“龟兔赛跑”是同学们熟悉的寓言故事．如图所示，表示了寓言中的龟、兔的路程S和时间t的关系（其中直线段表示乌龟，折线段表示

A abbit and a tortoise have a race.The rabbit runs fastly but the tortoise runs slowly. The rabbit thinks he must win,so he falls asleep.The tortoise doesn't stop.At last,the tortoise win.

The Rabbit And The Turtle
One day,a turtle is climbing.A rabbit sees the turtle.It asks the turtle:“Hi,turtle.What are you doing?” “I’m running.” The turtle says.“Haha,you are running?How slowly!Let’s have a race.Let’s see who runs fast.” The rabbit laughs at the turtle.“OK.i believe i will beat you” The turtle says.
The next day is a sunny day.The turtle and the rabbit are ready for a game.Many animals are watching.“Three !Two!One!Start!” monkey says.The rabbit and the turtle runs to the end.The rabbit runs very fast.The turtle is climbing with aslow but steady pace to the goal.It’s behind the rabbit.The rabbit runs to a tree.It sees the turtle is behind.It thinks:“The turtle is very slow.I can sleep under the tree.” So the rabbit was found a comfortable place,lie down and fell fast alseep.
The turtle climbs to the tree.It sees the rabbit is dleeping and doesn’t stop.In the end it gets to the end and is very happy!Now the rabbit wakes up.It thinks the turtle is still behind.The rabbit runs to the end.when ihe rabbit reached the end.It sees the turtle there.“Haha,I win!” the turtle says.The rabbit is very sad.It is crying.
This story tells us:we can’t be pride.

2
极限问题,乌龟每次往前跑的距离都在缩小,当时间大于某个值（兔子在这个时间跑的路程等于乌龟跑的路程加上原来领先兔子的距离）时,乌龟往前跑的距离为0,即兔子此后将超过乌龟.

One day the Hare laughed at the short feet and slow speed of the Tortoise.The Tortoise replied:
"You may be as fast as the wind,but I will beat you in a race!"
The Hare thought this idea was impossible and he agreed to the proposal.It was agreed that the Fox should choose the course and decide the end.
The day for the race came,and the Tortoise and Hare started together.
The Tortoise never stopped for a moment,walking slowly but steadily,right to the end of the course.The Hare ran fast and stopped to lie down for a rest.But he fell fast asleep.Eventually,he woke up and ran as fast as he could.But when he reached the end,he saw the Tortoise there already,sleeping comfortably after her effort.
The Rabbit And The Turtle
One day,a turtle is climbing.A rabbit sees the turtle.It asks the turtle:“Hi,turtle.What are you doing?” “I’m running.” The turtle says.“Haha,you are running?How slowly!Let’s have a race.Let’s see who runs fast.” The rabbit laughs at the turtle.“OK.i believe i will beat you” The turtle says.
The next day is a sunny day.The turtle and the rabbit are ready for a game.Many animals are watching.“Three !Two!One!Start!” monkey says.The rabbit and the turtle runs to the end.The rabbit runs very fast.The turtle is climbing with aslow but steady pace to the goal.It’s behind the rabbit.The rabbit runs to a tree.It sees the turtle is behind.It thinks:“The turtle is very slow.I can sleep under the tree.” So the rabbit was found a comfortable place,lie down and fell fast alseep.
The turtle climbs to the tree.It sees the rabbit is dleeping and doesn’t stop.In the end it gets to the end and is very happy!Now the rabbit wakes up.It thinks the turtle is still behind.The rabbit runs to the end.when ihe rabbit reached the end.It sees the turtle there.“Haha,I win!” the turtle says.The rabbit is very sad.It is crying.
This story tells us:we can’t be pride.

The rabbit grew four legs,on leap on jump,run quick.The tortoise also grew four legs,climb ah,climb ah,climb really slowly.One day,the rabbit runs into the tortoise,saying smilingly:" Tortoise,tortois...

晕死、这是几年级的题啊

跑完全程后兔子所用的时间是乌龟的20%.
那么乌龟每分钟跑50米.
跑完全程兔子只用了4分钟,乌龟用了20分钟.

选A.
兔子快速移动的时候,在哪个瞬间都比乌龟的瞬时速度快.
至于平均速度,是根据你完成比赛所用的时间决定的,所以输的那个平均速度最慢.
而位移是一样的,都是起点到终点.

One day a hare saw a tortoise walking slowly along and began to laugh and mock him. The hare challenged the tortoise to a race and the tortoise accepted. They agreed on a route and started off the race. The hare shot ahead and ran briskly for some time. Then seeing that he was far ahead of the tortoise, he thought he'd sit under a tree for some time and relax before continuing the race.He sat under the tree and soon fell asleep. The tortoise, plodding on, overtook him and finished the race. The hare woke up and realized that he had lost the race.

你任选一篇
1 After the tortoise than the rabbit said,proud of all the animals do not post.Some people say it,it is proud to say:"even the legs of rabbits but I have run,what do you count?" Rabbit unconvinced everyday practice run,a decision(再跟)turtle Yijuecixiong.Training for a few days,rabbits in the "Forest Journal," to the war on the turtle.Turtle accepted.Unwittingly race that day,turtles and rabbits are standing on the starting line.With the "bang" sound of rabbits and turtles are out of the starting line,and soon,the rabbit would Shuaixia the tortoise,the lead.Rabbit Bozhaobozhao suddenly heard shouting "help" the sound of a rabbit stopped,only a small Lark fell into the sea,has been quick to die,rabbits think:not refusing.Will not hesitate to jump into the river,although the river is not deep,fast-flowing,rabbits will not waterborne,it can only small Lark difficult to travel to.It so happened that can run from waterborne the tortoise,rabbit busy shouting:"turtle,Come Back on the Skylark." Turned a deaf ear turtle,I thought:If I go into the sea will be lost rabbits,no doors!End also want to run again.Rabbit had rescued a small Lark,which has wasted a lot of time,rabbits rush farewell small Lark,Batuijiubo.When the rabbit get to the end,the host elephant Baba is pegged to the turtle medals?Turtle see rabbits,proudly said:"Who let more nosy,deserves!" Was exactly at that time,sounded a loud voice:"medal should belong to the rabbit!" This is small Skylark.Qi asked why everyone,small Lark to the situation have said Yiwuyishi out."Yes,the rabbit should be a first!" "Gold medal to the rabbit!"…… Elephant Baba nodded,and the gold medal to hang rabbit.Finally turtle with a high low in the first
2One day the Hare laughed at the short feet and slow speed of the Tortoise.The Tortoise replied:
"You may be as fast as the wind,but I will beat you in a race!"
The Hare thought this idea was impossible and he agreed to the proposal.It was agreed that the Fox should choose the course and decide the end.
The day for the race came,and the Tortoise and Hare started together.
The Tortoise never stopped for a moment,walking slowly but steadily,right to the end of the course.The Hare ran fast and stopped to lie down for a rest.But he fell fast asleep.Eventually,he woke up and ran as fast as he could.But when he reached the end,he saw the Tortoise there already,sleeping comfortably after her effort.

《狼和小羊》
Aesop’s Fables
The Wolf and the Lamb
Once upon a time a Wolf was lapping at a spring on a hillside,when,looking up,what should he see but a Lamb just beginning to drink a little lower down.‘There’s my supper,’ thought he,‘if only I can find some excuse to seize it.’ Then he called out to the Lamb,‘How dare you muddle the water from which I am drinking?’
‘Nay,master,nay,’ said Lambikin; ‘if the water be muddy up there,I cannot be the cause of it,for it runs down from you to me.’
‘Well,then,’ said the Wolf,‘why did you call me bad names this time last year?’
‘That cannot be,’ said the Lamb; ‘I am only six months old.’
‘I don’t care,’ snarled the Wolf; ‘if it was not you it was your father;’ and with that he rushed upon the poor little Lamb and .WARRA WARRA WARRA WARRA WARRA .ate her all up.But before she died she gasped out .’Any excuse will serve a tyrant.’
要的话还有.
The Fox and the Crow
A Fox once saw a Crow fly off with a piece of cheese in its beak and settle on a branch of a tree.‘That’s for me,as I am a Fox,’ said Master Reynard,and he walked up to the foot of the tree.‘Good-day,Mistress Crow,’ he cried.‘How well you are looking to-day:how glossy your feathers; how bright your eye.I feel sure your voice must surpass that of other birds,just as your figure does; let me hear but one song from you that I may greet you as the Queen of Birds.’ The Crow lifted up her head and began to caw her best,but the moment she opened her mouth the piece of cheese fell to the ground,only to be snapped up by Master Fox.‘That will do,’ said he.‘That was all I wanted.In exchange for your cheese I will give you a piece of advice for the future .’Do not trust flatterers.’

小兔子骄傲自大,自以为自己跑得快,不去努力,结果导致自己的失败.小乌龟自强不息,踏踏实实,最终取得了成功.平时的学习中,稍微取得一点成绩,就沾沾自喜,觉得自己比别人强,学习也不如以前认真,后来考试成绩不理想,才知道自己不应该太骄傲.这故事说明,古人说得好,人外有人,天外有天.永远不要骄傲,要想取得最终成功,必须要通过自己的不懈努力.骄傲使人落后,谦虚使人进步

1

《龟兔赛跑》续写
自从和乌龟赛跑输了以后,小白兔一直很后悔.有一天,小白兔正闷闷不乐地在河边的草地上闲逛,忽然看见乌龟从河里爬了上来……
小白兔想了想,走到乌龟面前笑眯眯的说：“乌龟老弟,上次您可真是了不起啊!我们这回再来比一下,不过这次不光只比跑步,再比比游泳和拳击!”“好哇好哇!”乌龟听了连忙喜悦地说.说完,双方转眼间就跑回了家,开始做起了训练.到了第二天,小白兔和他的拉拉队与乌龟和他的“粉丝”一起来到了一条小河边.同时,他们的裁判大象伯伯和孔雀小姐也来到了兔子与乌龟vs的“战场”上.小白兔看见乌龟正在卖力地做准备活动时,也开始认真地做了起来.第一场“游泳”的比赛时间快要到了,双方站在起跑线上,当裁判说出“预备”的时候,他们双眼进盯着终点.“开始!”这时乌龟跳到了水里,一会儿仰泳,一会儿蛙泳,一会儿自由泳……游起来可舒服了!可是小白兔因为刚开始的时候没站稳,摔了一跤,还差点溺水.救生员小狗叔叔看见了立即跳进了水里,把小白兔救了出来,这才保住了他的那条小命.这时,小白兔突然听见了孔雀小姐说：“本次比赛的获胜者是乌龟!”原来,正在救小白兔的时候,乌龟已经轻松地游到对岸了.乌龟用着一种骄傲的眼神看着小白兔,小白兔想：“有什么了不起,游泳是你的长项,这回和我跑步,你就死定了.”他们又来到了一条400米的跑道前,“预备,开始!”小白兔快如闪电地冲了出去,乌龟也毫不示弱,仍然在努力地跑着.但在别人眼里,乌龟只不过是在悠闲地散步.不到1分钟的时间,小白兔就快速地到达了终点,但是乌龟才跑到四分之一的路程,差不多过了两小时,乌龟才跑完总路程.“游泳是你赢,跑步是我赢,我们就在这最后一个项目中一决高下吧!”小白兔认真地对乌龟说.最后,他们又来到了拳击场,当裁判说：“比赛开始!”的时候,小白兔就冲过去打乌龟,可总被乌龟坚硬的外壳挡住.但是由于乌龟的手法比较笨拙,所以还是打不到小白兔.就这样打了好几个回合.比赛时间到了,兔子和乌龟打成了平手,双方由于都想胜过对方,所以比较失望.
孔雀小姐见了,连忙安慰他们说：“友谊第一,比赛第二.你们不要再瞧不起对方了,这样会伤害朋友的友谊.你们应该成为一对好朋友哦!”小白兔和乌龟一听,立即停止了失望,开开心心地拉着手去玩了.从此,乌龟和小白兔成了一对很好的朋友,再也没有比过赛了.

用路灯,细雨,笑声写5初一

带入验算即可,先求乌龟全程用多少时间2100/20=105,然后带入,105-101=4分钟,兔子开始4分钟就睡了,兔子行进1200米,乌龟行进了80米,乌龟又爬了101分钟,共2020米到终点,这时兔子醒了继续跑,还有2100-1200=900米,刚好三分钟到达.正解101分钟

One day the Hare laughed at the short feet and slow speed of the Tortoise. The Tortoise replied: "You may be as fast as the wind, but I will beat you in a race!" The Hare thought this idea was impossible and he agreed to the proposal. It was agreed that the Fox should choose the course and decide the end. The day for the race came, and the Tortoise and Hare started together.

解题思路：兔子跑完全程所用时间为：2000÷320=6.25（分钟），乌龟跑完全程所用时间为：2000÷25=80（分钟），因为兔子和乌龟同时到达，所以兔子到达目的地实际所用时间为80分钟，减去兔子跑完全程用的时间就是兔子在途中睡觉的时间．

2000÷25-2000÷320
=80-6.25
=73.75（分钟）．
答：兔子在途中睡了73.75分钟才会和乌龟同时到达．

点评：
本题考点： 追及问题．

考点点评： 求出兔子和乌龟跑完全程实际所用时间，是解决本题的关键．

解题思路：物体运动快慢跟物体经过的路程和时间都有关系．在相同时间内，物体通过的路程越长，物体运动越快；在相同的路程内，物体用时越少，物体运动越快．

“龟兔赛跑”这个寓言故事中，在比赛刚开始时，由于在相同时间内兔子运动的路程长，所以兔子比龟运动快；
在整个比赛过程中，由于兔子中途睡觉，最终龟先到达终点，由于在相同路程内兔子所用的时间长，所以龟比兔子运动快．
故答案为：在相同时间内兔子运动的路程长；在相同路程内兔子所用的时间长．

点评：
本题考点： 运动快慢的比较．

考点点评： 知道物体运动快慢的影响因素，利用控制变量法判断物体运动快慢．

全程1.2单位是km不是km/h.
跑完全程所用时间：T乌龟=1.2/0.06=20h,T兔子=1.2/60=0.02h,两者一减就是兔子睡的时间了（够能睡的）.
刹车前的0.4s反应时间内车子还是108km/h（即30m/s）行驶.所以行驶了0.4*30=12米.
车距12+75=87m.

1.藏龙卧虎 2.捷足先登 3.品头论足 解释如下：
1. 藏龙卧虎 生肖虎在前 ,兔在中,龙在后 ,只有兔因此龙虎都藏起来了.
2. 捷足先登 跑得快的（即捷足）先到
3.品头论足 笼中装鸡兔是一类问题,主要计算鸡兔的数量 即“头”数 ,而条件一般只提供鸡兔的“足”的数量 .要算“头”数必须由“足”得出,因此为“品头论足”.

运动,因为乌龟以自己为参照物,然后看兔子就是运动的.

龟兔赛跑2000米,龟每分钟爬25米,兔每分钟跑320米.兔在途中睡了一觉,龟到终点时,兔离终点400米.兔在途中睡了多长时间?2000÷25?(2000?400)÷320=75(分钟)答：兔在途中睡了75分钟.

30000除以 25=1200（分）,30000除以300=100（分）,1200-100=1100（分）,1100+2=1102（分）
兔子跑100分钟到达终点,龟跑1200分钟到达终点,所以兔应比龟早到1100分,但事实上,兔晚到2两分钟,所以兔睡了1102分.

D

I think for an animal it's good to be slow. Let's take the story of the hare and the turtle as an example. According to the Chinese Zodiac, I am a hare, but I am not for running fast. This is because the story makes me realize that the fast runner tends to become too arrogant, whereas the slow one has perseverance, and perseverance is the key to success. I admire the turtle.
This is why I think slow is good.

1500/25=60分钟(1500-200)/325=4分钟
60-4=56分钟

大约是112分钟

解题思路：兔跑10分钟的路程为330×10=3300米，休息了200分钟后，龟行了（200+10）×30=6300千米，此时和兔子相距6300-3300=3000米，此时兔子开始追，追上龟所用时间为3000÷（330-30）=10分钟，此时又前行了30×10=300米，共行了6300+300=6600米，距终点还有7000-6600=400米．

兔追上龟的时间为：
[（200+10）×30-330×10]÷（330-30）
=[6300-3300]÷300，
=3000÷300，
=10（分钟）．
兔追上龟的时距中点的距离为：
7000-（3300+30×10），
=7000-6600，
=400（米）．
答：当兔追上龟时，离终点的距离是400米．

点评：
本题考点： 追及问题．

考点点评： 根据路程差÷速度差=追及时间求出兔子追上龟的时间是完成本题的关键．

兔子20千米/小时=1/3千米/分钟
乌龟3千米/小时=1/20千米/分钟
乌龟用时5.2x20=104分钟
兔子不停歇用时5.2X3=15.6分钟
1+2+3+4+5

75分钟

（1）乌龟爬完全程需要10000÷40=250分钟
兔子不睡觉,跑完全程需要10000÷400=25分钟
所以若兔子不想输给乌龟,则他在途中最多只能睡250-25=225分钟=3.75小时
综合列式
10000÷40-10000÷400=225（分钟）
（2）1.5小时=90分钟
路程至少要90×40÷（400-40）×400=4000米

可以用速度的变化来表示,

2分钟的时候全部在wc 集合“所有的枪都要丢在一坨” 裁判会倒数 喊道1就可以围着图跑一圈中途可以闪光可以雷 但是不能动手去搞别人 !再次跑到wc可以捡枪 记住只能打捡枪的 “不能藏枪” 差不多了把

乌龟92分钟；
兔子不算玩的,13.8；
1+3+5+7>13.8
则1+3+5+60+4.8分钟=78.8分钟
所以兔子先跑完
4.6-78.8*0.05=0.66千米

自从上次龟兔赛跑比赛后,兔子不服.
一天兔子便对乌龟说：“我们明天再来比赛.”乌龟答应了.
到了比赛那天,乌龟傻眼了,因为是比仰卧起坐,乌龟一个也做不起来.
这次,兔子终于赢了.它蹦蹦跳跳的跑到森林里去跟别的小动物们炫耀.
Since the last time the tortoise and the hare race,the rabbit not.
One day the hare said to the tortoise:"we come back tomorrow game." The tortoise agreed.
To the day of the race,the tortoise was dumbfounded,because it is the ratio of sit ups,the tortoise a do not.
This time,the hare won.It skipped into the woods with other small animal show.

A hare jeered at a tortoise for the slowness of his pace .But he laughed ,and said that he would run against her and beat her any day she would name ."Come on ," said the hare ,"you will soon see what...

答：设乌龟速度为X米/分钟,那么蚂蚁速度则为(X-0.2)米/分钟.
6/(X-0.2)-6/X=1
解得,X=1.2
所以,乌龟的速度为1.2米每分钟,蚂蚁的速度为1米每分钟.

龟兔赛跑第二部 - 想象作文 自从兔子输了上一次的比赛后,每一次见到别的小动物就害羞的跑开. 有一天,兔子碰到了小松鼠.松鼠非常同情兔子,于是对它说:“兔兄，你怎么着么没出息，不就是输了一次。”兔子红着脸底下了头说：“那我有什么办法，都已经输了，还要怎么样呢？”松鼠说：“上一次是应为你在半路睡着了，所以才让乌龟赢了，上一次可以不算术，你在去找乌龟，和它在比一次，不就把面子争回来了吗？”兔子听后高兴的一蹦三尺高说：“对啊，我怎么没有想到呢？”于是兔子来到乌龟家里，对乌龟说：“上一次的比赛是应为我在半路睡着了，所以不公平，我还要和你比一次。”乌龟笑了笑说：“好啊，什么时候？在那里？”兔子骄傲的说：“就明天，在山顶上比。” 第二天，他们请老虎来做裁判，森林里的小动物们都来看热闹，这一次的龟兔大赛是从山上往山下跑。 只听见枪声一响，兔子和乌龟都跑了起来，大部分的小动物都是给乌龟加油，乌龟使劲的往前爬，可兔子已领先一大段了。兔子快到达终点了，他回头望了望乌龟还在起点那乌龟急了，不小心失足，摔了下来，最后超过了终点，得了第一，而兔子，却满脸通红，不敢回家！

The Rabbit And The Tortoise
In the animals sports game,a rabbit and a tortoise both joined a long-distance race.Every other animal thought of course the winner would be the rabbit,the rabbit thought so too.When the race just began,the rabbit ran fast like a flying arrow,without minutes,disappeared in distance.However,the tortoise seemed not to move much.When the rabbit looked back and saw nothing,he thought the tortoise would never catch up in any case,why not sleep for a while?He did so.While the rabbit was sleeping the tortoise didn't relax any more,he move little by little,at last won the race actually.

一天,兔子嘲笑乌龟的脚短和速度很慢.乌龟回答说：你可能跑得和风一样快 ,但我会在一场比赛中打败你 !兔子认为这种想法是不可能 ,就同意这项建议.因此双方要狐狸决定路程和终点.在这场比赛,乌龟和兔子一起起跑.乌龟不停缓慢但稳步的走,当路程快要结束.兔子跑得很快 ,停下来躺下休息.但兔子不小心睡了.最终,他一觉醒来,快步跑去终点.但他到达终点时看见乌龟已经在那里,在兔子舒适睡眠时乌龟努力的爬过了终点.
( 由於中英文文法问题 ,我加了一些字令文章看起来不会怪怪的 )

运动本身是一个矛盾,内在包含着连续性和间断性的对立统一.对于具体的某一瞬间,乌龟或兔子都是在某一个具体的点A、B上,这是运动的间断性.对于只看到运动的间断性的人来说,乌龟永远都在兔子的前面,兔子永远也追不上乌龟.
但是运动同时也具有连续性.运动着的物质以时空作为自己的存在方式.什么是时空呢?时间是运动过程的持续性和顺序性；空间是运动过程的伸张性和广延性.这些都反映了运动过程的连续性.正因为运动是连续的,所以兔子可以追上乌龟.

这是乌龟和兔子的首次比赛.乌龟在赛前加紧训练,做好了充足的准备;兔子则不以为然,根本不把对手放在眼里.比赛开始了,兔子向前跑着,不时回头张望,眼见乌龟还在慢腾腾地爬着,心想:"冠军肯定是我的,先休息一会儿也无妨."于是在路边的一棵树下倒头睡了.最终的结果想必大家非常熟悉,乌龟坚持到底赢得了胜利.
This is the first time the tortoise and the rabbit competition.Turtle before the game to step up training,well prepared; rabbit is not,simply do not pay attention to opponents.Race started,the rabbit ran forward,looked back from time to time ,also saw a turtle slowly crawling on all fours,thinking:"title is definitely my first no harm to rest a while." So in the end,the roadside tree went to sleep.The end result must be very familiar with the turtle persist in the end won the victory

自从兔子在长跑比赛中输给乌龟后，就下定决心要把自己训练得更加强大，而且，他还非常努力地克服自己骄傲的缺点，让自己变得更加完美无缺。而乌龟也深知自己不是兔子的对手，于是，他拜“飞人”刘翔为师，让他把自己...

①将一只蚂蚁放在透明塑料管的一端，然后封住此端口，迫使蚂蚁甲从另一端口出去．
②从蚂蚁移动开始计时，直至蚂蚁爬出另一端口停表．通过观察得从塑料管一端爬出塑料管另一端，蚂蚁用时19秒．
③测得塑料管长度为0.18米．
④v=
s
t =
0.18m
19s =0.0095m/s．

1500/20=75
1500-600=900
900/240=3.75
75-3.75=71.25分钟

乌龟到达终点需要：4.5÷5×60=0.9×60=54（分钟）
如兔子不断地跑到达终点需要：4.5÷25×60=0.18×60=10.8（分钟）
兔子实际到达终点需要：1+15+2+15+3+15+4+15+0.8=70.8（分钟）
乌龟比兔子到达终点快：70.8-54=16.8（分钟）
答：乌龟比兔子快多16.8分钟达到终点.

乌龟爬完全程需要的时间：2000÷25=80分钟
乌龟爬完全程时,兔子跑了：2000-400=1600米,
如果兔子一直跑的话,需要时间：1600÷320=5分钟
所以它睡了80-5=75分钟