名校
解题方法
1 . 《九章算术商功》中提及的“鳖臑”现意为四个面均为直角三角形的三棱锥,则“鳖臑”中相互垂直的平面有( )对
A.4 | B.3 | C.2 | D.1 |
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解题方法
2 . 《九章算术》是我国古代的数学经典名著,它在几何学方面的研究比西方早一千年,在《九章算术》中,将四个面都为直角三角形的四面体称为“鳖臑”.如图,“鳖臑”几何体
中,
平面
,
,
于点
,
于点
.设
,
,
,则有( )
![](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/0cad7b03f934718b18ce34cdf0b85863.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b60a982d3ec7a4a4d17638f8daf3cc30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ee42d7d94bc89c0ee62c61b475b6eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f01d6e6120371778c2bee61b926349.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/174e05bb37bc5a3d12b6c510ad46cee9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/507a7ec8b828ed2a18b26ed8cf74a5e5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/17/e06219a7-f399-4e01-9403-e5e3951cea07.png?resizew=129)
A.四面体![]() ![]() |
B.平面![]() ![]() |
C.![]() ![]() ![]() |
D.![]() |
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解题方法
3 . 我国古代数学名著《九章算术》第五卷“商功”中,把底面为矩形且有一条侧棱与底面垂直的四棱锥称为“阳马”.今有“阳马”
,
平面ABCD,
,
分别为棱
,
的中点.以下四个结论:
①
平面
;
②
平面
;
③平面
平面
:
④平面
平面
.
其中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e51ff5984de07692a7dd4ac1381082.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/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45fbffb9e2c7fa7c5006cde8da0cabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a5f445af1ae136773cb338920552ff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
③平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f04c222223dae9ef27d4c132534d9848.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
④平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6501f1c913a4ef64957a2f01ab5baa15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
其中正确的是( )
A.①③ | B.①④ | C.②③ | D.②④ |
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