题目
题型:解答题难度:一般来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054104-74501.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054104-51831.png)
(1)如图,点
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054104-61591.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054104-32404.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054104-19337.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054105-39589.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054105-73552.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054105-33016.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054105-73552.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054105-24042.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054105-17130.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054106-65592.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054104-19337.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054106-71004.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054106-99356.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054106-95642.png)
(2)如图:
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054106-53392.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054104-61591.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054107-73564.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054107-20823.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054105-24042.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054105-17130.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054106-65592.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054104-19337.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054107-34583.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054105-24042.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054107-71330.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054107-47441.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054108-65188.png)
(2)点Q的速度为9m/s或2.8m/s
解析
试题分析:(1)设再经过ts后,点P、Q相距5cm,
①P、Q未相遇前相距5cm,依题意可列
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054108-18786.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054108-13156.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054108-30866.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054109-24369.png)
(2)点P,Q只能在直线AB上相遇,则点P旋转到直线AB上的时间为
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054109-44096.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054109-30736.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054109-21054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054109-19539.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054109-40065.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054110-87261.png)
点评:本题考查的是一元一次方程的综合应用两道题都要分两种情况进行讨论,学生做此题时需要谨慎
核心考点
试题【已知:线段.(1)如图,点沿线段自点向点以厘米/秒运动,点出发秒后,点沿线段自点向点以厘米/秒运动,问再经过几秒后相距? (2)如图:,点绕着点以的速度逆时针旋】;主要考察你对一元一次方程的概念等知识点的理解。[详细]
举一反三
小马:你还累?这么大的个,才比我多驮了2个。
老牛:哼,我从你背上拿来1个,我的包裹数就是你的2倍!
小马:真的?!”
根据老牛和小马的对话,你能求出它们各驮了多少个包裹吗?
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054059-37917.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054053-91006.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054053-28750.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054053-48236.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821054051-46233.png)
A.![]() | B.![]() | C.![]() | D.6 |
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