题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155609-70704.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155609-47995.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155609-24829.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155610-97550.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155610-33232.png)
(Ⅰ)若一次投放4个单位的药剂,则有效治污时间可达几天?
(Ⅱ)若第一次投放2个单位的药剂,6天后再投放
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155610-85933.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155610-85933.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155610-80378.png)
解析
试题分析:(Ⅰ)先由
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155610-93258.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155611-94855.png)
(Ⅱ)先得出模型当
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155611-84577.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155611-76947.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155612-16215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155612-66274.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155612-12925.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155610-80378.png)
试题解析:(I)∵
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155610-93258.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155611-94855.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155613-39813.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155613-51693.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155613-77753.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155613-39813.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155614-16358.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155614-37880.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155614-97428.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155614-17411.png)
综上,得
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155615-31870.png)
(II)当
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155611-84577.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155611-76947.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155615-68435.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155615-45741.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155612-16215.png)
当且仅当
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155615-34007.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155616-38284.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155612-66274.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155612-12925.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155610-80378.png)
核心考点
试题【某校课外兴趣小组的学生为了给学校边的一口被污染的池塘治污,他们通过实验后决定在池塘中投放一种能与水中的污染物质发生化学反应的药剂.已知每投放个单位的药剂,它在水】;主要考察你对函数的相关概念等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155551-46215.png)
(1)求证:f(x)是周期为4的周期函数;
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155536-27765.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155448-48922.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155448-45152.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155449-66704.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155406-43727.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155406-22687.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155406-53473.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155406-50457.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155407-11093.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155407-41006.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155406-22687.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155346-36605.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155347-15059.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155347-16378.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155347-75454.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155347-94974.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204155348-80106.png)
A.1 | B.2 | C.3 | D.4 |
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