题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014740-86805.jpg)
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014741-62426.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014741-68564.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014741-28493.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014741-64586.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014742-52215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014742-44035.png)
∵A,P,M和B,P,N分别共线,∴存在λ,μ∈R,
使
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014742-37351.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014741-28493.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014742-95832.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014742-44035.png)
故
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014743-73691.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014742-95832.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014742-37351.png)
而
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014743-73691.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014743-43157.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014743-30439.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014744-37233.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014744-29470.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014742-37351.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014744-25646.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014744-74815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014745-42750.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014736-62632.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014736-92011.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014736-12029.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014737-41205.jpg)
A.m>0,n>0 | B.m>0,n<0 |
C.m<0,n>0 | D.m<0,n<0 |
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014730-41863.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014731-93543.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014731-52003.png)
A.A,B,D | B.A,B,C |
C.B,C,D | D.A,C,D |
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014724-22859.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014724-17586.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014724-21038.png)
A.(x-1)2+(y-2)2=5 | B.3x+2y-11=0 |
C.2x-y=0 | D.x+2y-5=0 |
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014718-75122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014718-45795.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014719-52014.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014719-64768.jpg)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014710-93285.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014710-11923.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014710-49411.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014711-62432.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014711-78837.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014711-15236.jpg)
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