2021高三·全国·专题练习
解题方法
1 . 一种特殊的四面体叫做“鳖臑”,它的四个面均为直角三角形.如图,在四面体P
ABC中,设E,F分别是PB,PC上的点,连接AE,AF,EF(此外不再增加任何连线),则图中直角三角形最多有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/bff61f8d-6c86-427e-81a7-33b6fe162c54.png?resizew=134)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bfc339cf6dd66599db64fa3fa44e608.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/bff61f8d-6c86-427e-81a7-33b6fe162c54.png?resizew=134)
A.6个 | B.8个 |
C.10个 | D.12个 |
您最近一年使用:0次
2 . 如图(1),平面四边形
中,
,
,
,将
沿
边折起如图(2),使________,点
,
分别为
,
中点.在题目横线上选择下述其中一个条件,然后解答此题.①
.②
为四面体
外接球的直径.③平面
平面
.
![](https://img.xkw.com/dksih/QBM/2021/4/26/2708173069008896/2710350918230016/STEM/1fe61260-ca66-4348-a818-c0c4e41ee4b1.png?resizew=447)
(1)判断直线
与平面
的位置关系,并说明理由;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/520f8abda6a85e7ef6f281fc2df853fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b81939c1f23fa5fb48a3a270bbf52d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7650cede07c4758a9b3bb1da4553acc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/520f8abda6a85e7ef6f281fc2df853fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://img.xkw.com/dksih/QBM/2021/4/26/2708173069008896/2710350918230016/STEM/1fe61260-ca66-4348-a818-c0c4e41ee4b1.png?resizew=447)
(1)判断直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e82346a63d015b21ee11cbcd025c682.png)
您最近一年使用:0次
2021-04-29更新
|
968次组卷
|
6卷引用:四川省泸州市泸县第二中学2022届高三上学期第四学月考试数学(文)试题
四川省泸州市泸县第二中学2022届高三上学期第四学月考试数学(文)试题慕华优策联考2021届高三第三次联考文科数学试卷(已下线)押新高考第19题 立体几何-备战2021年高考数学临考题号押题(新高考专用)江苏省淮安市六校联盟2020-2021学年高一下学期第七次学情调查数学试题四川省射洪中学校2022-2023学年高二上学期1月月考数学(文)试题(已下线)押新高考第19题 立体几何-备战2022年高考数学临考题号押题(新高考专用)