题目
题型:不详难度:来源:
![](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.
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130627-34873.png)
解析
试题分析:(1)要证明直线和平面平行,只需证明直线和平面内的一条直线平行即可,该题取
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130627-43547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130627-53183.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130627-28333.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130627-10059.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130628-11607.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130628-63804.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130628-67339.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130628-82287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130628-13611.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130628-44300.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130628-44833.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130628-52702.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130628-75945.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130628-32762.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130629-82469.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130629-20510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130629-63567.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130629-55080.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130629-67048.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130629-53176.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130629-84092.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130630-64303.png)
试题解析: (Ⅰ)取
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130627-43547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130627-53183.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130627-28333.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130630-60278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130630-17328.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130628-82287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130630-19350.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130628-82287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130628-67339.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130628-82287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130630-42702.jpg)
(2)在
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130628-13611.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130630-64303.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130627-34873.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130628-52702.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130630-50563.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130630-55945.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130631-41913.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130628-82287.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130631-37042.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130631-80819.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130628-75945.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130628-32762.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130629-82469.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130629-20510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130629-63567.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130631-75460.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130628-44833.png)
核心考点
试题【如图是一个直三棱柱被削去一部分后的几何体的直观图与三视图中的侧视图、俯视图.在直观图中,是的中点.又已知侧视图是直角梯形,俯视图是等腰直角三角形,有关数据如图所】;主要考察你对柱锥台的表面积等知识点的理解。[详细]
举一反三
![](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)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130601-52284.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130601-63675.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130602-41551.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130602-88445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130601-63675.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130602-19514.png)
(Ⅰ)如果
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130602-47325.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130602-21754.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130603-91330.png)
(Ⅱ)如果正方形
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130601-63675.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130603-81201.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130549-40171.png)
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