题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130644-36986.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130644-91860.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130645-59090.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130645-74113.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130645-55673.jpg)
⑴证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130645-55853.png)
⑵求三棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130646-17108.png)
答案
解析
试题分析:(1)线线垂直转化为线面垂直的思想.(2)应用分割法求面积较简单,通过(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130646-63222.png)
试题解析:⑴由
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130646-77197.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130646-68182.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130647-85982.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130647-15357.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130647-87523.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130645-55853.png)
(2)由(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130646-63222.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130647-33696.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130648-75121.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130648-16890.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130648-78534.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130648-60756.png)
核心考点
举一反三
A.3:2 | B.3:1 | C.2:3 | D.4:3 |
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130637-29360.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130626-43234.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130626-46595.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130627-99211.jpg)
(1)求证:EM∥平面ABC;
(2)试问在棱DC上是否存在点N,使NM⊥平面
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130627-86479.png)
点N的位置;若不存在,请说明理由.
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130617-55284.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130617-35879.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130617-42082.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130617-40590.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130617-57501.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130617-45701.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130617-67738.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130617-14258.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130618-88141.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130618-15569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130618-42148.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130618-34767.png)
(Ⅰ)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130618-95139.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130618-15569.png)
(Ⅱ)求三棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130618-74116.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130607-65919.png)
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