题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025534-97140.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025534-59808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025534-97140.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025534-59808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025534-97140.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025534-59808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025534-97140.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025534-73796.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025535-21032.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025534-59808.png)
⑴求船在静水中的速度和水流的速度;
⑵求甲、乙两人相遇的时间和距
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025534-97140.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025535-58999.jpg)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025535-59210.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025535-11593.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025541-95955.png)
解得
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025542-23875.png)
答:船在静水中的速度和水流的速度分别为50千米/时、10千米/时
⑵设第一次相遇用时为
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025542-39071.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025542-93183.png)
解得
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025542-35101.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025542-26553.png)
设第二次相遇用时为
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025543-80062.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025543-84384.png)
解得
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025543-39461.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025543-14141.png)
答:
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025544-12929.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025534-97140.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025544-80489.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025534-97140.png)
解析
(2)设第一次相遇用时为x1小时,2×15+15x1=60x1;设第二次相遇用时为x2小时,2×15+15x2=120﹣30(x2﹣2),分别求出即可.
核心考点
试题【已知、两地相距120千米,甲乘坐一橡皮筏从地顺流去地,2小时后,乙坐船从地出发去地.如图为甲、乙两人离地的路程(千米)与乙行进的时间(小时)的函数图象.乙到达地】;主要考察你对一次函数定义等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025519-35800.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025519-40103.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025519-20687.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025520-36284.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025520-67818.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025519-20687.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025520-83850.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025520-84009.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025520-83850.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025520-81347.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025519-35800.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025519-20687.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025521-18505.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025521-55069.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025521-18505.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025521-55069.png)
⑴点
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025520-67818.png)
⑵如图1,若点
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025521-18505.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025521-87573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025520-83850.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025521-32261.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025521-71851.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025521-32261.png)
⑶如图2.若以点
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025521-18505.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025522-51837.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025522-51837.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025522-46403.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025522-26920.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025522-26920.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025522-16981.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025522-16981.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025522-21720.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025516-65106.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025516-87028.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025516-83809.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025509-42997.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025509-45404.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025510-44229.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025510-56084.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025510-38771.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025510-81935.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025510-66698.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025510-26074.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025510-70617.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025510-86377.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025511-44380.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025511-92605.png)
商品类型 | 甲 | 乙 | 丙 |
每个集装箱装载量(吨) | 8 | 6 | 5 |
每吨价值(万元) | 12 | 15 | 20 |
(1)如果甲种商品装
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025502-62689.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025502-41128.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025502-41128.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025502-62689.png)
(2)如果其中5个集装箱装了甲种商品,求每个集装箱装载商品总价值的中位数.
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025458-88040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025458-40389.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025458-79223.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191016/20191016025459-72613.png)
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