题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092223-52647.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092223-20565.gif)
试判断圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092224-25259.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092224-38967.gif)
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092224-25259.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092224-38967.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092224-77727.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092224-15859.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092225-84916.gif)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092225-54681.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092225-45961.gif)
把上式代入
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092225-81459.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092226-85372.gif)
方程
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092226-29048.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092226-29994.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092226-96866.gif)
所以,方程
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092226-29048.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092227-43018.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092227-12227.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092227-43018.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092227-12227.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092225-54681.gif)
得到
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092227-79006.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092227-81456.gif)
因此圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092224-25259.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092224-38967.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092227-84100.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092228-62384.gif)
解法二:把圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092224-25259.gif)
得
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092228-91971.gif)
圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092224-25259.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092228-76596.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092228-93868.gif)
把圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092224-38967.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092229-36486.gif)
圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092224-38967.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092229-91963.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092229-15698.gif)
圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092224-25259.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092224-38967.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092229-47822.gif)
圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092224-25259.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092224-38967.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092230-21722.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092230-71718.gif)
而
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092230-13441.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092230-15512.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092224-25259.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092224-38967.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092231-24366.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092231-24006.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092219-76410.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092219-80452.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023092219-15287.gif)
A.相离 | B.外切 | C.内切 | D.相交 |
A.(x-5)2+(y+7)2="25" | B.(x-5)2+(y+7)2=17或(x-5)2+(y+7)2=15 |
C.(x-5)2+(y+7)2="9" | D.(x-5)2+(y+7)2=25或(x-5)2+(y+7)2=9 |
A.r<![]() | B.r>![]() | C.|r-![]() | D.|r-![]() |
A.(a-b)2=c2 | B.(a-b)2=2c2 | C.(a+b)2=c2 | D.(a+b)2=2c2 |
A.4条 | B.3条 | C.2条 | D.1条 |
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