题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073947-90820.gif)
棱的长=__________________;
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073947-38963.gif)
解析
核心考点
举一反三
在四边形ABCD中,
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073938-55594.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073938-37677.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073938-13436.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073939-24241.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073939-16630.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073939-40978.jpg)
(1)求折后
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073939-74374.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073939-66063.gif)
(2)求折后点
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073940-36056.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073940-22512.gif)
如图,三棱柱
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073928-82824.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073928-64948.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073929-87348.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073929-67581.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073929-61103.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073929-39116.gif)
(Ⅰ)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073930-15399.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073930-70452.gif)
(Ⅱ)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073930-27363.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073930-62348.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073930-85945.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073915-93525.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073916-84449.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073916-58441.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073915-93525.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073916-43934.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073916-55580.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073916-48021.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073917-31601.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073917-81030.jpg)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073917-78130.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073917-83451.gif)
(2)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073918-62959.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073917-83451.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073911-40820.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073911-20374.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073912-79418.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073912-87355.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073911-40820.png)
点个数为( )
A.0个 | B.1个 | C.最多1个 | D.最多2个 |
三棱
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073857-78146.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073857-36902.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073857-87763.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073857-34977.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073857-88999.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073858-17849.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073858-90997.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073858-30495.gif)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073858-33308.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073859-67261.gif)
(2)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073859-70118.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073859-61148.gif)
(3)求二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073859-49893.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022073859-60331.jpg)
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