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第一百零四章 咱们走着瞧(2 / 2)

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“追及问题的要点是‘追及路程’和‘速度差’,这是解答这类问题的两个基本条件,也是解答时最重要的思考方向。有几个追及问题的基本关系你一定要记清楚:

追及路程÷速度差=追及时间

速度差x追及时间=追及路程

追及路程÷追及时间=速度差

只要记着这三个关系式,大部分追及问题都能解决。例如你的这道题,我们可以通过画图来分析题意。

从题目中我们可以发现,甲乙二人从出发到甲追上乙所用的时间是一样的。在这段时间里,甲走的路程是ac,乙走的路程是bc。甲比乙多走的路程就是ab村之间的距离。我们又知道,甲比乙每小时多走14-5=9千米,到最后追上的时候要多走18千米,很显然追击时间就是:

18÷(14-5)=18÷9=2

也就是:

追及路程÷速度差=追及时间

所以,最后答案就是,2小时后甲可以追上乙。

怎么样,明白了吗?”

卓小雅毕竟是有基础的,一点就通,有了那几个关系式一套,这种问题再要解决起来,似乎就很简单了,于是冲小呆瓜甜甜一笑:

“我明白了,谢谢你,你讲得真的特别清楚!”

小呆瓜这才有点不好意思地挠挠头:“也没有,瞎讲罢了!嘿嘿……”

本小章还未完,请点击下一页继续阅读后面精彩内容!“可我有点不明白!”一直在一边默默听着的小南瓜突然道。

“你不明白不是很正常吗?”卓小雅不耐烦道,觉得这人真是烦透了,天天往这里跑有什么意思?说那么难听的话都不肯走,脸皮可真厚。

小南瓜没有理会卓小雅在说什么,直接向小呆瓜提出了自己的疑『惑』:

“你怎么知道甲追上乙的地方是在c那里,而不是更近一点的地方或是更远一点的地方?如果是远一点的地方,追上的时间是不是要更长一点?”

这个问题一问,卓小雅“噗呲”一声笑了出来,然后嘲讽道:“我说严小禾同学,你就不要在这里秀智商了吧?也不嫌……”

“其实你把那个点移近一点或远一点都没有关系,”小呆瓜打断了卓小雅的话,对小南瓜解释道:

“因为那只是一个假设的他们相遇的点,而你所说的时间长一点或短一点是不存在的,因为他们的速度是一定的,相隔的距离也是一定的,那么甲追上乙的时间也就是一定的,不会有第二种答案。你能明白吗?”

看着小呆瓜认真的表情,小南瓜突然想起了他们目前的敌对状态,还有他让自己受的屈辱……

于是,小南瓜头一昂,挑衅似的道:“有什么了不起,你以为就你们聪明吗?咱们走着瞧!”

说完,拿着月饼,狠狠地给了小呆瓜和卓小雅一个大大的白眼后扭头离开。

倒是小呆瓜,看着小南瓜离去的背影,嘴角微不可察地『露』出了一丝笑意。

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