题目
题型:解答题难度:简单来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202933-82470.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202933-79966.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202933-79966.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202933-54858.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202934-66892.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202933-54858.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202934-73148.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202934-66892.gif)
(1) 求每户每月水费
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202934-12865.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202934-92171.gif)
(2) 该市一家庭今年第一季度每月的用水量和支付
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202934-96245.gif)
月份 | 用水量(立方米) | 水费(元) |
一 | 4 | 17![]() |
二 | 5 | 23 |
三 | 2.5 | 11 |
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202935-38531.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202935-76239.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202935-46222.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202934-96245.gif)
(2)∵
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202935-46222.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202936-53732.gif)
由于该家庭今年一、二月份的水费均大于14元,故用水量4立方米,5立方米都大于最低限量
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202933-54858.gif)
将
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202936-89906.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202936-91388.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202936-28627.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202936-86243.gif)
两式相减, 得
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202937-83985.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202937-90994.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202937-27726.gif)
又三月份用水量为2.5立方米,
若
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202937-99731.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202937-56052.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202936-28627.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202938-29312.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202937-27726.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202938-12868.gif)
将
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202939-52253.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202939-40907.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202939-16397.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202934-96245.gif)
由
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202939-15573.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202939-73310.gif)
答:该家庭今年一、二月份用水超过最低限量,三月份用水没有超过最低限量,
且
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202940-68097.gif)
解析
核心考点
试题【(本小题满分14分)我国是水资源比较贫乏的国家之一,各地采用价格调控等手段以达到节约用水的目的.某市用水收费标准是:水费基本费超额费定额损耗费,且有如下三条规定】;主要考察你对指数函数图象及性质等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202931-86555.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202931-41455.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202932-89504.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202932-34189.gif)
设函数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202922-88972.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202922-60540.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202923-63304.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202923-76124.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202923-11419.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202923-70389.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202923-57604.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202923-88176.gif)
(1)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202924-23317.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202924-33866.gif)
(2)设函数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202924-99365.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202924-48723.gif)
(3)若不等式
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202925-33933.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202925-81023.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202925-51300.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202920-36422.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202920-14511.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202918-26180.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202918-65391.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202918-18629.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202918-12273.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202918-66544.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202918-41813.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202919-29919.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202919-34235.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202919-28254.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202919-71370.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202912-11024.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819202913-42781.png)
A.1 | B.2 | C.3 | D.4 |
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