题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090603-45179.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090603-82346.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090604-33117.png)
(1)求证:直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090604-86881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090604-27971.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090605-65694.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090604-27971.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090605-22493.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090605-53975.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090604-86881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090605-68979.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090606-45904.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090604-27971.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090606-26168.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090604-86881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090606-82047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090606-17123.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090607-89026.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090607-66573.png)
解析
试题分析:(1)证明:由
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090604-86881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090607-99533.png)
故
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090604-86881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090606-82047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090606-17123.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090607-89026.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090607-75946.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090605-68979.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090604-27971.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090608-43398.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090604-86881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090604-27971.png)
(2)由题知
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090608-79316.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090608-63040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090608-42445.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090608-84793.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090609-89162.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090609-28184.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090609-87400.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090609-99674.png)
点评:定点直线系:若
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090609-45551.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090610-73803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090610-58928.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090610-17125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090609-45551.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090610-58928.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090610-73803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090610-92437.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090555-36268.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090555-57187.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090556-67309.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090556-67309.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090552-51042.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090552-60503.png)
A.内切 | B.相交 | C.外切 | D.相离 |
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090545-49780.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090545-99993.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090545-83407.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090546-90155.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023090546-87848.png)
A.0条 | B.2条 | C.3条 | D.4条 |
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