1 . 在四棱锥
中,侧面
底面ABCD,底面ABCD为直角梯形,
,
,
,
,E,F分别为AD,PC的中点.
![](https://img.xkw.com/dksih/QBM/2019/2/17/2142824740323328/2144979324903424/STEM/b3e8f545ccda4f2eb0d15c55b0ac5ab9.png?resizew=187)
Ⅰ
求证:
平面BEF;
Ⅱ
若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d02bd5cfe804460846423e77f72db10f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebbb79892c8cb8871a08437acc09bc80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c58bafdd3bb54ba3491b49ab60b172f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb655dcddebb50942249461aa852fba9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96897a3650133b139bb8216967008f3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b90fe3657d4dbe1ac0839572866037e.png)
![](https://img.xkw.com/dksih/QBM/2019/2/17/2142824740323328/2144979324903424/STEM/b3e8f545ccda4f2eb0d15c55b0ac5ab9.png?resizew=187)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1666b45ed176d648dd1764f4a2dbd73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56982f8cf241b04a9885681626bd4f95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ca211f5091244d59a9380111f2e5ca3.png)
您最近一年使用:0次
2018-08-24更新
|
1369次组卷
|
6卷引用:广西南宁市第三中学2020届高三数学(理科)考试卷一试题
解题方法
2 . 如图,在四棱柱
中,
平面
,
,
,
,
为棱
上一动点,过直线
的平面分别与棱
,
交于点
,
,则下列结论正确的是__________ .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/13/212a9987-53d1-4408-b01b-07e4200b2afc.png?resizew=176)
①对于任意的点
,都有![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38480c0817e9cb1fd1653e93f231abbd.png)
②对于任意的点
,四边形
不可能为平行四边形
③存在点
,使得
为等腰直角三角形
④存在点
,使得直线
平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4340375ca8abdbd6998760c944f38d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f487191e72e8d7600ad2051828678cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/13/212a9987-53d1-4408-b01b-07e4200b2afc.png?resizew=176)
①对于任意的点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38480c0817e9cb1fd1653e93f231abbd.png)
②对于任意的点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e0d75422e2e1ae0ed77f764cb47d375.png)
③存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46d72cf9ade99d60cdfef83f1c91da6f.png)
④存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/963a91995abd4927d75406d16e10a81f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e0d75422e2e1ae0ed77f764cb47d375.png)
您最近一年使用:0次
名校
3 . 已知四棱锥
,底面
为正方形,且
底面
,过
的平面与侧面
的交线为
,且满足
(
表示
的面积).
(1)证明:
平面
;
(2)当
时,二面角
的余弦值为
,求
的值.
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28ee2d2c33f73571cb9e3b96276f1acc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49a131604d5c482ec8edb88e00687277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f1c4ed7451103f0cbf14bb9ae219b43.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/18/24779f04-4ddc-4719-bb0f-da3ea8aab7bd.png?resizew=155)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa69a2247ad4d5231aa361349b12f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc4ba0f5fb4a61b67ce8f9984e6f7f49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/206695fadf6ab817ae8650f47fbf65d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f687ee88f27e8fe32de9d2435b3241f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
2018-02-09更新
|
1016次组卷
|
5卷引用:广西桂林、崇左、防城港市2020届高三联合模拟考试数学(理)试题
广西桂林、崇左、防城港市2020届高三联合模拟考试数学(理)试题河北省石家庄市2018届高三毕业班教学质量检测数学(理)试题河北省衡水中学2018届高三数学理科三轮复习系列七-出神入化7(已下线)专题19 立体几何综合-2020年高考数学(理)母题题源解密(全国Ⅲ专版)广东省珠海市大湾区2023-2024学年高二上学期1月期末联合考试数学试题
4 . 在如图所示的几何体中,四边形
为平行四边形,
,
平面
,
,
,
,
,
,且
是
的中点.
(1)求证:
平面
;
(2)求二面角
的余弦值的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02b6d19fedaf8488f9637cd64efbca83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/477dc280b77f5640565dbc0ddf24460a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/058f36d315245b63a811d5c6f348c17b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de927f7e512ea6302e38ef1b453e58c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4901a7eda97d6a307db76c4fb196ba3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc4f3da376bd01ef33579e6eecc6f047.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd0285afe567ca0b32f0ccafc30167cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa3254460ecbacecb3e57c5dce227f4.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fab6a076ed5e7a28751ac94d8a54e48.png)
![](https://img.xkw.com/dksih/QBM/2018/1/25/1867936849747968/1868937950134272/STEM/4702faf9-a418-4fdf-a732-b495da9ff8b7.png?resizew=292)
您最近一年使用:0次
2018-01-26更新
|
1238次组卷
|
9卷引用:广西陆川县中学2018届高三下学期第二次质量检测 数学(理)试题
5 . 如图,在四棱锥
中,底面
为梯形,平面
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5528310855c85b21a7b627208f551b2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d52623aef17583cfb3bbbe0f84e1979c.png)
为侧棱
的中点,且
.
![](https://img.xkw.com/dksih/QBM/2018/1/18/1863306702086144/1863855812747264/STEM/b69ce3e57a9540858606a674feae6f12.png?resizew=134)
(1)证明:
平面
;
(2)若点
到平面
的距离为
,且
,求点A到平面
的距离.
![](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/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5528310855c85b21a7b627208f551b2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d52623aef17583cfb3bbbe0f84e1979c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827d63fc436eac20adaf279d57b0ea1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e839ac941e8bf536ff35a12e56c7a400.png)
![](https://img.xkw.com/dksih/QBM/2018/1/18/1863306702086144/1863855812747264/STEM/b69ce3e57a9540858606a674feae6f12.png?resizew=134)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/932a04304f2d4975955d4baabb2deeea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b929269c53a44907dba8ee298a0a522.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
您最近一年使用:0次
2018-01-19更新
|
545次组卷
|
3卷引用:广西梧州市2021届高三3月联考数学(文)试题
6 . 如图,在四棱锥P﹣ABCD中,底面ABCD是菱形,PD⊥平面ABCD,PD=AD=3,PM=2MD,AN=2NB,∠DAB=60°.
(1)求证:直线AM∥平面PNC;
(2)求二面角D﹣PC﹣N的余弦值.
(1)求证:直线AM∥平面PNC;
(2)求二面角D﹣PC﹣N的余弦值.
![](https://img.xkw.com/dksih/QBM/2017/11/13/1823301979258880/1858885472600064/STEM/4c2be99b3fc0421991423c8c9d30fde0.png?resizew=139)
您最近一年使用:0次
2018-01-12更新
|
613次组卷
|
3卷引用:南宁市2018届高三毕业班摸底联考数学(理)试题
解题方法
7 . 如图,在直三棱柱
中,
,
,
,
分别是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/ee48d601-34ab-4e9d-bde6-23f5aa0c63a9.png?resizew=156)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
平面
;
(2)求点
到平面
的距离.
![](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/dbfaf94af8e01d6d6a5c4273ed8076c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/025df2a9934b457cf20d91604e430612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2743e10dd8bce468d1d397b3e9a550d3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/ee48d601-34ab-4e9d-bde6-23f5aa0c63a9.png?resizew=156)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2730b513bd3359c3dfe6567e04f5ef9.png)
您最近一年使用:0次
2018-01-05更新
|
701次组卷
|
3卷引用:广西桂梧高中2018届高三上学期第五次联考数学(文)试题
8 . 如图,在直三棱柱
中,
,
,
,
分别是
的中点.
![](https://img.xkw.com/dksih/QBM/2018/1/4/1853191453376512/1853891497795584/STEM/4bfa727bf5ee41c687ae95c8367b3e72.png?resizew=145)
(1)求证:
平面
;
(2)求平面
与平面
所成的锐二面角的余弦值.
![](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/dbfaf94af8e01d6d6a5c4273ed8076c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/025df2a9934b457cf20d91604e430612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2743e10dd8bce468d1d397b3e9a550d3.png)
![](https://img.xkw.com/dksih/QBM/2018/1/4/1853191453376512/1853891497795584/STEM/4bfa727bf5ee41c687ae95c8367b3e72.png?resizew=145)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/588690c4a218025937357ffab8d63c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6a51a168f6a3c308fcfcede6406aa3.png)
您最近一年使用:0次
2018-01-02更新
|
548次组卷
|
3卷引用:广西壮族自治区贺州市桂梧高中2018届高三上学期第五次联考数学(理)试卷
名校
解题方法
9 . 如图,在四棱锥
中,
底面
,底面
为菱形,
,
,过
作平面
与直线
平行,交
于点
.
(1)求证:
为
的中点;
(2)求三棱锥
的体积.
![](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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f83a04565a8ebaa111894b724b0ba266.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ea806939ab65af688284de59a21488c.png)
![](https://img.xkw.com/dksih/QBM/2018/3/11/1899890522177536/1901930678460416/STEM/564b3820fcaf4e978a83540fbe3bd71e.png?resizew=163)
您最近一年使用:0次
2017-12-22更新
|
847次组卷
|
3卷引用:广西贵港市2018届高三上学期12月联考数学(文)试题
10 . 如图,三棱柱
中,
平面
,
分别为
和
的中点,
是边长为2 的正三角形,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/4/cda4dd39-0a6c-49de-8ca1-53ef57fca7c1.png?resizew=209)
(1)证明:
平面
;
(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/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77f8be504cdda71d9127e5d6869ac31e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/682cd9755e458cbe08f4b3fbe118f398.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/4/cda4dd39-0a6c-49de-8ca1-53ef57fca7c1.png?resizew=209)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0b39562ebcbac4476e41725a66bb4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f77f400a3cf0acb19d4e4c7da2b80a7.png)
您最近一年使用:0次
2017-12-11更新
|
420次组卷
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2卷引用:广西玉林市、柳州市2017届高三4月联考数学(理)试题