题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013135-85748.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013135-97942.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013135-97940.gif)
答案
解析
核心考点
试题【在正四棱锥S-ABCD中,E是BC的中点,P点在侧面内及其边界上运动,并且总是保持PEAC.则动点P的轨迹与△SCD组成的相关图形最有可能的是( ). 】;主要考察你对空间几何体的结构特征等知识点的理解。[详细]
举一反三
已知正方形ABCD的边长为1,
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013127-95535.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013127-91736.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013127-56707.gif)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013127-27914.gif)
(2)求二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013127-48992.gif)
![]() | |||||
![]() | |||||
![]() | |||||
如图,已知四棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013105-16582.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013106-61887.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013106-86571.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013106-61887.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013106-92179.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013106-88655.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013106-15204.gif)
(Ⅰ)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013106-82196.gif)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013106-19266.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013106-85612.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013107-49692.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013107-59885.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013107-15007.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013107-12438.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013107-63425.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-80676.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-81392.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-45870.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-36967.gif)
①若
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-81392.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-45870.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-81392.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-45870.gif)
②若
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-81392.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-45870.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-81392.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-45870.gif)
③若
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-80676.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-96933.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-45870.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-81392.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-96933.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-36967.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-81392.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-80676.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-45870.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-36967.gif)
④若
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-81392.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-96933.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-36967.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013050-70036.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013050-56773.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-45870.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-36967.gif)
⑤若
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-80676.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-96933.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-45870.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-81392.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-96933.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-36967.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-45870.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-36967.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-80676.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013049-81392.gif)
其中正确命题的序号是 .(把你认为正确命题的序号都填上)
如图所示,在三棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013040-65984.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013040-55504.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013040-76316.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013040-24267.jpg)
(1)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013041-40959.gif)
(2)求侧面
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013041-85808.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013041-37286.gif)
如图,
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013033-70582.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013033-38043.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013033-38404.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013033-86333.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013034-49306.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013034-53737.jpg)
(1)求证:DM//面ABC;
(2)平面
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013034-43962.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013034-96074.gif)
(3)求直线AD与面AEC所成角的正弦值;
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