解题方法
1 . 在四面体
中,
,
,
,设四面体
与四面体
的体积分别为
、
,则
的值为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a351136b18bc7d3bd5122332772ab23b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a8c3adfb5c3cb6dd9ba688856e2dd0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90592be71b12efb676770f65d68596f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d1bb96d6663c8cdbf43ba53e1505e1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a351136b18bc7d3bd5122332772ab23b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f107bd06ad6af2ff8d5aaa9ace12d9a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4764374bd2fb78e59cd0b283637baeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63055a5d6916f99d07fede49120753f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae00abada46919dffcfb342971dcdabd.png)
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解题方法
2 . 对于一个三维空间,如果一个平面与一个球只有一个交点,则称这个平面是这个球的切平面.已知在空间直角坐标系
中,球
的半径为
,记平面
、平面
、平面
分别为
、
、
.
(1)若棱长为
的正方体、棱长为
的正四面体的内切球均为球
,求
的值;
(2)若球
在
处有一切平面为
,求
与
的交线方程,并写出它的一个法向量;
(3)如果在球面上任意一点作切平面
,记
与
、
、
的交线分别为
、
、
,求
到
、
、
距离乘积的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5e336d6ca2cae3d6e6c3810d7e521a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddd48d1ef9e8cd3b7aea60fd95b70fb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ef1e8a88d934eca5399decc64fdbd43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f435efcc7869eec21bdba1ed81dc3f5.png)
(1)若棱长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2122e3f1e76a635e58e4d54aa594c552.png)
(2)若球
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f5dcb10e84c60bbb67a382349ebeb3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67202feb9b75fb893e9fc70cc1059d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67202feb9b75fb893e9fc70cc1059d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(3)如果在球面上任意一点作切平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f435efcc7869eec21bdba1ed81dc3f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
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名校
3 . 已知正方体
是一个棱长为2的正方体容器,
,
分别为
,
的中点,下列选项中正确的是( )
命题甲:过
,
,
三点的截面面积为
.
命题乙:若
,
,
为三个小孔(孔的大小忽略不计),则此时容器的最大装水量为6
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.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)
命题甲:过
![](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/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0874f019492261eb175bdcc08c189d.png)
命题乙:若
![](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/b1241216f3c1cb5e73043dd1037f556d.png)
A.命题甲和命题乙都为真命题 |
B.命题甲和命题乙都为假命题 |
C.命题甲为真命题,命题乙为假命题 |
D.命题甲为假命题,命题乙为真命题 |
您最近一年使用:0次
4 . 豆腐发酵后表面长出一层白绒绒的长毛就成了毛豆腐,将三角形豆腐ABC悬空挂在发酵空间内,记发酵后毛豆腐所构成的几何体为T.若忽略三角形豆腐
的厚度,设
,点
在
内部.假设对于任意点
,满足
的点
都在
内,且对于
内任意一点
,都存在点
,满足
,则
的体积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd01f8d99637871de828cb6b87ec7b33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f13626c6a20a7b6f04afadaa0c7827bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f13626c6a20a7b6f04afadaa0c7827bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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5 . 已知
是边长为1的等边三角形.对于空间中任意一点M,设P为
内部(含边界)一动点,定义PM的最小值为点M到
的距离.则空间中到
的距离不大于1的点形成的几何体的体积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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名校
解题方法
6 . 如图1,已知
,
,
,
,
,
.
绕
轴旋转半周(等同于四边形
绕
轴旋转一周)所围成的几何体的体积;
(2)将平面
绕
旋转到平面
,使得平面
平面
,求异面直线
与
所成的角;
(3)某“
”可以近似看成,将图1中的线段
、
改成同一圆周上的一段圆弧,如图2,将其绕
轴旋转半周所得的几何体,试求所得几何体的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ee80939187a84e1863eeb192a301c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e87b3d349194312a934fced615e563c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3752eaf8b6f65d3faf930dc54bf2ef1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40540618c5b9bb0de570d4c742efe648.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65816deab5057903d4b9cb09d6190b21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f768ec9a3a36cab9c488149507fd199.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)将平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20af148464904e21f4374cc8fb886fba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ec6cf562ec0322dd2df37fbf56ef3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af048430d955eb2f6ba0f1cc4bc10243.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/678b28fddb166d90878d24d6e5481080.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d71fe246270d1277f9eb2bf15af22e83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(3)某“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/520bbc5e258f1b50b905af41f321ac15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
您最近一年使用:0次
2023-11-16更新
|
525次组卷
|
3卷引用:上海市进才中学2023-2024学年高二上学期期中数学试题
上海市进才中学2023-2024学年高二上学期期中数学试题重庆缙云教育联盟2024届高三高考第一次诊断性检测数学试卷(已下线)第二章 立体几何中的计算 专题三 空间体积的计算 微点4 四面体体积公式拓展综合训练【培优版】
解题方法
7 . 如图①,在棱长为1的正方体
中,E是棱
上的一个动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/3/27eb5ee9-401d-49e1-9d22-71c8990bbc40.png?resizew=320)
(1)求证:三棱锥
的体积是定值;
(2)是否存在点E,使得
平面
,若存在请找出点E的位置,若不存在,说明理由;
(3)定义:与两条异面直线都垂直且相交的直线称为这两条异面直线的公垂线,公垂线的两个垂足之间的线段称为异面直线的公垂线.两条异面直线的公垂线段,是连接两条异面直线所有线段中的最短线段.
根据以上定义及性质解决如下问题:
如图②中,M为线段
的中点,线段
(不包括两个端点)上有一个动点N,过点
、
、
作正方体的截面
.
①判断截面
的形状,并说明理由;
②当截面
的面积取得最小值时,求点N的位置.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/3/27eb5ee9-401d-49e1-9d22-71c8990bbc40.png?resizew=320)
(1)求证:三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8bcd4d16a1f2e89bb43fd1731a05ab1.png)
(2)是否存在点E,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/565133e91e3ace2b2187cfc6f1db5be6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a83c0b8db2205a6815811aa4ff5390f.png)
(3)定义:与两条异面直线都垂直且相交的直线称为这两条异面直线的公垂线,公垂线的两个垂足之间的线段称为异面直线的公垂线.两条异面直线的公垂线段,是连接两条异面直线所有线段中的最短线段.
根据以上定义及性质解决如下问题:
如图②中,M为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
①判断截面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
②当截面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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名校
解题方法
8 . 直观想象是数学六大核心素养之一,某位教师为了培养学生的直观想象能力,在课堂上提出了这样一个问题:现有10个直径为4的小球,全部放进棱长为a的正四面体盒子中,则a的最小值为( )
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2023-09-26更新
|
688次组卷
|
6卷引用:第11章 简单几何体(压轴必刷30题专项训练)-【满分全攻略】2023-2024学年高二数学同步讲义全优学案(沪教版2020必修第三册)
(已下线)第11章 简单几何体(压轴必刷30题专项训练)-【满分全攻略】2023-2024学年高二数学同步讲义全优学案(沪教版2020必修第三册)安徽省皖东名校联盟体2024届高三上学期9月第二次质量检测数学试题四川省成都市2023-2024学年高二上学期九月调研考试(校级联考)数学试题(已下线)考点16 立体几何中的最值问题 2024届高考数学考点总动员【讲】吉林省白山市抚松县第一中学2023-2024学年高一下学期5月期中考试数学试题吉林省长春外国语学校2023-2024学年高一下学期5月期中考试数学试题
名校
解题方法
9 . 在菱形
中,已知
,
.
是对角线
上一点,沿
把菱形折成二面角
,将折成二面角后的
点记作
,设
,点
在平面
上的射影记为
.
(1)当
是
的中点时,如图1,求证
平面
;
(2)当
落在菱形的边
上时,如图2,求二面角
的取值范围;
(3)设折痕
与菱形的边
交于点
,求四棱锥
体积的最大值(说明:可以用到必修一探究实践活动中得到的不等式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d936ea1443a8c881633d5e04fdd3434.png)
).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e918b70b02a73685e3c536c7f380e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8efa92fbb689ce6f9ab3384918f48774.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3160d33de228937b8a691519fced22e7.png)
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(1)当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf12905647aeeded72bbca21a63f319.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8efa92fbb689ce6f9ab3384918f48774.png)
(3)设折痕
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee724bdc07aa2bacb42d4779585a2a12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d936ea1443a8c881633d5e04fdd3434.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d3ac744d01bdb607d6c2ffd7ef64a24.png)
您最近一年使用:0次
名校
解题方法
10 . 空间内存在三点A、B、C,满足
,在空间内取不同两点(不计顺序),使得这两点与A、B、C可以组成正四棱锥,求方案数为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d94fd59bf678e8b0598cd701b3c79d3.png)
您最近一年使用:0次
2023-06-11更新
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1350次组卷
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5卷引用:2023年上海夏季高考数学练习
2023年上海夏季高考数学练习上海市南洋模范中学2023-2024学年高二上学期期中数学试题上海市晋元高级中学2023-2024学年高二下学期3月月考数学试卷(已下线)第01讲 计数原理(练习)(已下线)第一章 排列组合与二项式定理 专题一 两个计数原理 微点2 两个计数原理综合训练【基础版】