题目
题型:解答题难度:一般来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062148-85351.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062148-89494.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062148-85351.png)
(2)在区间
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062148-52912.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062148-99805.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062148-53803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062149-38724.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062149-79172.png)
解析
(1)由题意知x=0与x=1是方程f(x)-7=0的两个根,故解决本题宜将函数设为两根式,这样引入的参数最少,然后再利用函数最值为8,即f(x)-7的最大值为8建立方程求参数.
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062149-44056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062149-48285.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062149-42007.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062150-65098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062150-36709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062150-65098.png)
解:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062150-66434.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062150-36477.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062150-43263.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062151-80450.png)
设
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062151-54380.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062151-97263.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062151-90905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062151-26167.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062152-90957.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062152-60821.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062149-44056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062149-48285.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062149-42007.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062150-65098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062150-36709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062150-65098.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062152-17813.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062150-65098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062152-56956.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062152-49534.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062153-86024.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062153-51320.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062153-66201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062150-36477.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062153-71702.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062150-36477.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062153-51229.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062153-51229.png)
核心考点
试题【二次函数满足的最大值是8,(1)求的解析式;(2)在区间上,的图象恒在的上方,试确定的范围。】;主要考察你对一次函数的图象和性质等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062142-71234.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062142-85162.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062143-43208.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062143-11185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062143-71416.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062143-11249.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062143-32539.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062144-63487.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062138-51250.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062139-92616.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062139-78624.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062139-20261.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062139-55997.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062139-55285.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062140-57288.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062140-68929.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062135-30701.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062135-84926.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062135-64609.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062131-26875.png)
(1)画出函数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062131-17307.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062131-61302.png)
(2)若直线
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062131-69198.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062131-17307.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062131-85805.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062120-70416.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062120-19878.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062120-49928.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062120-45200.png)
(1)试写出
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062120-45200.png)
(2)作出
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062120-45200.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062120-45200.png)
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