题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135157-97976.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135157-16295.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135157-26563.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135157-47942.png)
(1)根据图象,求一次函数
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135157-26563.png)
(2)设公司获得的毛利润(毛利润=销售总价—成本总价)为
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135158-96367.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135157-16295.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135158-10265.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135158-74675.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135158-77879.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135159-77087.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135159-95299.png)
解析
试题分析:(1)由于为一次函数所以只需从图中找两点坐标代入即可;(2)销售总价
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135159-16920.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135159-84141.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135159-16920.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135159-84141.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135200-18233.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135200-43499.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135200-61753.png)
试题解析:⑴由图象知,当
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135200-11531.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135201-50432.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135201-83169.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135201-85157.png)
分别代入
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135201-87708.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135202-65258.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135202-86722.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135202-68855.png)
⑵销售总价
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135202-48035.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135203-11710.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135203-33220.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135202-48035.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135203-11710.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135203-11700.png)
代入求毛利润的公式,得
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135203-74590.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135204-44331.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135204-85733.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135204-12168.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135205-42307.png)
答:当销售单价为
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135205-92029.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135205-28732.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135205-80250.png)
核心考点
试题【某公司试销一种成本单价为500元/件的新产品,规定试销时销售单价不低于成本单价,又不高于800元/件.经试销调查,发现销售量(件)与销售单价(元/件)可近似看作】;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/20200204/20200204135121-48491.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135121-76516.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135121-86032.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135121-48491.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135122-57685.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135122-69514.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135122-83367.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135122-79070.png)
(3)若
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135122-11258.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135121-48491.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135123-25366.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135110-82346.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135112-32664.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135113-27476.png)
(2)在该团中随机采访2名游客,求其中持金卡与持银卡人数相等概率.
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135051-69984.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135055-32574.png)
(1)该公司已有100万元资金,并全部投入A,B两种产品中,其中x万元资金投入A产品,试把A,B两种产品利润总和表示为x的函数,并写出定义域;
(2)在(1)的条件下,试问:怎样分配这100万元资金,才能使公司获得最大利润?其最大利润为多少万元?
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135029-74368.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135029-42527.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135029-39019.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135029-98045.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135030-70233.png)
A.![]() ![]() ![]() | B.![]() ![]() ![]() |
C.![]() ![]() ![]() | D.![]() ![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204134918-74465.png)
(1)求集合A;
(2)设集合B={x
题型:x+4|<a},若集合B是集合A的子集,求a的取值范围.