如图,棱长为1的正四面体
中,
为棱
的中点,则
的值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/8ad6174a-0fe2-4364-afbd-a8d7daa85d79.png?resizew=152)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0173d70c0593f0b2c451f42eb373f211.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/8ad6174a-0fe2-4364-afbd-a8d7daa85d79.png?resizew=152)
A.![]() | B.![]() | C.0 | D.![]() |
更新时间:2023-01-04 11:23:49
|
相似题推荐
单选题
|
适中
(0.65)
名校
解题方法
【推荐1】在△ABC中,A,B,C的对边分别为a,b,c.若
,当角A最大时,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2067f55acd9af97a4d59ae4641671ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7112e7ccb1eb90facfa5182ea763970a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
解题方法
【推荐2】已知双曲线的焦点为
,过点
的直线交双曲线左支于
两点,若
,
,则双曲线的离心率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76b2a1807916bfb580e1e0ebfc76c525.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/595204f5b59b488a4532af8f0555c77a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b2fb264193a043e69f042073f79dbc.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
名校
【推荐1】《九章算术》是我国东汉初年编订的一部数学经典著作,在第五卷《商功》中记载“斜解立方,得两堑堵”,堑堵是底面为直角三角形的直三棱柱.已知在堑堵
中,
,
,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/1bf7d3bc571d1f6a8b1c3fc74f14aaaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57dd5b7be65e7b3d3e768abc4ccbfb61.png)
A.![]() | B.1 | C.![]() | D.![]() |
您最近一年使用:0次