题目
题型:不详难度:来源:
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070557-37498.jpg)
答案
解析
![]() |
设等腰三角形直角边长为
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070557-18557.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070557-70670.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070557-50765.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070558-89829.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070558-72325.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070558-93633.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070558-45273.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070558-14614.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070559-51577.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070559-71810.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070559-22329.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070559-52389.png)
核心考点
试题【如图,以等腰直角三角形ABC的斜边BC上的高AD为折痕,将ΔABD和ΔACD折起,使折起后的ΔABC成等边三角形,则二面角C-AB-D的余弦值等于 】;主要考察你对线线角等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070552-94060.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070552-16476.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070552-54356.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070552-46550.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070553-70631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070552-94060.png)
____________.
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070547-33952.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070547-54891.png)
如果
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070547-81521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070547-44602.png)
(1)求C、D两点间的距离.
(2)求点D到平面ABC的距离
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070547-46403.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070533-48344.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070533-78714.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070533-32766.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070534-20432.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070534-70801.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070534-17768.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070534-77934.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070535-39212.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070535-34979.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070535-75879.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070535-59248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070536-82862.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070536-73446.png)
(2)求直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070536-35432.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070536-67575.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070537-36578.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070527-25145.png)
点D在
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070527-37061.png)
(1)证明:无论
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070527-85106.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070528-38937.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070527-85106.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070528-57127.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070528-72706.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070520-64055.png)
A.若![]() ![]() | B.若![]() ![]() |
C.若![]() ![]() | D.若![]() ![]() |
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