1 . 图1是矩形
,
,
,M为
的中点,将
沿
翻折,得到四棱锥
,如图2.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/8bb90e9e-faf7-45a2-b234-c9dbf97df248.png?resizew=331)
(Ⅰ)若点N为
的中点,求证:
平面
;
(Ⅱ)若
.求点A到平面
的距离.
![](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/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/101da161ae17652ccbe7d3f888762c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a21158c6a4bb5d42e75fef98bf72ca27.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/8bb90e9e-faf7-45a2-b234-c9dbf97df248.png?resizew=331)
(Ⅰ)若点N为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d447ce2833cac5260ed5532283fa3997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9df915a088300b53c298fecd10675e5b.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/804c0e2a375b5f4ff1c420532968efc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
您最近一年使用:0次
2020-05-15更新
|
1098次组卷
|
4卷引用:2020届安徽省示范高中皖北协作区高三下学期第22届联考文科数学试题
解题方法
2 . 如图所示是某几何体的三视图,则该几何体的外接球的表面积为( )
![](https://img.xkw.com/dksih/QBM/2020/5/12/2461213390422016/2462702330396672/STEM/d47a2198d3e44f9a9d7b7c78a51cebe2.png?resizew=163)
![](https://img.xkw.com/dksih/QBM/2020/5/12/2461213390422016/2462702330396672/STEM/d47a2198d3e44f9a9d7b7c78a51cebe2.png?resizew=163)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2020-05-14更新
|
252次组卷
|
2卷引用:2020届湖南省娄底市高三高考仿真模拟文科数学试题
名校
解题方法
3 . 如图,在四面体
中,E是线段
的中点,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/ec273443-bdba-42ed-9eaa-b88fa4d3ea5d.png?resizew=162)
(1)证明:
;
(2)求平面
与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bb80bf2994f71e7c74972725fd98573.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f5fc4ad65b723b6a8da4c8dac154e6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21519ccb36fd595bb21e6189d305ef1e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/ec273443-bdba-42ed-9eaa-b88fa4d3ea5d.png?resizew=162)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e7f2ab75abc366639a5ca25f6f3d951.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9a814b70236a108be5d6e7ff271fe92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/678b28fddb166d90878d24d6e5481080.png)
您最近一年使用:0次
2020-05-09更新
|
979次组卷
|
5卷引用:2020届安徽省安庆市高三第二次模拟理科数学试题
2020届安徽省安庆市高三第二次模拟理科数学试题四川省成都外国语学校2019-2020学年高二下学期期中考试数学(理)试题(已下线)选择性必修第一册模块检测卷(基础过关)-2020-2021学年高二数学单元测试定心卷(人教A版2019选择性必修第一册)(已下线)第3章 空间向量与立体几何(提高卷)-2020-2021学年高二数学课时同步练(苏教版选修2-1)四川省成都市玉林中学2020-2021学年高二下学期期中数学试题
名校
解题方法
4 . 如图,在三棱柱
中,
,
为
中点,平面
平面
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/94a628d3-455c-403b-a665-5fde902547a2.png?resizew=158)
(1)求证:
平面
;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a9ad711b25c36dae0c2a2cedff9954.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77e4bef1e4e2b748afa3caa59f926201.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/94a628d3-455c-403b-a665-5fde902547a2.png?resizew=158)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07391ef575d28f09bc5cda0ff8130a54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5888bec948373f3854258ad80171073d.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fa8345302e8036af33d4598282144d7.png)
您最近一年使用:0次
2020-05-09更新
|
1383次组卷
|
2卷引用:安徽省阜阳市太和第一中学2020-2021学年高二(平行班)上学期开学考试数学试题
名校
5 . 已知直线
的方程为
,直线
在
轴上的截距为
,且
.
求直线
与
的交点坐标;
若直线
经过
与
的交点,且在两坐标轴上的截距相等,求
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12e35701dd16dbf6ec916064880b8b52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ce08b357f11ef44c3e8207ac574422a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
您最近一年使用:0次
2020-05-09更新
|
951次组卷
|
6卷引用:安徽省皖东县中联盟2019-2020学年高一下学期5月联考数学试题
安徽省皖东县中联盟2019-2020学年高一下学期5月联考数学试题安徽省合肥市第五中学2020-2021学年高二上学期期中理科数学试题河南省九师商周联盟2019-2020学年高一12月联考数学试题辽宁省大连市第二十三中学2022-2023学年高二上学期第一次月考考试数学试题(已下线)辽宁省大连市第二十三中学2022-2023学年高一上学期期中数学试题(已下线)第二章 直线与圆的方程(易错必刷40题18种题型专项训练)-【满分全攻略】2023-2024学年高二数学同步讲义全优学案(人教A版2019选择性必修第一册)
6 . 如图四棱柱
中,
,
,
,M为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/8be08be5-ebae-49f1-8fe8-364c81f6ec7d.png?resizew=204)
(1)证明:
平面
;
(2)若四边形
是菱形,且面
面
,
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f28ca4930b132289a485903ad9f1b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/8be08be5-ebae-49f1-8fe8-364c81f6ec7d.png?resizew=204)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5865d488a9cf1181016fd2e866177cdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
(2)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce04b35c265cc9c48b60204bd2f718ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef6eb4cbf412b69b098716b26151fba3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fa2fb03002a3c4e58c4bf3c81a22c7a.png)
您最近一年使用:0次
解题方法
7 . 如图是第七届国际数学教育大会的会徽,它的主题图案由一连串如图所示的直角三角形演化而成.设其中的第一个直角
是等腰三角形,且
,则,
,现将
沿
翻折成
,则当四面体
体积最大时,它的表面有________ 个直角三角形;当
时,四面体
外接球的体积为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15536798ab47cadce6d4d80f542051f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee25f9d4364568a1409bc84fdc5a6017.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb42a63da706592280193d4102a9bd1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15536798ab47cadce6d4d80f542051f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c76916c6ff302cf4fb4b6ace5bb3a95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7fac9edcf08eabbd352169552860eb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/776e703f82e0077ee54a84641bdbeb4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aa5a7e9c3b85b83051cb278500368a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/776e703f82e0077ee54a84641bdbeb4c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/067c59a1-9f5a-4822-a5fa-02939ba2be25.png?resizew=359)
您最近一年使用:0次
名校
解题方法
8 . 在矩形
中,
,
为
边上一点,将点
以
为轴旋转至点
的位置,且点
在面
内的投影恰为
的中点
,则此时三棱锥
外接球的表面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ba14258640ad7c7d34026a920fb3d53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://img.xkw.com/dksih/QBM/2020/4/22/2446937767387136/2447460142841856/STEM/5b10a84bb67a490ea066574c3ca2c9d0.png?resizew=276)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2020-05-07更新
|
673次组卷
|
2卷引用:安徽省六安市舒城中学2019-2020学年高二下学期第三次月考数学(文)试题
解题方法
9 . 已知四棱锥
的底面是菱形,且
,
,
,O为AB的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/e6bd4a7e-c116-46a2-abde-5b0ca18519a1.png?resizew=227)
(1)求证:
平面
;
(2)求点B到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c753cb1eb73fd8d136d00462970797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fdcf9088d7250c4a72adc77a8c5fe46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98d5838ce03dda91e1bfd0def5355a62.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/e6bd4a7e-c116-46a2-abde-5b0ca18519a1.png?resizew=227)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec5e0a296b2a9fd6c73320e29611be5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求点B到平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
您最近一年使用:0次
解题方法
10 . 《九章算术》是我国古代内容极为丰富的数学名著,系统地总结了战国、秦、汉时期的数学成就,书中将底面为长方形且有一条侧棱与底面垂直的四棱锥称之为“阳马”,若某“阳马”的三视图如图所示(网格纸上小正方形的边长为1),则该“阳马”外接球表面积为________
![](https://img.xkw.com/dksih/QBM/2020/4/29/2451833662283776/2453180223709184/STEM/c653280bb78f4244a1466e474cbf25e8.png?resizew=199)
您最近一年使用:0次