题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211141-35423.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211141-35214.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211141-42072.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211141-34317.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211141-44468.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211142-98847.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211142-20182.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211142-17959.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211142-43828.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211143-12478.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211141-44468.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211143-24413.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211143-50207.gif)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211143-22770.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211143-35917.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211144-15138.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211144-44520.gif)
即t = 0时,
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211144-97488.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211144-67841.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211144-23417.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211142-43828.gif)
(2)由
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211145-69904.gif)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211145-42466.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211145-52675.gif)
令
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211145-45011.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211146-57396.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211146-52226.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211146-49863.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211146-52226.gif)
设
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211146-41411.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211146-12609.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211143-12478.gif)
核心考点
举一反三
(1)若D是BC的中点,求证:AD⊥CC1;
(2)过侧面BB1C1C的对角线BC1的平面交侧棱于M,若AM=MA1,求证:截面MBC1⊥侧面BB1C1C;
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211135-73614.gif)
(3)AM=MA1是截面MBC1⊥平面BB1C1C的充要条件吗?请你叙述判断理由.
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211126-23877.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211126-43397.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211126-38183.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211126-19493.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211126-43397.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211117-37427.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211117-61794.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211109-15572.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022211109-71873.gif)
A.(-4,5) | B.(-3,4) |
C.(-3,4)或(-1,2) | D.(-4,5)或(0,1) |
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