题目内容
如图是一个二次函数
的图
象.
(1)写出这个二次函数的零点;
(2)写出这个二次函数的解析式及
时函数的值域
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/201408231910269303169.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823191026868412.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/2014082319102688472.gif)
(1)写出这个二次函数的零点;
(2)写出这个二次函数的解析式及
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823191026899436.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/201408231910269303169.jpg)
解 .(1)由图可知这个二次函数的
零点为
(4分)
(2)可设两点式
,又过
点,代入得
, ![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823191027071128.gif)
,
其在
中,
时递增,![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823191027133334.gif)
时递减,
最大值为
又
,
最大值为0,![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823191027071128.gif)
时函数的值域为![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823191027274416.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/2014082319102693072.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823191026946430.gif)
(2)可设两点式
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823191026977658.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823191026993297.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823191027008236.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823191027071128.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823191027086550.gif)
其在
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823191026899436.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823191027118452.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823191027133334.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/2014082319102714965.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823191027071128.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823191027180332.gif)
又
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823191027196608.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823191027071128.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823191027071128.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823191026899436.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823191027274416.gif)
略
![](http://thumb2018.1010pic.com/images/loading.gif)
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