1 . 二面角
为
,
、
是棱上的两点,
、
分别在半平面
、
内,
,
且
,
,则
的长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f5f0d07ad7876b56fc5c07337dfd6ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d539cc46b0195b1d9963a7305bcd94.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3d1a34ae2b8c77f8d7e355c6d1d667e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74c62c14a017007a6bdfe25eada9c433.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32dcae3d9cf0ba76d1d42f06b746285.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bddd22b0a1ed05c4705c6d44db1134d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/883fc5e3faf39829d60804b59deb1730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714cc3707bba3bfdb56e251999be8592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
A.1 | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2016-12-03更新
|
339次组卷
|
2卷引用:2015-2016学年四川省成都七中实验学校高二上学期期中理科数学试卷
9-10高二下·四川绵阳·期中
名校
解题方法
2 . 如图,
是四面体,
是
的重心,
是
上一点,且
,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/2/91eebfbe-b400-43c0-a38f-3c7550739780.png?resizew=144)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011ae6cb0cf49f6d3d19b485dc1cfc22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307bd991211ec79b47a4be52933bb8e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19acf31b506e43131011ede077b5a2fa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/2/91eebfbe-b400-43c0-a38f-3c7550739780.png?resizew=144)
A.![]() |
B.![]() |
C.![]() |
D.![]() |
您最近一年使用:0次