题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012823-68268.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012823-24365.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012823-79904.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012824-58255.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012824-79990.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012824-64599.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012824-87180.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012825-80809.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012825-57009.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012825-70638.png)
A.(0,![]() | B.(![]() ![]() | C.(![]() ![]() | D.(![]() ![]() |
答案
解析
由
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012826-30644.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012826-82656.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012827-24911.png)
∵|
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012827-93072.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012827-20198.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012828-57993.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012828-87419.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012828-29867.png)
∵(x﹣a)2+y2=1,∴y2=1﹣(x﹣a)2≤1,
∴y2≤1
同理x2≤1
∴x2+y2≤2②
由①②知
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012828-65506.png)
∵|
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012829-81177.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012829-16547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012829-57168.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012829-67052.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012830-57298.png)
故选D.
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012830-16927.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012814-10715.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012814-70366.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012814-51169.png)
A.一定为锐角三角形 | B.一定为钝角三角形 |
C.一定为直角三角形 | D.可以为任意三角形 |
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012800-38027.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012801-63680.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012801-49821.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012801-65597.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012801-48262.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012801-98123.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012801-65583.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012801-49104.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012801-79215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012755-86350.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012755-68982.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012755-34746.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012750-12553.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012750-57929.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012750-79827.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012750-97111.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012751-83637.png)
已知复数
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012740-11987.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012740-26768.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012741-75682.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012741-27273.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012741-83211.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012741-49536.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012741-24600.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012741-89045.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105012741-32151.png)
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