解题方法
1 . 《九章算术》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,将四个面都为直角三角形的四面体称之为鳖臑.在如下图所示的阳马P-ABCD中,侧棱
底面ABCD,且
,则当点E在下列四个位置:PA中点、PB中点、PC中点、PD中点时分别形成的四面体E-BCD中,鳖臑有
![](https://img.xkw.com/dksih/QBM/2020/3/11/2417270334832640/2418053776637952/STEM/2c87f5eb-b9ce-4712-9470-dcb89c6e5885.png?resizew=238)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c772949a7425943d058f513629c9a983.png)
![](https://img.xkw.com/dksih/QBM/2020/3/11/2417270334832640/2418053776637952/STEM/2c87f5eb-b9ce-4712-9470-dcb89c6e5885.png?resizew=238)
A.1个 | B.2个 | C.3个 | D.4个 |
您最近一年使用:0次
2020-03-12更新
|
99次组卷
|
2卷引用:江西省萍乡市2015-2016学年高二上学期期末文科数学试题
名校
2 . 《九章算术》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,将四个面都为直角三角形的四面体称之为鳖臑.下图所示的阳马
中,侧棱
底面ABCD,且
,则当点E在下列四个位置:PA中点、PB中点、PC中点、PD中点时分别形成的四面体
中,鳖臑有( )个.
![](https://img.xkw.com/dksih/QBM/2020/2/24/2405989020647424/2407946390011904/STEM/b3630d9fb1134f1e810a1d3e2a2a413a.png?resizew=138)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c772949a7425943d058f513629c9a983.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42020cfacd62b300cad053981bab9e0b.png)
![](https://img.xkw.com/dksih/QBM/2020/2/24/2405989020647424/2407946390011904/STEM/b3630d9fb1134f1e810a1d3e2a2a413a.png?resizew=138)
A.0 | B.1 | C.2 | D.3 |
您最近一年使用:0次
2020-02-27更新
|
288次组卷
|
2卷引用:安徽省合肥市一六八中学2019-2020学年高二上学期期末数学(文)试题
名校
解题方法
3 . 在《九章算术》中,将四个面都为直角三角形的四面体称之为鳖臑.如图,在鳖臑
中,
平面
,
,且
,过点
分别作
于点
,
于点
,连结
,当
的面积最大时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cc216d456790748fda154e2c73d0c4b.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9fd9540710e56838940d36d8a4802e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfbaf73297240eb116f22489519895a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f392902d611863c6908a48e696e7bd8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f201a40fedca4ad14db193f4db2127e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cc216d456790748fda154e2c73d0c4b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/7315f9b0-25cd-45ce-a57c-47b82c6f1b21.png?resizew=140)
您最近一年使用:0次
2020-02-09更新
|
423次组卷
|
4卷引用:浙江省杭州市西湖区杭州学军中学2019-2020学年高二上学期期末数学试题
浙江省杭州市西湖区杭州学军中学2019-2020学年高二上学期期末数学试题(已下线)【新东方】新东方高二数学试卷291重庆市育才中学2020届高三下学期3月月考数学(理)试题(已下线)【新东方】高中数学20210304-002
名校
4 . 在我国古代数学名著《九章算术》中,将四个面都是直角三角形的四面体称之为鳖臑,在鳖臑
中,
平面
,且有
,
,
,点
是
上的一个动点,则
的面积的最小值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff9c7cbcc38b28d45c8539710e5b260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a05e0ab55e325fb3b85fc8ca9c27c76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49e2a5a8708c06d509c766863a4d6279.png)
您最近一年使用:0次
2019-11-13更新
|
362次组卷
|
4卷引用:上海市市北高级中学2018-2019学年高二下学期期中数学试题