1 . 正方体
的棱长为1,
、
分别在线段
与
上,
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/2021/5/20/2725366523854848/2763160729034752/STEM/eb9bef98-3e9a-43d6-b432-2699d370f647.png?resizew=226)
您最近一年使用:0次
2 . 图1是由正方形
组成的一个等腰梯形,其中
,将
、
分别沿
折起使得E与F重合,如图2.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/96241205-5ee2-45fe-a504-beb19971deba.png?resizew=315)
(1)设平面
平面
,证明:
;
(2)若二面角
的余弦值为
,求
长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69f0391c01548b0b5968f5b72cdd203a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df7626240940eb340420a605e95aeee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c4cd264c97c1f261229925cc5a6761.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/96241205-5ee2-45fe-a504-beb19971deba.png?resizew=315)
(1)设平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca0832e094d5c05ec13c38ae556b3f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c0566d4ccf791d639c7823398941d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56adc934c9ad3cb261c5cbdc346b9631.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/445b51117626fbd3373e32acc514c64b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee14db57f0c762aad845cf5b4a243c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
您最近一年使用:0次
2021-04-16更新
|
1067次组卷
|
7卷引用:江苏省徐州市第七中学2022-2023学年高三上学期10月学情调研数学试题
名校
解题方法
3 . 已知图1中,
、
、
、
是正方形
各边的中点,分别沿着
、
、
、
把
、
、
、
向上折起,使得每个三角形所在的平面都与平面
垂直,再顺次连接
,得到一个如图2所示的多面体,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/0cc3e25f-ad25-463c-a758-40951b83088a.png?resizew=350)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bc1b68f13fed987f5209197de7bc8b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c768dedaea22607617398ce28a02dd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63b43490ca09467a4c8cd8cfe91c94e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/0cc3e25f-ad25-463c-a758-40951b83088a.png?resizew=350)
A.![]() |
B.平面![]() ![]() |
C.直线![]() ![]() ![]() |
D.当![]() ![]() ![]() |
您最近一年使用:0次
2021-01-30更新
|
1857次组卷
|
10卷引用:湖北省2020-2021学年高二下学期3月联考数学试题
湖北省2020-2021学年高二下学期3月联考数学试题福建省泉州市高中数学2020-2021学年度高二上学期教学质量监测数学试题(已下线)专题06 空间向量与立体几何(难点)-2020-2021学年高二数学下学期期末专项复习(北师大版2019选择性必修第一册、第二册)(已下线)卷03 空间向量与立体几何-单元检测(难)-2021-2022学年高二数学单元卷模拟(易中难)(2019人教A版选择性必修第一册+第二册)苏教版(2019) 选修第二册 名师精选 高考水平模拟性测试卷福建省晋江市第一中学2021-2022学年高二上学期期中考试数学试题江苏省南京师范大学附属中学2021-2022学年高二下学期期中数学试题(已下线)第23节 空间几何体的表面积与体积(已下线)期中测试卷(能力篇)(范围:第一章+第二章椭圆)-2022-2023学年高二数学上学期同步知识梳理+考点精讲精练(人教B版2019选择性必修第一册)(已下线)高二上学期期中【压轴60题考点专练】(选修一全部内容)-2022-2023学年高二数学考试满分全攻略(人教A版2019选修第一册)
20-21高二·全国·假期作业
名校
解题方法
4 . 如图,边长为
的正方形
中,点
、
分别是
、
的中点,将
、
、
分别沿
、
、
折起,使得
、
、
三点重合于点
,若四面体
的四个顶点在同一个球面上,则该球的表面积为( ).
![](https://img.xkw.com/dksih/QBM/2021/1/2/2627625581830144/2627957209669632/STEM/e4555bb5929043f7a13d8c5d19dbd434.png?resizew=265)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9966839944bf4087bd18fede1d2d2c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e9b8a991d00fdd2810dda7adc54fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fdb0f5d98c262afe3783b1ac24735f.png)
![](https://img.xkw.com/dksih/QBM/2021/1/2/2627625581830144/2627957209669632/STEM/e4555bb5929043f7a13d8c5d19dbd434.png?resizew=265)
A.![]() |
B.![]() |
C.![]() |
D.![]() |
您最近一年使用:0次
2021-01-03更新
|
1734次组卷
|
10卷引用:宁夏银川一中2021届高三第六次月考数学(理)试题
宁夏银川一中2021届高三第六次月考数学(理)试题(已下线)专题18+选修2-1综合练习-2020-2021学年【补习教材·寒假作业】高二数学(理)(人教A版)(已下线)专题08+选择性必修第一册综合练习-2020-2021学年【补习教材·寒假作业】高二数学(人教A版2019)江西省赣县第三中学2020-2021学年高二上学期期末复习理科数学试题四川省绵阳市南山中学2020-2021学年高三下学期开学考试数学(理)试题新疆维吾尔自治区2021届高三诊断性自测(第一次)数学(文)试题(已下线)专题8.2 立体几何初步 章末检测2(中)-【满分计划】2021-2022学年高一数学阶段性复习测试卷(人教A版2019必修第二册)四川省绵阳南山中学2020-2021学年高三下学期开学考试理科数学试题(已下线)专题18 选修2-1综合练习黑龙江省七台河市勃利县高级中学2022-2023学年高一下学期期末数学试题
5 . 已知正方体
的棱长为5,其中有一半径为2的球
与该正方体的底面
和两个侧面
,
都相切,另有一球
,既与正方体的另外两侧面
,
以及底面
相切,又与球
相切,则球
的半径为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b54387f870ae37f7951b253665d64f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
您最近一年使用:0次
2020-12-02更新
|
313次组卷
|
3卷引用:百师联盟2021届高三一轮复习联考(三)全国卷I理科数学试题
百师联盟2021届高三一轮复习联考(三)全国卷I理科数学试题山东省济南市章丘区第一中学2020-2021学年高三上学期一轮复习联考(三)数学试题(已下线)热点08 立体几何-2021年高考数学(理)【热点·重点·难点】专练
6 . 已知
、
,试在
轴上求一点
,使
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e4b021c1c2186acb377972a99eacea1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea56f5c85b045f8efe9a602aa96a77ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f30acc34f4ee1077532ae6808af2ab2.png)
您最近一年使用:0次
名校
解题方法
7 . 已知矩形
,
,
,沿对角线
将
折起,使得
,则二面角
的大小是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4630b9ca3d20635161fa8fbf812b9128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2176dac04a8b410e319342fb8e895b1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a439406eca299c91f6b0a3ed66dd3370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c909cd1b6f3fa1ec39eb245e8f5c11c.png)
您最近一年使用:0次
2020-11-15更新
|
412次组卷
|
3卷引用:天津市第五十五中学2020-2021学年高二(上)第一次月考数学试题
名校
8 . 在空间直角坐标系
中,点
是
平面内的直线
上的一点,若点
到点
的距离最小,则点
的坐标为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5e336d6ca2cae3d6e6c3810d7e521a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45900deae0489e87fe448948e8091c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348a258e62cb25b6050c793e3f554c62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
您最近一年使用:0次
9 . 已知空间中两点
,
,在
轴上有一点
到
、
两点距离相等,则
点坐标为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c996183b555dda79d40380c155ef002c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3b78792675c3004320cc16b969bf40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5615812990deef255366042987977c58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
您最近一年使用:0次
10 . 已知
,则
满足( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caa81f0f71086599fe9f0d92fd9aa891.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
A.三点共线 | B.构成直角三角形 |
C.构成钝角三角形 | D.构成等边三角形 |
您最近一年使用:0次
2020-10-23更新
|
285次组卷
|
3卷引用:北京教师进修学校2020-2021学年高二十月数学月考试题