题目
题型:单选题难度:一般来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819125517-48618.png)
A.6 | B.5 | C.4 | D.3 |
答案
解析
试题分析:本题主要考查实根个数. 令
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819125517-49267.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819125518-15900.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819125518-12550.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819125518-84945.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819125518-28055.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819125518-83010.png)
所以可以考虑,有交点时
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819125519-77724.png)
1、当
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819125519-13370.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819125519-74078.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819125518-15900.png)
2、当
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819125520-89768.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819125519-74078.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819125518-15900.png)
3、当
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819125519-13370.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819125519-74078.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819125518-15900.png)
4、当
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819125520-17576.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819125519-74078.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819125518-15900.png)
所以方程相等的实数根的个数为6个。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000724-74564.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000725-21303.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000726-12205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000726-96014.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000726-80918.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000727-85238.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000727-44604.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000726-80918.png)
①集合
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000727-36525.png)
②若
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000727-71648.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000727-18546.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000727-35696.png)
③若
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000727-75534.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000727-18546.png)
④若
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000727-30639.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000726-80918.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000728-27709.png)
其中正确的结论是 .(填上你认为所有正确的结论序号).
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000732-10290.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000732-53758.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000732-67881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000732-60870.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000732-50848.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000732-67881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000734-46203.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000734-49228.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000735-97398.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000737-77075.png)
①
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000737-32389.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000737-86932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000737-46098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000737-52063.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000738-47940.png)
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