第一篇:三年級英語 閱讀理解天天練 美國孩子學中文(含解析)
美國孩子學中文
同學們現在都在努力學英文,大家知道嗎?就在你們認真背ABC的同時,大洋彼岸的小伙伴們也在努力學習中文呢?本文適合小學三年級學生閱讀練習。
You work hard to learn English.Do you know American kids are learning Chinese? In many US schools, students take Chinese lessons.How do they learn Chinese? Let’s go to the Muir Elementary School in the US.Maddi, 6, and Stephen, 6, are first graders in this school.They are learning how to say “we” in Chinese.“It’s not easy to remember the Chinese characters(漢字).But learning Chinese is fun,” they say.In Chinese class, they are learning the language through songs, games and lots of talking.“Chinese is popular among US kids.They pick it up really fast,” their teacher says.【小練習】判斷下面句子正確與否,正確的寫“T”,錯誤的寫“F”。
1.()We work hard to learn English and the US kids work hard to learn Chinese.2.()Students in US schools never learn Chinese lessons.3.()In the Muir Elementary School in the US, Maddi and Stephen are learning how to say “we” in Chinese.4.()To US kids, it's not easy to remember the Chinese characters.5.()In Chinese class, US kids are learning the language through songs, games and lots of listening.【解析】
1.T.從文章第一段可以知道“中國孩子努力學英語的同時,美國孩子們也在學中文呢。”,所以這題是正確的。
2.F.從文章第一段第三句In many US schools, students take Chinese lessons.“在許多美國學校,孩子們會上中文課。”可以知道題目中說“他們從不上中文課”肯定是不對的啦。注意這里never是“從來不”的意思噢。
3.T.從文章第二段可以知道在美國的Muir小學,Maddi和Stephen正在學習怎么用中文說“我們”,所以這題是正確的。
4.T.從文章第二段后半部分可以知道“對于這些美國孩子來說,學習漢字可不簡單噢!”,所以這題也是正確噠~
5.F.從文章最后一段第一句In Chinese class, they are learning the language through songs, games and lots of talking.“在美國的中文課上,當地孩子們通過歌曲,游戲和談話的方式來學習中文。”可是題目中把“談話”變成了“聽力”,所以很可惜,這題是不正確噠!
第二篇:三年級英語 閱讀理解天天練《熊貓總動員》(含解析)
《熊貓總動員》
Pandy是只可愛的小熊貓,他是個男孩噢!Pandy和他的家人、朋友們快樂地生活在森林里。每天大家一起玩耍、一起成長,可是突然有一天?快來看故事并完成小練習吧。本文適合小學三年級學生閱讀練習。Pandy is a lovely panda.He lives happily with his family and friends in the forest.One day, some terrible enemies(敵人)come.The pandas are in danger(處在危險中).Pandy wants to save his friends and family, but he doesn’t know kungfu.How will he fight the enemies?
You can watch the 3D cartoon movie, Little Big Panda(《熊貓總動員》)and find the answer.China and Europe made this film together.【練習1】判斷下面句子正確與否,正確的寫“T”,錯誤的寫“F”。
1.()Little Big Panda is a film.It's Chinese name is “熊貓總動員”.2.()The film is made by the United States.3.()Pandy is the name of a lovely boy panda and he lives happily in the forest.【解析】
1.T.從文章最后一段You can watch the 3D cartoon movie, Little Big Panda(《熊貓總動員》)and find the answer.可以知道這的確是部電影,而且如果同學們平時關系電影的話,應該也會略有耳聞吧!
2.F.從文章最后一句China and Europe made this film together.可以知道這部電影是“中國和歐洲聯合打造”噠!所以不是美國打造的噢!
3.T.從文章前兩句Pandy is a lovely panda.He lives happily with his family and friends in the forest.“Pandy是只可愛的熊貓。他和家人、朋友們快樂地住在森林里。”可以知道Pandy是個男熊貓寶寶噢,因為文中用了he嘛,而且他確實快樂地生活在森林里呢!
第三篇:高一英語天天練
洪翔中學2013~2014學年高一英語午練試卷(七)
滿分60時間50分鐘使用時間:2013.12.12
I.Multiple choice(1×15=15分)
1.As far as I see, ___ is no possibility ___ he will win the tennis match.A.it;thatB.there;thatC.it;whetherD.there;whether
2.In the factory women ___44% of the workforce(勞動力), and nearly half the mothers with children are in paid work.A.make upB.set upC.build upD.take up
3.— Was there lots of fun at yesterday’s party?
— Yes.We all enjoyed ourselves.You ___ have come, but why didn’t you come?
A.mustB.shouldC.mightD.need
4.My friend persuaded me to take an umbrella with me on the holidays ______rain.A.in case ofB.in want ofC.as a result ofD.in spite of
5.I’d like to arrive 20 minutes early ____ I can have time for a cup of tea.A.as soon asB.as a resultC.in caseD.so that
6.Every possible means ____ to prevent the air pollution, but the sky is still not clear.A.is usedB.are usedC.has been usedD.have been used
7.——I bought ___ eggs, Mom.——Did you? There are still ___ eggs in the fridge!
A.two dozens;dozens ofB.two dozen;dozens of
C.two dozen;dozen ofD.two dozens;dozen of
8.In front of the temple ___ two tall trees, which ___ said to de over eight hundred years old.A.are;areB.is;isC.are;isD.is;are
9.Mr.Smith is so busy ______ his office work that he spends little time ______ after
his children.A.in;lookingB.with;to lookC.with;lookingD.in;to look
10.I’ll tell you ______ I see in my new neighborhood the moment I settle down there.A.whateverB.wheneverC.HoweverD.wherever
11.Enough sleep can make us ________ energy and make it possible for us to perform well in the exam.A.filled ofB.full ofC.fill withD.full with
12.The country life he was used to _____ greatly since 1992.A.changeB.has changedC.changingD.have changed
13.What’s the way you think of ____ your handwriting?
A.to improveB.improvingC.how to improveD.for you improve
14.Give them a hand this time and I am sure they will offer theirs______ in the future.A.by turnsB.in turnC.at turnD.in return
15.We insisted that he ______ badly ill and that he _____ to hospital at once.A.was;was sentB.was;be sent
C.should be;should be sentD.be;was sent
II.Cloze(1×20=20分)
As soon as I learned to say the word “beauty”, I set out to look for it.Before I
could find it, I asked my mother what a beauty was like.She said that a beauty iswho has large bright eyes and fine skin.When I was in Grade Four, I such a girl.I sat right in front of her andher to see if she was a real beauty.She a beauty in my eyes until the day sheher pencil box which I knocked on to the floor.I Suddenly she flew at me and threw me onto the ground and we rolled abouteach other.During the years that followed, I came acrossexplanations given to me by different people.Some said a girl with a thin figure(體形)is a beauty, that a girl with a gentle voice is beautiful, said it is a girl with hair that is like a waterfall.I give these a second thought.I searched for a beauty had told me before, but it was useless.Then I met an old man.He told me that a beauty is a girl who might not be quitewith natural beauty.However, she becomes a beautyexperiencing hardship.After a 10-year hunt for a beauty, I found her.She became my family and had to take care of herself from young.When we married, I really got the idea about a beauty.She was the one the16.A.your classmateB.a girlC.an experienced girlD.an ugly girl
17.A.likedB.was tired ofC.was againstD.found
18.A.stared atB.scoldedC.beatD.laughed at
19.A wasn’tB.pretended to beC.treated himselfD.was
20.A.quarreledB.talkedC.playedD.studied
21.A.stealB.rob her ofC.likeD.pick up
22.A.by chanceB.by no meansC.by herselfD.by the way
23.A.agreedB.refusedC.was happyD.did so
24.A.talking withB.helpingC.hittingD.leaving
25.A.the sameB.differentC.the oppositeD.some correct
26.A.butB.orC.asD.so
27.A.EveryoneB.The othersC.NobodyD.Others
28.A.didB.mustC.didn’tD.should
29.A.an old manB.some peopleC.nobodyD.my mother
30.A.luckyB.sadC.willingD.happy
31.A.afterB.withoutC.likingD.against
32.A.friendB.teacherC.classmateD.girlfriend
33.A.uglyB.beautifulC.lovelyD.bright
34.A.richB.farmer’sC.happyD.poor
35.A.foolishB.kind-heartedC.wiseD.honest III.Reading Comprehension(2×8=16分)
A
Letter to Editor of TV Weekly
Dear Sir/Madam,I read Alison Burnham’s review of When we were 12, and I do not agree with her.I thought the programme was wonderful — I found the old news pictures really interesting — they helped to bring to life the stories the people were telling.The programme reminds me of many things from my own childhood.For example, one day when I was about five, I was going to school on the bus by myself(this was the late 1960s).My mother had given me exactly the right money for a return ticket.I held out my hand with the money in it — one big coin on top of one little coin.The bus conductor took the big top coin only and she gave me a ticket, but it was a pink one for a single journey.I needed a white one for a return journey, but I was too frightened to say anything.When school finished for the day, I couldn’t catch the bus home — I had to walk.As a grown-up, whenever I’ve been in a situation where I need to say something or take some action, this early memory of my bus ride comes back to me, and I’m able to take control of the situation.I would like to say to the director, Bret Chrysler, carry on making this kind of programme.Too much TV these days is quiz shows and so called “reality programmes”.I appreciate the human story that can make me laugh and cry.Yours faithfully,Chris Daniels
36.What is Chris Daniels’ purpose of writing this letter?
A.To persuade Bret Chrysler to turn away from quiz shows.B.To entertain other readers with old news pictures.C.To express his appreciation of the programme.D.To have his story told on the programme.A.describe how painful his early experience was
B.draw a direct response from Alison Burnham
C.show how the programme made him think
D.teach the readers of TV Weekly a lesson
A.he hadn’t got a return ticketB.he had lost his bus ticket
C.he didn’t like big crowdsD.he missed the bus home
39.What does Chris Daniels now think about his experience on the bus?
A.He should have told the conductor then.B.He should have been well treated.C.He regrets going to school alone.D.He wishes it hadn’t happened.B
Several interesting American museums tell about health subjects.One is the Doctor Samuel D.Harris National Museum of Dentistry.It is at the University of Maryland in Baltimore.That is where the first college in the world to train dentists began.The museum tells about the history of the medical treatment of teeth.Visitors 受感染的)teeth.They also can see sets of teeth made of animal bone.They were made for a
famous American--the first President, George Washington.Most people do not consider a visit to the dentist their idea of a good time.However, the director of the museum says he wanted to make the museum a fun place to visit.He says he also wants to teach visitors about the importance of taking care of their teeth.Hearing Aid Museum is at Kent State University in Kent, Ohio.The museum has more than three-thousand hearing aids from around the world.They include old and strange devices.Some hearing aids were made to look like other objects.That is because in the past many people did not want anyone to know they were wearing a hearing aid.40.It is common for people to think it uneasy to pay a visit to ____.A.the University of MarylandB.the Museum of Dentistry
C.the Hearing Aid MuseumD.the dentist
41.The text mainly tells about _____.A.museums in the US
B.interesting American museums
C.American museums with health subjects
D.the history of the medical treatment of teeth
42.What do we learn about George Washington from the text?
A.He once visited the National Museum of Dentistry.B.He considered the Museum of Dentistry a fun place to visit
C.His artificial teeth were collected in the National Museum of Dentistry.D.His teeth seemed to be made of animal bone.43.The underlined word “devices” in the first and last paragraph probably means _____.A.meansB.strategiesC.toolsD.desires
Ⅳ.Complete sentences according to the initials or Chinese.(1.5×6=9分)
44.The boy watched the plane until it ____________(消失)from view.45.The local newspaper made ________________(安排)for an interview with Professor Li.46.I didn’t see your car, so I _____________(認為)you’d gone out.47.The spokesman said that many strange customs had _________(存在)from earlier times.48.There is no a_______________ words to express my thanks to my parents.49.Lynne, a friendly person with a great sense of h__________, can make the whole audience laugh.
第四篇:二年級英語 閱讀理解天天練 小屁孩日記(含解析)
小屁孩日記
小屁孩日記
Greg Heffley is an 11-year-old boy.He is kind, honest, smart and naughty.He has a lot of ideas.He has a diary.In his diary, he writes many interesting stories about his life.He also draws cartoons in his diary.He has a lot of problems in school.But he makes a lot of trouble, too.He runs away from a school singing contest(比賽).He often wants to play tricks(捉弄)on others.But he always makes a fool of himself(出洋相).He is not good at making friends.But he wants to be the most popular in his school.Greg is not a good role model(榜樣).But US children like reading his diaries.In fact(實際上), everything Greg does, you should do the opposite(相反).Do you want to read about him?Go and read the book, Diary of a Wimpy Kid(《小屁孩日記》).It won the Favorite Book award(獎項)at the 2010 Kids’ Choice Awards in the US.【小練習】判斷下面句子正確與否,正確的寫“T”,錯誤的寫“F”。
1.()Greg Heffley is an 11-year-old boy.2.()Greg Heffley has no idea,but he has a diary.3.()In his diary, he writes many interesting stories about his life.4.()He runs away from a school dancing contest(比賽).5.()Greg is not a good role model(榜樣).【解析】
1.T.從文章第一句Greg Heffley is an 11-year-old boy.可以知道這句話是正確的。
2.F.從文章第三、第四句He has a lot of ideas.He has a diary.“Greg有很多鬼點子。他還有本日記。”可以知道題目中說“他沒有鬼點子”是不對的啦。
3.T.從文章第五句In his diary, he writes many interesting stories about his life.“在日記里,他寫了好多生活中有趣兒的故事。”可以知道這題是正確的。
4.F.從文章第九句He runs away from a school singing contest(比賽).“他從學校唱歌比賽中逃出來了。”可以知道題目中說的“舞蹈比賽”是錯誤的啦。
5.T.從文章第二段第一句Greg is not a good role model(榜樣).“Greg可不是個好榜樣。”可以知道這題是正確滴。想想也是啊,他老是搗亂、出狀況,我們可不能學習他噢!
第五篇:三年級奧數天天練
三年級奧數天天練
1、小華在計算一道題時,把一個數加上4乘2看作了乘2加上4,得數為40。正確的得數是多少?
2、小紅在計算有余數除法時,把被除數113錯寫成131,這樣商比原來多2,但余數恰好相同。正確的除數和余數是多少?
3、小華、小林、小黃三人期末考試數學成績總和為289分,已知小華比小林多8分。小林比小黃少8分,三個人各得多少分?
【答案】可以知道小華和小黃的分數相同,均比小林多8分,因此小華和小黃的分數為(289+8)÷3=99(分),所以小華的人數為91分。
4、兩個數的和是2016,其中一個加數的個位是0,如果把這個0去掉,就正好等于另一個加數的兩倍。這兩個加數各是多少?
【答案】因為把第一個加數個位上的“0”去掉,得到了第二個加數的2倍,所以,第一個加數是第二個加數的20倍.把第二個加數看作“1倍數”,第二個加數就是“20倍數”,這兩個數的和2016就是“1+20”倍的數.根據這個“量”與“倍”的對應關系,可先求出第二個加數.這兩個加數分別是: 2010÷(1+20)=96,2016-96=1920 5、6、10、14、18、??最后一項是86,問數列共有幾項? 【答案】這是一個以6為首項,4為公差的等差數列,根據公式,86=6+(n-1)×4,所以n=21,即這個數列共有21項。6、100與500之間能被9整除的所有自然數之和? 【答案】第一個能被9整出的數是108,最后一個是495,共(495-108)÷9+1=44項,所以100與500之間能被9整除的所有自然數之和為。
7、今年小玲8歲,她父親36歲,當兩人年齡和是62歲時,兩人年齡各多少歲? 【答案】在年齡問題中必須記住兩人的年齡差不變這個解題關鍵。題中沒有給出小玲和父親的年齡之差,但是已知兩人今年的年齡,那么兩人的年齡差是34-6=28(歲),不論再過多少年,兩人的年齡差是保持不變的,所以當兩人年齡和為58歲時,他們的年齡差仍是28歲,根據和差問題就可解此題。
父親的年齡:[62+(36-8)]÷2=〔62+28〕÷2=90÷2=45(歲)
小玲的年齡:62-45=17(歲)
答:當兩人年齡和為62歲時,父親的年齡是45歲,小玲的年齡是17歲。
小結:解這類題的關鍵是理解兩人的年齡差是固定不變的,即兩人的年齡是同時增長的。
8、小華今年12歲,他媽媽今年48歲,多少年以前媽媽的年齡是小華的5倍? 【答案】小華和他媽媽年齡的差都是不變的,媽媽的年齡比小華大48-12=36歲,根據差倍公小華當時的年齡為36÷(5-1)=9歲,所以是12-9=3年前。
9、雞兔同籠,頭共46,足共128,雞兔各幾只?
【答案】假設法,運用公式雞數=(每只兔腳數×總頭數-總腳數)÷(每只兔腳數-每只雞腳數)、兔數=總頭數-雞數。
所以,雞數=(4×6-128)÷(4-2)=(184-128)÷2=56÷2=28(只)
兔數=46-28=18(只)。
10、雞與兔共有100只,雞的腳比兔的腳多80只,問雞和兔各多少只?
【答案】假設100只全是雞,那么腳的總數是200只,這時兔腳是0只,雞腳比兔腳多200只,二實際上雞腳比兔腳多80只,因此,雞腳與兔腳的差比實際多了200-80=120(只),這是因為把其中的兔換成了雞,每把一只兔換成雞,雞腳就增加2只,兔腳就減少4只,雞腳與兔腳的差數增加2+4=6(只),所以換成雞的兔子有120÷6=20(只),有雞100-20=80(只)。
11、馬路的一邊每相隔9米栽有一棵柳樹。張軍乘汽車5分鐘共看到501棵樹.問汽車每小時走多少千米?
【答案】張軍5分鐘看到501棵樹意味著在馬路的兩端都植樹了;只要求出這段路的長度就容易求出汽車速度。
5分鐘汽車共走了:9×(501-1)=4500(米),汽車每分鐘走:4500÷5=900(米),汽車每小時走:900×60=54000(米)=54(千米)
列綜合式:9×(501-1)÷5×60÷1000=54(千米)
答:汽車每小時行54千米。
12、某人要到一座高層樓的第8層辦事,不巧停電,電梯停開,如從1層走到4層需要48秒,請問以同樣的速度走到八層,還需要多少秒?
【答案】要求還需要多少秒才能到達,必須先求出上一層樓梯需要幾秒,還要知道從4樓走到8樓共走幾層樓梯。上一層樓梯需要:48÷(4-1)=16(秒),從4樓走到8樓共走8-4=4(層)樓梯。到這里問題就可以解決了。
上一層樓梯需要:48÷(4-1)=16(秒)
從4樓走到8樓共走:8-4=4(層)樓梯
還需要的時間:16×4=64(秒)
答:還需要64秒才能到達8層。
13、如果a△b=(a-2)×b,例如3△4=(3-2)×4=4,當a△5=30時,那么a是多少呢?
14、對于數a、b、c、d規定<a,b,c,d>=2ab-c+d,如果<1,3,5,x>=7,那么x是多少?
15、有同樣大小的紅白黑珠共96個,按先5個紅的,再4個白的,再3個黑的排列著,如圖:◎ ◎ ◎ ◎ ◎ ○ ○ ○ ○ ● ● ● ◎ ◎ ◎ ◎ ◎ ○ ○ ○ ○ ● ● ● ◎ ◎ ?試問:黑珠共的幾個?
16、觀察下面已給出的數表,并按規律填空:
5
9 11 15 17 19 23()27 29
33 35()39 41
17、昨天是9日,今天是星期三,29日是星期幾? 【答案】昨天是9日,今天就是10日(星期三),再過1個星期、2個星期、3個星期都是星期三10日再過19天就是29日,所以,要看19天中有多少個7天,還余幾天。
29-10=19(天)
19÷7=2?? 5
星期三再過5天就是星期一,所以,29日是星期一。
18、小明1999年已經20多歲了,可是他1996年才過第6個真正的生日。問,小明出生在幾月幾日,1999年小明幾歲(小明剛出生那天算做第1個生日)?
【答案】20多歲的人才說過了6次生日,說明他得生日(日期)不是每年都有,或者說他得生日幾年才出現一次,這個日子很特殊,只能是閏年的2月29日。在1996年前,還有1992、1988、1984、1980、1976??是閏年。因為小明1996年過第6個生日,說明他是在1976年出生的!
1996-4×(6-1)=1976
小明1999年的歲數是1999-1976=23(歲)。
19、將 2~9這八個數分別填入下圖的○里,使每條邊上的三個數之和都等于18。
【答案】四個角上的數是重疊數,重疊次數都是1次。所以四個重疊數之和等于18×4-(2+3+?+9)=28。而在已知的八個數中,四數之和為28的只有:4+7+8+9=28或5+6+8+9=28。又由于18-9-8=1,1不是已知的八個數之一,所以,8和 9只能填對角處。由此得到下圖所示的重疊數的兩種填法:
“試填”的結果,只有第三個圖的填法符合題意。20、將1~8這八個數分別填入下圖的○中,使兩個大圓上的五個數之和都等于21。
【答案】中間兩個數是重復數,重復次數都是1次,所以兩個重疊數之和為21×2-(1+2+?+8)=6.在已知的八個數中,兩個數之和為6的只有1+5或者2+4。每個大圓上另外三個數之和為21-6=15。
如果兩個重疊數為1和5,那么剩下的六個數2、3、4、6、7、8平分為兩組,每組三個數之和為15的只有2+6+7=15和3+4+8=15。
如果兩個重疊數為2和4,同理可得到1+6+8=15和3+5+7=15。所以填法如下圖 21、199 + 99 + 9= 【答案】用“湊整”的方法。199 + 99 + 9=(199 + 1 - 1)+(99 + 1 - 1)+(9 + 1 - 1)= 307 22、364-(476-187)+213-(324-236)-150= 【答案】“去括號”法則,用“湊整”的方法,帶著符號搬家,“添括號”法則。
364-(476-187)+213-(324-236)-150
= 364-476+187+213-324+236-150
=(364+236)+(187+213)-(476+324)-150=600+400-800-150=50
23、海洋館里有8只海象,總共運來170千克魚給它們吃,前兩天這8只海象共吃了80千克魚,兩天后把其中的2只海象運走。剩下的魚還可以讓余下的海象吃幾天?
24、小強要清點盒子中的畫片,他叫來小紅幫忙,兩人同時開始數。小強比小紅動作快,小強數5張的時間小紅只數3張,但小強數到第30張時忘了數到幾,只好把數過的畫片全部放回盒中,再從頭開始數,當小強數到第120張時,盒子里恰好剩下2張畫片。盒子里原來有多少張畫片?
25、三堆糖果共有105顆,其中第一堆糖果的數量第二堆的3倍,而第三堆糖果的數量又比第二堆的2倍少3顆,第三堆糖果有多少顆?
【答案】學會畫線段圖表示數量關系
由圖可得:第三堆等于(105+3)÷6×2-3=33顆
26、紅旗小學三年級有甲、乙、丙三個班,一共有學生162人,如果從甲班轉出2個人到乙班,則甲、乙兩班人數相同。如果這時再從丙班轉出3個人到乙班,則乙、丙兩班人數相同。請問:甲班原來有多少人?
【答案】學會分析并畫線段圖表示數量關系
甲班轉出2個人到乙班,則甲、乙兩班人數相同,說明甲班比乙班多4人;
這時再從丙班轉出3個人到乙班,則乙、丙兩班人數相同,說明丙班比乙班多6+2=8人
由圖可得:162÷3=54人
27、小悅、冬冬、阿奇三個人去看電影,他們買了三張座位相鄰的票。他們三人的座位順序一共有多少種不同的安排方法?
28、現在有1分、2分、5分的硬幣各5枚,要用這些硬幣湊出2角錢,一共有多少種不同的湊法?
29、如圖7-11,伸出左手,估后從大拇指起開始數,當數到200的時候,正好數到哪根手指?
【答案】找準一個周期中的數,不要直接錯誤的人數周期數為5
通過觀察分析,容易發現周期中的數為(1-2-3-4-5-6-7-8),然后9又開始從大拇指數起,進行了一個循環,一個周期有8個數,所以200÷8=25次,能夠整除,故數到25個周期結束的時候恰好到了200,所以數到200時正好到了食指上。
30、如圖7-13所示,7個小朋友圍成一圈,沿順時針方向依次編號為1-7。然后,按如下方法給他們發糖:先給1號小朋友1塊糖;然后沿順時針方向隔過一個人后,給3號小朋友1塊糖;再沿順時針方向隔過兩個人后,給6號小朋友1塊糖;接著又沿順時針方向隔過一個人后,給1號小朋友1塊糖??如此反復地間隔一個人、兩個人,直到1997塊糖全部分完,那么最先發到糖的那位小朋友一共得到了多少塊糖?
【答案】通過演練操作,找出一周期,確定一周期中的數以及各個小朋友一周期能分到的糖
通過操作,發現周期中的數是(1,3,6,1,4,6,2,4,7,2,5,7,3,5),所以一周期中1號小朋友被分到了2次,故有42塊糖,然后由1997÷14=142(次)??9,得出進行了142次周期以及第15周期中輪到了7號小朋友,所以1號小朋友拿到:142×2+2=286(塊)。
31、如圖8-7(a)所示,我們用8根火柴擺放成了一條向左游動的魚,請移動3根火柴,使得這條魚掉頭向右游動;
32、如圖8-17,黑板上畫了9個點,我們可以用5條線段把它們串聯起來,而且這5條線段是可以用一筆畫成的,實際上我們可以做得更好:用4條線段就能把這9個點串聯起來,而且這4條線段仍然是用一筆畫成的。請大家找出這種畫法。
33、今有雉兔同籠,上有三十五頭,下有九十四足,問雉兔各幾何?
【答案】題目中給出了雞兔共有35只,如果把兔子的兩只前腳用繩子捆起來,看作是一只腳,兩只后腳也用繩子捆起來,看作是一只腳,那么,兔子就成了2只腳,即把兔子都先當作兩只腳的雞。雞兔總的腳數是35×2=70(只),比題中所說的94只要少94-70=24(只)。
現在,我們松開一只兔子腳上的繩子,總的腳數就會增加2只,即70+2=72(只),再松開一只兔子腳上的繩子,總的腳數又增加2,2,2,2??,一直繼續下去,直至增加24,因此兔子數:24÷2=12(只),從而雞有35-12=23(只)。
34、雞、兔共籠,雞比兔多26只,足數共274只,問雞、兔各幾只?
【答案】方法一:假設雞有50只,那么兔就有24只,總腳數=50×2+24×4=196(只)
少的腳數=274-196=78(只)
因此還要增加雞的只數,為了保持“差”是26,每增加一只雞,同時要增加一只兔,所以增加的雞數=78÷(4+2)=13(只),所以雞數=50+13=63(只),兔數=24+13=37(只)
方法二:假設雞和兔一樣多,則先把少的兔腳加上少的兔腳=26×4=104(只)
雞數=(104+274)÷(4+2)=63(只)
兔數=63-26=37(只)
35、已知一個等差數列第8項等于50,第15項等于71。請問:
(1)這個等差數列的第1項是多少?
(2)這個等差數列前10項的和是多少?
36、在一次數學競賽中,獲得一等獎的八名同學的分數恰好構成等差數列,總分為656,且第一名的分數超過了90分(滿分100分)。已知同學們的分數都是整數,那么第三名的分數是多少?
37、計算 67×12+67×35+67×52+67 【答案】原式=67×(12+35+52+1)=67×100=6700
38、計算 85×85-84×86+83×87-82×88+81×89-80×90 【答案】原式=85×85-(85-1)(85+1)+(85-2)(85+2)-(85-3)(85+3)+(85-4)(85+4)-(85-5)(85+5)
=85×85-85×85+1+85×85-4-85×85+9+85×85-16-85×85+25=1-4+9-16+25=15
39、用杯子往一個空瓶里倒水,如果倒進6杯水,連瓶共重680克,如果倒進9杯水,連瓶共重920克。求空瓶的重量。40、小明、小紅、小玲共有73塊糖。如果小玲吃掉3塊,那么小紅與小玲的糖就一樣多;如果小紅給小明2塊,那么小明的糖就是小紅的糖的2倍。問:小紅有多少塊糖?
41、有一些三位數的各位數字都不是0,且各位數字之和為6,這樣的三位數共有多少個? 【答案】對于不同情況進行枚舉分析
(1)個位為1,那么十位+百位=5,所以有(1,4)、(2,3)、(3,2)、(4,1)四種情況;
(2)個位為2,那么十位+百位=4,所以有(1,3)、(2,2)、(3,1)三種情況;
(3)個位為3,那么十位+百位=3,所以有(1,2)、(2,1)二種情況;
(4)個位為4,那么十位+百位=2,所以有(1,1)一種情況;
(5)個位為5或6,那么十位+百位=1或0,不可能;
綜上所述:這樣的三位數共有1+2+3+4=10種情況
42、甲、乙、丙三個人傳球,第一次傳球是由甲開始,將球傳給乙或丙??經過4次傳球后,球正好回到甲手中,那么一共有多少種不同的傳球方式? 【答案】學會用樹形圖的方法
由圖可知:一共有6種不同的傳球方式
43、如圖14-14,用四個完全相同的邊長分別為5、12、13的直角三角形拼成了一個“風車”,求這個風車的周長。
44、如圖14-22,一個正方體的8個頂點被截去后,得到一個新的幾何體。這個新的幾何體有幾個面?幾個頂點?幾條棱?