题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113306-71746.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113307-91398.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113306-71746.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113306-71746.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113307-91398.png)
A.-3 | B.1 | C.-3或1 | D.3或1 |
答案
解析
试题分析:|a|=
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113307-46019.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113307-98535.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113258-34197.png)
(1)求证:直线BD⊥平面OAC;
(2)求直线MD与平面OAC所成角的大小;
(3)求点A到平面OBD的距离。
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113246-65641.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113246-10133.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113246-10133.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113246-31366.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113246-69508.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113246-57218.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113246-78507.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113246-69538.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113247-78398.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113247-75975.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113246-31366.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113247-38985.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113247-11246.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113247-25937.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113247-97809.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113247-61116.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113247-10374.png)
(2)求直线
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113247-62346.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113248-96013.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113228-36254.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113229-36406.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113229-87758.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113229-73036.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113229-39314.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113230-24412.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113230-81079.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113230-63019.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113230-75103.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113231-89718.png)
(1)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113231-94412.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113231-77413.png)
(2)求面
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113231-21636.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113231-77413.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113216-77451.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113216-49418.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113216-30967.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113216-90112.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113216-20183.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113217-80028.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113217-59244.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113217-11921.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113217-70349.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113217-12393.png)
(2)求二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113217-83767.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113209-87297.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105113209-96794.png)
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