题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072355-59793.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072355-25707.png)
(1)证明:A1B1⊥C1D;
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072356-97471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072356-74380.jpg)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072356-10581.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072356-52536.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072356-78159.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072356-60207.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072357-17753.png)
M-DE-A的大小为∏|3
解析
核心考点
试题【(本小题满分12分)在直三棱柱ABC—A1B1C1中,∠ACB=90°,AC=BC=AA1=1,D、E分别为棱AB、BC的中点,M为棱AA1上的点。(1)证明:】;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/20191022/20191022072346-82356.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072347-96506.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072347-70220.png)
点
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072347-40136.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072347-50668.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072347-41107.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072347-45116.png)
(Ⅰ)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072347-63664.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072347-78915.png)
(Ⅱ)当
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072347-40136.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072347-76833.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072348-30495.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072347-78915.png)
(Ⅲ)是否存在点
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072347-50668.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072348-79997.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072348-22820.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072333-44281.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072333-18557.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072334-26118.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072334-40273.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072334-44236.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072334-90951.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072334-83510.png)
(Ⅰ)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072335-41366.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072335-16987.png)
(Ⅱ)当
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072334-40273.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072335-67344.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072335-16046.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072335-16987.png)
(Ⅲ)是否存在点
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072334-44236.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072336-18133.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072336-72261.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072326-95544.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072327-29462.png)
A.若![]() ![]() | B.若![]() ![]() |
C.![]() | D.若![]() ![]() |
①若a
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072320-62478.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072320-25904.png)
③平面α∥平面β,a
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072320-25904.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072320-25904.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072320-25904.png)
A.1个 | B.2个 | C.3个 | D.4个 |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072303-20639.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072304-92927.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072304-73550.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072304-33767.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072304-56883.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072305-57543.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072305-95855.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072305-20276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072305-91245.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072306-28166.png)
(1) 求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072306-74183.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072306-51248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072306-64664.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072306-74183.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072307-25217.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072306-74183.png)
(2) 设
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072307-28550.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072307-92704.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072303-20639.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072304-92927.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072308-96012.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072306-74183.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072308-19462.png)
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