题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071017-56410.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071017-56410.png)
A.a⊥b且a与b相交 | B.a⊥b且a与b不相交 |
C.a⊥b | D.a 与b不一定垂直 |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071018-42972.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071018-49221.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071018-71286.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071018-76826.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071018-53488.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071019-27427.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071019-16229.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071013-29707.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071013-28724.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071013-14377.png)
A.![]() | B.45° | C.![]() | D.90° |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071013-66333.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071004-40155.png)
A、若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071004-86062.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071004-29624.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071005-45609.png)
B、若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071005-22208.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071005-52839.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071005-45609.png)
C、若点A、B不在直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071005-84908.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071005-84908.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071005-84879.png)
D、若三条直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071004-40155.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071004-40155.png)
如图,已知正方体
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070957-54214.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070957-56784.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070957-12057.png)
(1)求三棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070957-14389.png)
(2)求异面直线EF与AB所成角的大小(结果用反三角函数值表示).
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070958-90003.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070948-77175.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070948-48025.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070948-73037.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070949-90881.png)
在直三棱柱
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070937-14646.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070937-67034.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070937-37593.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070937-29068.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070938-51736.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070938-77181.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070938-84270.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070938-73515.png)
(2)求直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070938-27605.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070938-97105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022070938-94785.png)
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