A hare (兔子) runs _____ than a tortoise (

ll抗体2022-10-04 11:39:541条回答

A hare (兔子) runs _____ than a tortoise (乌龟).
[ ]
A. fast
B. faster
C. slow
D. slower

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hbhzzh 共回答了18个问题 | 采纳率88.9%
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兔子数列
leonmax1年前1
vivian-sj 共回答了18个问题 | 采纳率94.4%
即斐波那契数列,“斐波那契数列”的发明者,是意大利数学家列昂纳多·斐波那契(LeonardoFibonacci,生于公元1170年,卒于1240年.籍贯大概是比萨).他被人称作“比萨的列昂纳多”.
  斐波那契数列指的是这样一个数列:0,1,1,2,3,5,8,13,21……
这个数列从第三项开始,每一项都等于前两项之和.它的通项公式为:
(1/√5)*{[(1+√5)/2]^n - [(1-√5)/2]^n}【√5表示根号5】
  很有趣的是:这样一个完全是自然数的数列,通项公式居然是用无理数来表达的.
【该数列有很多奇妙的属性】
  比如:随着数列项数的增加,前一项与后一项之比越逼近黄金分割0.6180339887……
  还有一项性质,从第二项开始,每个奇数项的平方都比前后两项之积多1,每个偶数项的平方都比前后两项之积少1.
  如果你看到有这样一个题目:某人把一个8*8的方格切成四块,拼成一个5*13的长方形,故作惊讶地问你:为什么64=65?其实就是利用了斐波那契数列的这个性质:5、8、13正是数列中相邻的三项,事实上前后两块的面积确实差1,只不过后面那个图中有一条细长的狭缝,一般人不容易注意到.
  如果任意挑两个数为起始,比如5、-2.4,然后两项两项地相加下去,形成5、-2.4、2.6、0.2、2.8、3、5.8、8.8、14.6……等,你将发现随着数列的发展,前后两项之比也越来越逼近黄金分割,且某一项的平方与前后两项之积的差值也交替相差某个值.
  斐波那契数列的第n项同时也代表了集合{1,2,...,n}中所有不包含相邻正整数的子集个数.
【斐波那契数列别名】
  斐波那契数列又因数学家列昂纳多·斐波那契以兔子繁殖为例子而引入,故又称为“兔子数列”.
  斐波那契数列
  一般而言,兔子在出生两个月后,就有繁殖能力,一对兔子每个月能生出一对小兔子来.如果所有兔都不死,那么一年以后可以繁殖多少对兔子?
  我们不妨拿新出生的一对小兔子分析一下:
  第一个月小兔子没有繁殖能力,所以还是一对;
  两个月后,生下一对小兔民数共有两对;
  三个月以后,老兔子又生下一对,因为小兔子还没有繁殖能力,所以一共是三对;
  ------
  依次类推可以列出下表:
  经过月数:0 1 2 34 5 6 7 8 9 10 11 12
  兔子对数:1 1 2 35 8 13 21 34 55 89 144 233
  表中数字0,1,1,2,3,5,8---构成了一个数列.这个数列有关十分明显的特点,那是:前面相邻两项之和,构成了后一项.
  这个数列是意大利中世纪数学家斐波那契在<算盘全书>中提出的,这个级数的通项公式,除了具有a(n+2)=an+a(n+1)/的性质外,还可以证明通项公式为:an=1/√[(1+√5/2)n-(1-√5/2) n](n=1,2,3.)
【斐波那挈数列通项公式的推导】
  斐波那契数列:0,1,1,2,3,5,8,13,21……
  如果设F(n)为该数列的第n项(n∈N+).那么这句话可以写成如下形式:
  F(1)=F(2)=1,F(n)=F(n-1)+F(n-2)(n≥3)
  显然这是一个线性递推数列.
  通项公式的推导方法一:利用特征方程
  线性递推数列的特征方程为:
  X^2=X+1
  解得
  X1=(1+√5)/2,X2=(1-√5)/2.
  则F(n)=C1*X1^n +C2*X2^n
  ∵F(1)=F(2)=1
  ∴C1*X1 + C2*X2
  C1*X1^2 + C2*X2^2
  解得C1=1/√5,C2=-1/√5
  ∴F(n)=(1/√5)*{[(1+√5)/2]^n -[(1-√5)/2]^n}【√5表示根号5】
  通项公式的推导方法二:普通方法
  设常数r,s
  使得F(n)-r*F(n-1)=s*[F(n-1)-r*F(n-2)]
  则r+s=1, -rs=1
  n≥3时,有
  F(n)-r*F(n-1)=s*[F(n-1)-r*F(n-2)]
  F(n-1)-r*F(n-2)=s*[F(n-2)-r*F(n-3)]
  F(n-2)-r*F(n-3)=s*[F(n-3)-r*F(n-4)]
  ……
  F(3)-r*F(2)=s*[F(2)-r*F(1)]
  将以上n-2个式子相乘,得:
  F(n)-r*F(n-1)=[s^(n-2)]*[F(2)-r*F(1)]
  ∵s=1-r,F(1)=F(2)=1
  上式可化简得:
  F(n)=s^(n-1)+r*F(n-1)
  那么:
  F(n)=s^(n-1)+r*F(n-1)
  = s^(n-1) +r*s^(n-2) + r^2*F(n-2)
  = s^(n-1) +r*s^(n-2) + r^2*s^(n-3) + r^3*F(n-3)
  ……
  = s^(n-1) +r*s^(n-2) + r^2*s^(n-3) +……+ r^(n-2)*s + r^(n-1)*F(1)
  = s^(n-1) +r*s^(n-2) + r^2*s^(n-3) +……+ r^(n-2)*s + r^(n-1)
  (这是一个以s^(n-1)为首项、以r^(n-1)为末项、r/s为公差的等比数列的各项的和)
  =[s^(n-1)-r^(n-1)*r/s]/(1-r/s)
  =(s^n - r^n)/(s-r)
  r+s=1, -rs=1的一解为s=(1+√5)/2, r=(1-√5)/2
  则F(n)=(1/√5)*{[(1+√5)/2]^n- [(1-√5)/2]^n}
  
  斐波那契数列(f(n),f(0)=0,f(1)=1,f(2)=1,f(3)=2……)的其他性质:
  1.f(0)+f(1)+f(2)+…+f(n)=f(n+2)-1
  2.f(1)+f(3)+f(5)+…+f(2n-1)=f(2n)-1
  3.f(0)+f(2)+f(4)+…+f(2n)=f(2n+1)-1
  4.[f(0)]^2+[f(1)]^2+…+[f(n)]^2=f(n)·f(n+1)
  5.f(0)-f(1)+f(2)-…+(-1)^n·f(n)=(-1)^n·[f(n+1)-f(n)]+1
  6.f(m+n)=f(m-1)·f(n-1)+f(m)·f(n)
  7.[f(n)]^2=(-1)^(n-1)+f(n-1)·f(n+1)
  8.f(2n-1)=[f(n)]^2-[f(n-2)]^2
  在杨辉三角中隐藏着斐波那契数列
  1
  1 1
  1 2 1
  1 3 3 1
  1 4 6 4 1
  ……
  过第一行的“1”向左下方做45度斜线,之后做直线的平行线,将每条直线所过的数加起来,即得一数列1、1、2、3、5、8……
  
(1)细察下列各种花,它们的花瓣的数目具有斐波那契数:延龄草、野玫瑰、南美血根草、大波斯菊、金凤花、耧斗菜、百合花、蝴蝶花.
  (2)细察以下花的类似花瓣部分,它们也具有斐波那契数:紫宛、大波斯菊、雏菊.
  斐波那契数经常与花瓣的数目相结合:
  3………………………百合和蝴蝶花
  5………………………蓝花耧斗菜、金凤花、飞燕草
  8………………………翠雀花
  13………………………金盏草
  21………………………紫宛
34,55,84……………雏菊、
(3)斐波那契数还可以在植物的叶、枝、茎等排列中发现.
例如,在树木的枝干上选一片叶子,记其为数0,然后依序点数叶子(假定没有折损),直到到达与那息叶子正对的位置,则其间的叶子数多半是斐波那契数.叶子从一个位置到达下一个正对的位置称为一个循回.叶子在一个循回中旋转的圈数也是斐波那契数.在一个循回中叶子数与叶子旋转圈数的比称为叶序(源自希腊词,意即叶子的排列)比.多数的叶序比呈现为斐波那契数的比.
  (4)斐波那契数列与黄金比值
  相继的斐波那契数的比的数列:
  它们交错地或大于或小于黄金比的值.该数列的极限为.这种联系暗示了无论(尤其在自然现象中)在哪里出现黄金比、黄金矩形或等角螺线,那里也就会出现斐波那契数,反之亦然.
  可它的每一项却都是整数.而且这个数列中相邻两项的比值,越靠后其值越接近0.618.这个数列有广泛的应用,如树的年分枝数目就遵循斐波那契数列的规律;而且计算机科学的发展,为斐波那契数列提供了新的应用场所.
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英语填空英语英语英语根据中文提示,完成下列句子.1.兔子正在快跑.The rabbit __________ _____
英语填空
英语
英语
英语
根据中文提示,完成下列句子.
1.兔子正在快跑.
the rabbit __________ __________ fast.
2.祝你旅行愉快!
__________ a __________ trip!
3.我很抱歉不能参加这个告别晚会.
i'm __________ that i will not be __________to__________to the farewell party.
4.我将在这个周末举行生日晚会.
i __________ __________ __________ have a birthday party this __________.
5.虽然乌龟很小跑得又慢,但是他赢了!
mr tortoise __________ the game although he's __________ and __________.
6.你是怎样用微波炉的?
__________ do you __________ a microwave?
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I was telling my boy Sonny the story of the hare (兔子)
I was telling my boy Sonny the story of the hare (兔子) and the tortoise (乌龟). At the end I said. “Son, remember: Slow and steady (稳固的) wins the race. Don’t you think there’s something to learn from the tortoise?”
Sonny opened his eyes wide, “Do you mean next time when I’m participating in the 60-metre race I should wish that Billy and Tony and Sandy would all fall asleep halfway?”
I was shocked, “But the tortoise didn’t wish that the hare would fall asleep on the way!”
“He must have wished that,” Sonny said. “Otherwise how could he be so stupid as to race with the hare? He knew very well the hare ran a hundred times faster than he himself did.”
“He didn’t have such a wish,” I insisted, “He won the race by perseverance , by pushing on steadily.”
Sonny thought a while. “That’s a lie,” he said. “He won it because he was lucky. If the hare hadn’t happened to fall asleep, the tortoise would never have won the race. He could be as steady as you like, or a hundred times steadier, but he’d never have won the race. That’s for sure.”
I gave up. Today’s children are not like what we used to be. They’re just hopeless.
61.Sonny believed that the tortoise ________.
won the race by his own effort
B. took a risk by agreeing to race
C. was not given a fair chance in the race
D. in fact did not win the race
62.Billy, Tony and Sandy must be ________.
A. boys who were unknown to Sonny’s father
B. boys Sonny had run races with before
C. boys Sonny had never raced with before
D. boys Sonny did not expect to race with again
63.The writer thinks that his generation (代) ________.
A. were more clever than Sonny’s generation
B. had the same ideas about life as Sonny’s generation
C. were more hopeful than Sonny’s generation
D. had different ideas about life from Sonny’s generation
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英语翻译I was telling my boy Sonny the story of the hare (兔子) an
英语翻译
I was telling my boy Sonny the story of the hare (兔子) and the tortoise (乌龟).At the end I said,“ Son,remember:Be slow and steady (镇定的),and that will win the race.Don’t you think there’s something to learn from the tortoise?”
Sonny opened his eyes wide,“Do you mean next time when I’m entering for the 60-metre race I should wish that Billy,Tony and Sandy would all fall asleep halfway?”
I was shocked,“But the tortoise didn’t wish that the hare would fall asleep!”
“He must have wished that,” Sonny said,“Otherwise how could he be so foolish as to race with the hare?He knew very well the hare ran a hundred times faster than he himself did.”
“He didn’t have such a wish,” I insisted.“He won the race by perseverance (坚忍不拔的),by pushing on steadily.”
Sonny thought a while.“That’s a lie,” he said.“He won it because he was lucky.If the hare hadn’t happened to fall asleep,the tortoise would never have won the race.He could be as steady as you like,or a hundred times steadier,but he’d never have won the race.That’s for sure.”
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我给我的儿子Sonny说兔子和乌龟的故事.末了,我说:“儿子,记住,要慢慢来,保持镇定,这会使你赢得比赛.难道你不觉得我们可以从乌龟身上学到一些东西吗?”
Sonny把他的眼睛睁得很大:“你的意思是,在我即将参加的60米赛跑中,我要期望Billy,Tony还有Sandy在半途睡着吗?”
我被震到了:“但是故事里的乌龟并没有期望兔子会睡着啊!”
“他肯定曾经期望过,”Sonny说,“否则他怎么会这么笨来和兔子赛跑呢?他十分了解兔子跑得比他快一百倍.”
“他确实没有这样一个期望.”我坚持道,“他是以毅力和平稳的前进而获得比赛的胜利的.”
Sonny想了一会儿.“这是一个谎言,”他说,“他赢了是因为他幸运.如果兔子没有碰巧睡着的话,乌龟不可能赢得比赛.他能做到像你说的那样平稳,或许还可以比这平稳一百倍,但他绝对不会赢得比赛.这是一定的.”
英语作文兔子
且醉且吟1年前1
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My Rabbit
Last year,my father bought me a rabbit as my birthday present,I feel so happy,because I want to raise a pet for a long time.I named my rabbit Lucy,Lucy
is very quiet,she likes to eat carrot,I give her small piece of carrot twice a day,she eats little.I take care of her carefully,Lucy is my best friend
now,sometimes I will say my secret to her.
I was telling my boy Sonny the story of the hare (兔子) and th
I was telling my boy Sonny the story of the hare (兔子) and the tortoise (乌龟). At the end I said, “ Son, remember: Be slow and steady (镇定的), and that will win the race. Don’t you think there’s something to learn from the tortoise?”
Sonny opened his eyes wide, “Do you mean next time when I’m entering for the 60-metre race I should wish that Billy, Tony and Sandy would all fall asleep halfway?”
I was shocked, “But the tortoise didn’t wish that the hare would fall asleep!”
“He must have wished that,” Sonny said, “Otherwise how could he be so foolish as to race with the hare? He knew very well the hare ran a hundred times faster than he himself did.”
“He didn’t have such a wish,” I insisted. “He won the race by perseverance (坚忍不拔的), by pushing on steadily.”
Sonny thought a while. “That’s a lie,” he said. “He won it because he was lucky. If the hare hadn’t happened to fall asleep, the tortoise would never have won the race. He could be as steady as you like, or a hundred times steadier, but he’d never have won the race. That’s for sure.”
I gave up. Today’s children are not like what we used to be. They’re just hopeless.
小题1:The writer argued (辩论)with his son because ______________.
A.he liked tortoises while his son liked hares
B.they disagreed about whether the tortoise was foolish
C.he tried to teach his son a moral (品德) lesson but the son had totally different opinion
D.he liked the story of the hare and the tortoise while his son didn’t.
小题2:Sonny believed that the tortoise ______________.
A.won the race by his own hard working
B.took a risk (冒险) by agreeing to run a race
C.was not given a fair chance in the race
D.in fact did win the race luckily
小题3:Billy, Tony and Sandy must be_______________.
A.boys who were unknown to Sonny’s father
B.boys who Sonny has run races with before
C.boys who Sonny has never raced with before
D.boys who Sonny did not expect to race with again
小题4:The writer thinks that his generation (一代人) ______________.
A.are cleverer than Sonny’s generation
B.have the same ideas about life as Sonny’s generation
C.are more hopeful than Sonny’s generation
D.have different ideas about life from Sonny’s generation
小题5:According to the passage, who do you think learnt a lesson?
A.The tortoise B.Sonny
C.The hare D.Sonny’s father
第五天堂1年前1
badansel 共回答了18个问题 | 采纳率83.3%
小题1:C
小题2:D
小题3:B
小题4:D
小题5:D