题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075429-18060.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075429-95046.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075429-12462.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075430-45196.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075430-35439.gif)
解析
核心考点
试题【如图所示,在直三棱柱ABC-A1B1C1中,底面为直角三角形,∠ACB=90°,AC=,BC=CC1=1,P是BC1上一动点,则的最小值是_____.】;主要考察你对线线角等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075419-21097.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075419-61477.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075419-61501.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075420-44137.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075420-98944.jpg)
如图,在四棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075403-42673.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075403-56825.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075403-84049.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075403-56825.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075403-72390.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075403-13184.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075403-91403.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075404-89206.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075404-88483.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075404-44416.jpg)
(Ⅰ)当
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075404-94844.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075404-69288.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075404-37948.gif)
(Ⅱ)当二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075404-30277.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075404-85966.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075404-21510.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075405-24164.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075347-41486.jpg)
如图,在四面体
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075347-25565.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075348-41537.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075348-77933.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075348-39229.gif)
(Ⅰ)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075348-19004.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075349-66532.gif)
(Ⅱ)求证:四边形
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075349-88486.gif)
(Ⅲ)是否存在点
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075349-22332.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075347-25565.gif)
如图,在直三棱柱ABC-A1B1C1中,∠BAC=90°,AB=AC=AA1=1,延长A1C1至点P,使C1P=A1C1,连接AP交棱CC1于D.
(Ⅰ)求证:PB1∥平面BDA1;
(Ⅱ)求二面角A-A1D-B的平面角的余弦值;
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075338-33040.gif)
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