题目
题型:解答题难度:一般来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163919-91499.png)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163919-94055.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163919-35441.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163919-39973.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163920-78694.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163920-79425.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163920-90414.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163920-46998.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163920-92903.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163921-82918.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163921-62442.png)
解析
试题分析:(1)将k=-4代入函数解析式,利用指数函数的性质即可求出答案;(2)利用
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163920-78694.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163920-90414.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163921-38408.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163921-26115.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163922-37936.png)
解:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163920-92903.png)
(2)由题意知
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163921-38408.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163922-62056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163922-74592.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163921-26115.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163922-37936.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163922-55740.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163922-85073.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163922-40426.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163921-82918.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163923-55599.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163923-52555.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163923-98910.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163923-38250.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163923-23245.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163921-62442.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163924-38551.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163924-41793.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163924-19322.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163924-11099.png)
综上所述,
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163921-82918.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163921-62442.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163916-12113.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163912-58365.png)
(1)试写出y关于x的函数关系式,并写出定义域;
(2)当k=50米时,试确定座位的个数,使得总造价最低?
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163910-51544.png)
A.(0,1) | B.[0,1) | C.(0,1] | D.[0,1] |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163907-14761.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817163905-56974.png)
A.(0,1) | B.[0,1) | C.(0,1] | D.[0,1] |
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