题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085022-40567.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085022-63323.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085022-68963.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085022-43220.gif)
(1) 求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085022-17368.gif)
(2) 设
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085023-36634.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085023-25472.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085023-24511.gif)
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085023-25472.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085023-84214.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085023-95012.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085024-97023.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085024-83817.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085024-92418.gif)
又平面
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085024-66567.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085022-68963.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085025-46893.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085022-68963.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085025-61962.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085025-15992.gif)
可知
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085023-25472.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085025-37939.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085026-89378.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085022-17368.gif)
![]() | |||
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(2)解:如图(2),作
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085026-85601.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085026-46848.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085027-97998.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085027-45279.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085027-17242.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085027-52467.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085027-81799.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085028-30785.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085028-14264.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085026-89378.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085028-60922.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085023-24511.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085028-74266.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085026-89378.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085023-25472.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085023-24511.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085028-74266.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085026-89378.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085029-44831.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085023-25472.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085023-24511.gif)
在
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085029-24246.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085023-36634.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085029-43229.gif)
在
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085029-78051.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085029-31614.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085030-69864.gif)
在
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085030-93524.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085030-46126.gif)
在
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085030-54079.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085031-88537.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085031-43150.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085031-37896.gif)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085023-25472.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085023-24511.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085031-80955.gif)
![]() |
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085009-82313.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085009-93679.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085009-14924.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085010-80758.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085010-23401.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085010-79729.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085010-25052.gif)
![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085003-51146.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085003-92550.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085003-75561.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085004-28284.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085004-77300.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085004-44530.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085004-89502.gif)
求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085004-77300.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085004-44530.gif)
![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084952-55056.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084952-73449.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084952-49642.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084952-10509.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084952-98940.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084953-45704.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084952-55056.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084952-73449.gif)
求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084953-78319.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084943-74944.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084944-94248.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084944-15998.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084944-87314.gif)
为棱
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084944-61137.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084944-65584.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084944-73213.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084944-56500.gif)
(2)求证:平面
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084945-51052.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084944-56500.gif)
(3)如果
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084945-53814.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084944-15998.gif)
表面上依次经过棱
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084945-76228.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084945-71908.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084945-12612.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084945-25626.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084945-16845.gif)
最终又回到点
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084944-15998.gif)
如图,在直四棱柱ABCD-A
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084937-47500.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084937-47500.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084937-47500.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084937-47500.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084937-47500.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084937-47500.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084937-47500.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084937-47131.jpg)
(1)设F是棱AB的中点,证明:直线EE
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084937-47500.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084937-47500.gif)
(2)证明:平面D1AC⊥平面BB1C1C。
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