名校
1 . 《九章算术》是我国古代数学名著,它在几何学中的研究比西方早1000多年,在《九章算术》中,将底面为直角三角形且侧棱垂直于底面的三棱柱称为堑堵,将底面为矩形且一侧棱垂直于底面的四棱锥称为阳马,将四个面均为直角三角形的四面体称为鳖臑.如图在堑堵
中,
,
,
,
分别为棱
,
的中点,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30dbd22b0cbb47c914c42a4355e3ca98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
A.四面体![]() |
B.![]() ![]() |
C.若![]() ![]() ![]() ![]() |
D.三棱锥![]() ![]() |
您最近一年使用:0次
2023-05-20更新
|
420次组卷
|
2卷引用:宁夏银川市第二中学2022-2023学年高一下学期期中考试数学试题
名校
解题方法
2 . 如图,在正方体
中,E,F,G分别是棱
,
,
的中点,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/3e98cc68-ae5d-4d34-9a11-bffde4d11390.png?resizew=193)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/3e98cc68-ae5d-4d34-9a11-bffde4d11390.png?resizew=193)
A.![]() ![]() | B.![]() ![]() |
C.点![]() ![]() | D.点F在平面![]() |
您最近一年使用:0次
2022-07-06更新
|
1414次组卷
|
9卷引用:宁夏银川市第六中学2022-2023学年高一下学期期中考试数学试题