题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021902-93547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021902-37969.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021902-93547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021902-39044.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021902-37969.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021902-39044.png)
A.相交 | B.![]() ![]() | C.![]() ![]() ![]() | D.![]() ![]() ![]() ![]() ![]() |
答案
解析
试题分析:由题意可知,若m在平面
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021902-39044.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021902-37969.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021902-39044.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021902-39044.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021902-37969.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021903-88486.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021902-39044.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021852-37491.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021853-61486.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021853-31975.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021853-55424.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021853-54451.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021853-78287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021853-91068.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021854-62305.png)
(1)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021854-58582.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021853-61486.png)
(2)在线段
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021854-84109.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021854-69686.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021854-21759.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021855-71794.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021854-69686.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021838-76652.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021838-96205.png)
A.![]() ![]() ![]() ![]() ![]() |
B.![]() ![]() ![]() ![]() |
C.![]() ![]() ![]() ![]() ![]() ![]() |
D.![]() ![]() ![]() ![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021826-21739.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021826-13906.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021826-13906.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021826-88777.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021826-27715.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021827-81531.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021827-79236.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021827-57662.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021828-81377.jpg)
(Ⅰ)求三棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021828-53594.png)
(Ⅱ)当点
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021827-79236.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021827-57662.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021828-66469.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021828-14189.png)
(Ⅲ)证明:无论点
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021827-79236.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021827-57662.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021829-92097.png)
A.l![]() ![]() |
B.l![]() ![]() ![]() |
C.m![]() ![]() |
D.l![]() |
A.l![]() ![]() |
B.l![]() ![]() ![]() |
C.m![]() ![]() |
D.l![]() |
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