1 . 如图,在四棱锥PABCD中,PA⊥平面ABCD,底面ABCD是直角梯形,AB⊥AD,CD⊥AD. 求证:平面PDC⊥平面PAD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/1/25f8a2b7-3b58-417d-9ab1-34b951c2b6db.png?resizew=207)
您最近一年使用:0次
名校
2 . 给定下列四个命题,其中真命题是( )
A.垂直于同一直线的两条直线相互平行 |
B.若一个平面内的两条直线与另一个平面都平行,那么这两个平面相互平行 |
C.垂直于同一平面的两个平面相互平行 |
D.若两个平面垂直,那么一个平面内与它们的交线不垂直的直线与另一个平面也不垂直 |
您最近一年使用:0次
2020-05-20更新
|
515次组卷
|
6卷引用:2020届山西省晋中市高三下学期一模(普通招生考试模拟)数学(理)试题
解题方法
3 . 在矩形ABCD中,AB=1,AD=2,△ABD沿对角线BD翻折,形成三棱锥A﹣BCD.
①当
时,三棱锥A﹣BCD的体积为
;
②当面ABD⊥面BCD时,AB⊥CD;
③三棱锥A﹣BCD外接球的表面积为定值.
以上命题正确的是_____ .
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b810c5efd7b649ece8bd13f5da48f561.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb84f6fbac102ccf326b2223d69cb7cc.png)
②当面ABD⊥面BCD时,AB⊥CD;
③三棱锥A﹣BCD外接球的表面积为定值.
以上命题正确的是
您最近一年使用:0次
解题方法
4 . 在△ABC中,∠C=90°,AB=2,
,D为AC上的一点(不含端点),将△BCD沿直线BD折起,使点C在平面ABD上的射影O在线段AB上,则线段OB的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b810c5efd7b649ece8bd13f5da48f561.png)
A.(![]() | B.(![]() ![]() | C.(![]() | D.(0,![]() |
您最近一年使用:0次
2020-05-19更新
|
339次组卷
|
2卷引用:2020届四川省绵阳市高三第三次诊断性测试数学(理)试题
5 . 如图,矩形
中,
,
,
为
的中点,点
,
分别在线段
,
上运动(其中
不与
,
重合,
不与
,
重合),且
,沿
将
折起,得到三棱锥
,则三棱锥
体积的最大值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.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/d685b2138e6499686474bb2d131a2234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/999c42a021bdc576f097246b9e64d986.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1374ab4727cdf890e1fb79ce75ae2f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1374ab4727cdf890e1fb79ce75ae2f6.png)
![](https://img.xkw.com/dksih/QBM/2020/5/14/2462787111813120/2464037455339520/STEM/5feebe67cbb742909fdbb014615a5641.png?resizew=204)
您最近一年使用:0次
名校
解题方法
6 . 如图,矩形
中,
,
,
为
的中点,点
,
分别在线段
,
上运动(其中
不与
,
重合,
不与
,
重合),且
,沿
将
折起,得到三棱锥
,则三棱锥
体积的最大值为______ ;当三棱锥
体积最大时,其外接球的半径![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3ef4881bd7c5860178dbdbc7bba6e3.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.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/d685b2138e6499686474bb2d131a2234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/999c42a021bdc576f097246b9e64d986.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1374ab4727cdf890e1fb79ce75ae2f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1374ab4727cdf890e1fb79ce75ae2f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1374ab4727cdf890e1fb79ce75ae2f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3ef4881bd7c5860178dbdbc7bba6e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/58236a04-2bc6-48ac-8e67-1e4f7be7898c.png?resizew=196)
您最近一年使用:0次
7 . 如下图①,在直角梯形
中,
,
,
,点
在线段
上运动.如下图②,沿
将
折至
,使得平面
平面
,则
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe005f6989456d84528c72265fe0404e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13b1e717e9fc4481050672eec8ac5c0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2657e02314469ad2b13d31dce41b4343.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a534c0b15fde45f309ca30950e687f00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af4db79ed8c305bed8a99642a0405446.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d70676406f26d339465fe3473c0c05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c92b5799d12ea37de46d7c942ce7a9.png)
![](https://img.xkw.com/dksih/QBM/2020/5/12/2461213236322304/2462753879638016/STEM/c6c27e802df24904ad85d874100fe414.png?resizew=474)
您最近一年使用:0次
名校
解题方法
8 . 四棱锥
,
面PAB,
面PAB,底面ABCD为梯形,
,
,
,
,满足上述条件的四棱锥顶点P的轨迹是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/c5975f5a-c49c-40bd-bd79-d7a03840eb0b.png?resizew=192)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd9c4807350e42413a2d54b63e18b728.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/c5975f5a-c49c-40bd-bd79-d7a03840eb0b.png?resizew=192)
A.线段 | B.圆的一部分 |
C.椭圆的一部分 | D.抛物线的一部分 |
您最近一年使用:0次
2020-05-09更新
|
553次组卷
|
3卷引用:2020届广东省江门市高三下学期4月模拟数学(理)试题
2020届广东省江门市高三下学期4月模拟数学(理)试题(已下线)第41练 曲线与方程-2021年高考数学(理)一轮复习小题必刷黑龙江省齐齐哈尔市实验中学2020-2021学年高三上学期期末数学(理科)试题
2020高三·全国·专题练习
解题方法
9 . 如图A,B,C,D为空间四点,在△ABC中,AB=2,AC=BC=
,等边三角形ADB以AB为轴旋转,当平面ADB⊥平面ABC时,CD=( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/22d501e2-06a1-4556-acfe-1b4ada293893.png?resizew=114)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e051d14fd6a787387995331f5e6d026.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/22d501e2-06a1-4556-acfe-1b4ada293893.png?resizew=114)
A.![]() | B.2 |
C.![]() | D.1 |
您最近一年使用:0次
名校
10 . 下列命题错误的是( )
A.若平面![]() ![]() ![]() ![]() |
B.若平面![]() ![]() ![]() ![]() |
C.若平面![]() ![]() ![]() ![]() |
D.若平面![]() ![]() ![]() ![]() ![]() ![]() |
您最近一年使用:0次
2020-09-02更新
|
474次组卷
|
9卷引用:百师联盟2019届全国高三模拟考试(三)全国卷文科数学试题
百师联盟2019届全国高三模拟考试(三)全国卷文科数学试题(已下线)第34讲 空间中的垂直关系-2021年新高考数学一轮专题复习(新高考专版)(已下线)第26练 垂直关系-2021年高考数学一轮复习小题必刷(山东专用)黑龙江省哈尔滨师范大学附属中学2020-2021学年高三上学期期中考试数学(理)试题黑龙江省哈师大附中2021届高三(上)期中数学(理科)试题(已下线)第31练 直线、平面垂直的判定与性质-2021年高考数学(文)一轮复习小题必刷(已下线)8.6.3 平面与平面垂直(练习)-2020-2021学年下学期高一数学同步精品课堂(新教材人教版必修第二册)四川省广元市2020-2021学年高二下学期期末数学(理科)试题四川省广元市2020-2021学年高二下学期期末数学(文科)试题