,且有平面
平面BCED.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/d00ede0a-ef3d-4867-abb6-5c333154ac24.png?resizew=295)
求证:
平面BCED;
记
的中点为M,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7cbfaa25e4214d4ba60263ffbbdeb19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefe4a3e7a7fa195ed6a6712447639b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf003bae8825213ee584aee873e7e366.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b24f8448d58a398aa449ef0443c5fc73.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/d00ede0a-ef3d-4867-abb6-5c333154ac24.png?resizew=295)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e8778aee92f0f2bf7c676e56625f00d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8f157dfa84c959ddb9324ed303a70d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b01490c6f741c82680d608e4d689d908.png)
您最近一年使用:0次
5 . 如图,在四棱锥
中,底面ABCD是矩形,
,E,F分别为BC,CD的中点,且
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/437d19406753ee07f403ef7a4094d605.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/e3ead519-07f3-45da-8d7d-7371f658be91.png?resizew=201)
求证:
平面PBD;
平面PEF.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d02bd5cfe804460846423e77f72db10f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ed4f2b8f2f8fced0fd7f6784117247d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/104175a41a6bbd4531822cd53d69cce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/437d19406753ee07f403ef7a4094d605.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/e3ead519-07f3-45da-8d7d-7371f658be91.png?resizew=201)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77b5fe221a99803ddb64b87bf35cda47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b601f45feea9f13175129e66072a1237.png)
您最近一年使用:0次
名校
6 . 如图,四棱锥
的底面为正方形,
底面
,则下列结论中不正确的是
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/8e07666a-6800-4def-960d-4cb990d7498f.png?resizew=170)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fb2e071d4e01107dcf7d95cbb86b415.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/8e07666a-6800-4def-960d-4cb990d7498f.png?resizew=170)
A.![]() |
B.![]() ![]() |
C.平面![]() ![]() |
D.![]() ![]() ![]() ![]() |
您最近一年使用:0次
2019-02-28更新
|
1007次组卷
|
4卷引用:【全国百强校】陕西省西安中学2018-2019学年高一上学期期末考试数学试题
名校
解题方法
7 . 如图,在四棱锥
中,
,
,
,
,
分别是
和
的中点,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/517972d2-397c-4d5f-927b-d9decdc43676.png?resizew=172)
(1)证明:
;
(2)证明:平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/502a46021ff0bd64fc4cd3bad7d8a826.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64f1161e0345b3646c71365430dccbb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/517972d2-397c-4d5f-927b-d9decdc43676.png?resizew=172)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c583493109d50c9e4634c05e9042a9f.png)
(2)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d103e9cd501065d24ab94b5fd6cb37.png)
您最近一年使用:0次
2019-02-05更新
|
1287次组卷
|
6卷引用:【校级联考】广西贺州市非示范性高中2018-2019学年高一上学期期末考试数学试题
8 . 已知正方体
,
分别为
和
上的点,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/94f5b982-b9c7-4f35-a4d4-99b5d56a79f3.png?resizew=169)
(1)求证:
;
(2)求证:
三条直线交于一点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de4a54cc7818be87a239f6de5f5d05b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661df691bacf67f20557fef29c1af1eb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/94f5b982-b9c7-4f35-a4d4-99b5d56a79f3.png?resizew=169)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18651187aefe66083be1358eeffa2e55.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55cf07b3d7d4c1c241181ff66a00097e.png)
您最近一年使用:0次
9 . 在四棱锥
中,
平面
,
,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/32cda40b-59c4-4001-9866-b2d1c6897211.png?resizew=147)
(1)求证:
.
(2)当
时,求此四棱锥的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f1897a7e856b42f8cee0f286ad913d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9ee7ec207528fdd7f22287dafc2dcd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e2a44d05b1d387150c4b359e021ffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ffc2817fa590affb5a760a25dc65308.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/32cda40b-59c4-4001-9866-b2d1c6897211.png?resizew=147)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bbd7c2767c106faf27d6a97ebc8e739.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cd5c4f8b106d01e0e431078e1a468b.png)
您最近一年使用:0次
10 . 如图所示,在四棱锥
中,底面
为菱形,
底面
,点
是
上的一个动点,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/7168efdb-d22c-4434-8d9d-3b04c69b7fef.png?resizew=184)
(1)当
时,求证:
;
(2)当
平面
时,求二面角
的余弦值.
![](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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829f9180ddd9aa1a0ee0dc520f4e0b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd7a42341edbc0b01ab0769c4c02c3e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/7168efdb-d22c-4434-8d9d-3b04c69b7fef.png?resizew=184)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f586ec271c8ba58611b4bb160ae1017.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/789c9c79846abc6ba99cf3e575cdae6f.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/083b08552886374380117e5146525855.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9af29254fe60a392c249c5791279e9c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a87ad143b4be9e23cf51b63c76b45c1.png)
您最近一年使用:0次