蓝鸽第五单元作业

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人教版2019-2020学年六年级数学下册第五单元 数学广角鸽巢问题测试题

人教版2019-2020学年六年级数学下册第五单元 数学广角鸽巢问题测试题

第五单元检测卷一、填空。

(6题3分,其余每题2分,共21分)1.把5 只鸽子放进4个笼子里,总有一个笼子里至少有()只鸽子。

2.第二小学六年级共有学生378人,其中六(1)班有学生45人。

六年级至少有()人同一天过生日;六(1)班至少有()人属相相同。

3.21 个苹果放进5个果盘里,至少有()个苹果要放进同一个果盘里。

4.阅览室喻老师给六年级9个班的班长分发故事书,其中至少有一个班的班长分到2本,这些故事书至少有( )本。

5.在六(2)班学生中,有一些同学订阅了《语文报》《现代少年报》和《儿童时代》三种报刊中的一种或几种,这些同学中至少有3人所订的报刊种类完全相同,至少有()名同学订阅了报刊。

6.有12张扑克牌(不同花色的J、Q、K各4张),洗一下反扣在桌面上,至少摸出()张牌才能保证有两张牌的颜色(红或黑)是相同的;至少摸出()张牌才能保证四种花色的牌都有;至少摸出( )张牌才能保证有三张是同一花色的。

7.木箱里装有红色球5 个、白色球4个,至少要取出()个才能保证两种颜色的球都有,至少要取出()个才能保证有两个白色球。

8.把若干个红、黄、蓝三种颜色的球放在一个盒子里,至少取出( )个球就能保证有4个球同色。

9.从1,2,3,…,50中,至少取()个不同的数,才能保证所取的数中一定有一个是5的倍数。

10.有相同款式的黑色、白色的袜子各10只(不分左右),至少拿( )只袜子,才能保证凑齐一双。

二、选择。

(将正确答案的序号填在括号里)(每题2分,共16 分)1.把25个鸡蛋最多放进()个碗中才能保证至少有一个碗中放进7 个鸡蛋。

A.1B.2C.3D.42.盒子里有8个黄球、5 个红球,至少一次摸出( )个一定会摸到红球。

A.5B.6C.8D.93.将一些书放入3个抽屉里,放得最多的抽屉至少放5本,这些书共有( )本。

A.13~15B.12~16C.12~15D.16~184.给正方体的六个面涂上不同的三种颜色,不论怎么涂,至少有( ) 个面的颜色相同。

中国海洋大学蓝鸽 第五单元答案

中国海洋大学蓝鸽 第五单元答案

B2U61. If you’re going swimming tomorrow morning, you can _______ me_______, because I’ll be preparing for an examination.[1].A) count …on B) count …in C) count …down D) count… ou t2. I can’t see the view well because there are some buildings______.[2].A) in a way B) in the way C) in that way D) in no way3. Mary likes Peking Opera, _______Jack, who hates it.[3].A) opposed to B) as opposed withC) as opposed to D) as opposed for4. The prisoner has been ______ of many privileges that average citizens enjoy.[4].A) disturbed B) discarded C) deprived D) disposed5. Experts say swimming is one of the best ways for a person to _______healthy.[5].A) deserve B) stay C) obey D) reserve6. It was a bold idea to build a power station in the deep valley, but it _______as well as we had hoped.[6].A) came off B) went off C) brought out D) made out7. In education there should be a good ______ among the branches of knowledge that contribute to effective thinking and wise judgment.[7].A) distribution B) balance C) combination D) assignment8. If he _____giving up smoking, he can make it.[8].A) sets the mind on B) sets his mind onC) has a mind D) gives his mind to9. I’d be ______ to resign if I were in your position.[9].A) influenced B) effected C) inclined D) related10. When there are small children around, it is necessary to put the bottles of pills out of _____.[10].A) reach B) hand C) hold D) place11. It would be better if you _______ at a gym or swim twice a week.[11].A) work off B) work out C) work up D) work on12. We’ve done a lot of work and we ______ a break.[12].A) are worth B) are worthy of C) are valuable of D) deserve13. Fire engines and ambulances have ______ over other traffic.[13].A) priority B) urgency C) superiority D) emergency14. I _______ a note under Louise’s door.[14].A) slid B) decreased C) descended D) slipped15. In _____ with the new regulations, all tickets must be stamped.[15].A) combination B) accordance C) connection D) tune16. The cars were ______ because it was impossible to go any further in the fog.[16].A) sacrificed B) transported C) removed D) abandoned17. We will be exploring different approaches _______ information.[17].A) gathering B) in gatheringC) to gathering D) to gather18. Julie’s anger slowly _____ after she heard Robert’s explanation.[18].A) disappeared away B) vanished awayC) melted away D) passed away19. An unknown terrorist group has _____ responsibility for this morning’s bomb attack.[19].A) claimed B) exclaimed C) demanded D) maintained20. He has great confidence in _____ the company_______.[20].A) turning… up B) turning …over C) turning …. around D) turning t21.He tried to fix my radio, but really ______ it up.[21].A) made B) botched C) covered D) filled22.The Italian political system has been judged to be in terminal _____ for decades.[22].A) difficulty B) danger C) crisis D) prosperous23. We must strengthen our _____ on the western border.[23].A) offense B) defects C) defense D) defendants24. The real estate agent has the _____ right to sell the house.[24].A) single B) overall C) alone D) exclusive25. _____ of romance and true love motivated her to live happily.[25].A) Fantasies B) Nightmares C) Dlusions D) Impressions26. He was awarded a certificate of _____ for his piano playing.[26].A) glory B) distinct C) praise D) merit27. They include the floor exercises as a regular part of their fitness _____.[27].A) order B) habit C) routine D) arrangement28. I am doubtful whether I can solve the puzzle, but I’ll have a ____ at it.[28].A) shoot B) shot C) attempt D) try29. The old man claimed to be able to divine what the stars hold ____ for us.[29].A) in store B) in shop C) in saving D) storing30. The market _____ shows that the new products have enormous potential if they are well developed.[30].A) inspection B) symbol C) support D) survey31. The new product is on ____ before it is put on the market.[31].A) test B) trial C) experiment D) inspection32. Unworthy buildings should be demolished to make ____ for modern construction.[32].A) space B) room C) margin D) leeway33. There is something wrong with the _____ of the phone.[33].A) sound B) wave C) recipient D) voice34. The boss told him " ____ wasting time! Fish or cut bait.[34].A) Resign B) Block C)Quit D) Leav35. If you __________ with something, you keep trying to do it and do not give up, even though it is difficult.[35].A) insist B) continue C) endure D) persevere36.The army 's top brass seem in tune ______ their president in seeing Islamist terrorists as the most dangerous enemy facing Pakistan .[36].A) to B) on C) with D) of37.The debate will go down as a _______ in this campaign.[37].A) turning B) returning C) turning point D) returning point38.If you learn this lesson, you will _____ a wise, wealthy and happy young man.[38].A) into B) with C) in D) up with39.Another challenge to me was not to _____ myself ___ if I ate something that was unhealthy.[39].A) beat … out B) beat … up C) beat … off D) beat … around40.Most people agree that ______ tastes great, but that it is not the healthiest thing you can eat.[40].A) desert B) decent C) desent D) dessert41.He was loud and angry, and his friends told him to _____ his behavior.[41].A) modify B) convert C) transform D) differ42.Be careful how you_____; it's a long way from the ground.[42].A) get off B) step off C) step up D) lead off43.But, ___ reflection, I think I did the "young guy" a favor by not giving him a job.[43].A) in B) with C) on D) over44. The girl ___ me along the aisle to my seat.[44].A) accompanied B) ushered C) conducted D) guided45. Someone who doesn't observe traffic regulations will sweat.[45].A) persist B) observe C) insist D) persevere46. The coach jolted its passengers over the_______ road.[46].A) miserable B) sorrowful C) sorry D) unhappy47. Today I 'm on medication to control my emotional __________.[47].A) on and off B) up and down C) ups and downs D) ins and outs48. It is not enough only to __________ the rules of grammar if you want to learn English well.[48].A) have in mind B) keep in mind C) make up your mind D) keep your head49. News organizations should pay their own way when sending staff to ______ sporting or cultural events.[49].A) combine B) associate C) cover D) attach50. The tide is, ______ , very high.[50].A) at a time B) at times C) at the time D) at other time。

小学数学-有答案-人教版数学六年级下册第五单元《数学广角—鸽巢问题》单元测试卷

小学数学-有答案-人教版数学六年级下册第五单元《数学广角—鸽巢问题》单元测试卷

小学数学-有答案-人教版数学六年级下册第五单元《数学广角—鸽巢问题》单元测试卷一、解答题1. 10只鸽子飞回3个鸽舍,至少有几只鸽子要飞进同一个鸽舍里?2. 我校四年级共有735名学生,总有至少多少名学生在同一天过生日?3. 有红、黄、蓝三种颜色的小球各110个,混放在一个布袋里,一次至少摸出多少个球,才能保证有5个是同一种颜色的?4. 一个布袋里有红、白、蓝、绿四种球各10个,它们的大小和质量都一样,至少要摸出多少个,才能保证其中至少有4个颜色相同的球?至少要摸出多少个,才能保证有4种不同颜色的球?5. 盒子里有大小相同的红、黄、蓝、白四种颜色的球各12个,要想摸出的球一定有2个是同色的,至少要摸出几个球?6. 有13个箱子,现在往里面装苹果,要求每个箱子里装的苹果都是奇数个,无论这些苹果怎么放,总能找到4个箱子的苹果个数是一样的,问:最多有多少个苹果?7. 重阳节那天,敬老院买来了3种水果,每位老人任选两个,那么至少应有多少位老人才能保证必有两位或两位以上的老人所选的水果相同?8. 从1到2006中,至少要取出多少个奇数,才能保证其中必定存在两个数,他们的和为2008?9. 一个布袋中有40块相同的木块,其中编上号码1,2,3,4的各有10块。

问:一次至少要取出多少木块,才能保证其中至少有3块号码相同的木块?10. 某幼儿班有40名小朋友,现有各种玩具122件,把这些玩具全部分给小朋友,是否会有小朋友得到4件或4件以上的玩具?11. 六年级有100名学生,他们都订阅甲、乙、丙三种杂志中的一种、二种或三种.问:至少有多少名学生订阅的杂志种类相同?12. 篮子里有苹果、梨、桃和桔子,现有81个小朋友,如果每个小朋友都从中任意拿两个水果,那么至少有多少个小朋友拿的水果是相同的?参考答案与试题解析小学数学-有答案-人教版数学六年级下册第五单元《数学广角—鸽巢问题》单元测试卷一、解答题1.【答案】4只【考点】抽屉原理整数的加法和减法有余数的除法应用题【解析】此题暂无解析【解答】根据10只鸽子飞回3个鸽舍,10÷3=3...1,即平均每个鸽舍飞进3只鸽子后,剩下的一只鸽子无论怎么飞至少3+1=4(只)鸽子要飞进同一个鸽舍里.所以至少有4只鸽子要飞进同一个鸽舍里.2.【答案】3名【考点】抽屉原理整数的加法和减法整数的乘法及应用【解析】此题暂无解析【解答】一年最多有366天,735+366=2.……3人,最坏的情况是,每天都有两名学生过生日,还余3名学生,所以总有至少2+4=3名学生在同一天过生日.答:至少3名学生在同一天过生日.3.【答案】13个球【考点】抽屉原理可能性的大小数学广角——鸽巢问题此题暂无解析【解答】建立鸽巢:把红黄蓝三种颜色分别看做3个鸽巢.考虑最差情况:摸出12个小球,每个鸽巢都有4个小球,此时再任意摸出1个小球,无论放到哪个鸽巢都会出现5个颜色相同的小球,所以12+|=33(个).答:一次至少摸出13个球,才能保证有5个是同一种颜色的.4.【答案】13个,31个【考点】抽屉原理可能性的大小数学广角——鸽巢问题【解析】此题暂无解析【解答】把10种不同颜色看作10个抽屉,把40种不同颜色的球看作40个元素,从最不利情况考虑:(1)每个抽屉放3个需要3×4=12个,再取出1个不论是什么颜色,总有一个抽屉里的球和它同色,所以至少要取出12+1=13(个).(2)先把其中的3种球取尽,共需要3×10=30个,再取出1个(剩下的球),就能保证有4种不同颜色的球,所以至少要取出30+1=3(个)答:至少要摸出13个,才能保证其中至少有4个颜色相同的球;至少要摸出31个,才能保证有4种不同颜色的球.5.【答案】5个球【考点】抽屉原理可能性的大小数学广角——鸽巢问题【解析】此题暂无解析【解答】盒子里有同样大小的红、黄、蓝、白四种颜色的球,最坏的情况是,当摸出4个球的时候,红、黄、蓝、白四种颜色的各一个,此时只要再任意摸出一个球,摸出的球一定有2个同色的,即至少要摸出4+|=5个.答:至少要摸出5个球,摸出的球一定有2个同色的.6.【答案】公约数与公倍数问题奇偶性问题整数的除法及应用【解析】此题暂无解析【解答】把箱子分成3组,每组4个,共12个,另外还剩下一个单独的箱子,每组4个箱子里分别放入1、3、5、7个苹果,为使苹果数最多,则第13个箱子里也放入7个苹果,所以最多共有(1+3+5+7)×3+7=55个苹果.7.【答案】7位【考点】抽屉原理数学广角——鸽巢问题排列组合【解析】此题暂无解析【解答】三种水果,假设是苹果、橘子、梨;每位老人任意选两个,共有3×2=6种可能(苹果苹果,橘子橘子,梨梨,苹果橘子,苹果梨,橘子梨),最差情况是6位老人拿的不同,所以应有6+|=7位老人,才能保证有两个或两个以上的老人拿的一样.答:至少应有7位老人才能保证必有两位或两位以上的老人所选的水果相同.8.【答案】503个奇数【考点】抽屉原理2、3、5的倍数特征数学广角——鸽巢问题【解析】此题暂无解析【解答】从1到2006中总共有2006−2=1003个奇数,3+2005=2008,5+2003=2008到1003+1005=2008,和为2008的奇数对有1003+2=50对...1个.最坏的情况是一直取不到符合条件的奇数对,一直到不成对的全部取完,即每对只取一个;因此,第500+1+|=503个奇数一定能在之前取到的奇数中找到与其之和为2008的对应奇数.答:至少要取出503个奇数才能保证其中必定存在两个数,他们的和为2008.9.抽屉原理数学广角——鸽巢问题因数和倍数的意义【解析】此题暂无解析【解答】将1,2,3,4四种号码看成4个抽屉.要保证有一个抽屉中至少有3件物品,根据抽屉原理2,至少要有4×2+1=9(件)物品.所以一次至少要取出9块木块,才能保证其中有3块号码相同的木块.10.【答案】至少会有一个小朋友得到4件或4件以上的玩具【考点】整数的除法及应用整数、小数复合应用题图文应用题【解析】此题暂无解析【解答】将40名小朋友看成40个抽屉.今有玩具122件,122=3×40+2.应用抽屉原理2,取n=40,m=3,立即知道:至少有一个抽屉中放有4件或4件以上的玩具.也就是说,至少会有一个小朋友得到4件或4件以上的玩具.11.【答案】15名【考点】抽屉原理排列组合数学广角——鸽巢问题【解析】此题暂无解析【解答】首先应当弄清订阅杂志的种类共有多少种不同的情况.订一种杂志有:订甲、订乙、订丙3种情况;订二种杂志有:订甲乙、订乙丙、订丙甲3种情况;订三种杂志有:订甲乙丙1种情况.总共有3+3+1=7(种)订阅方法.我们将这7种订法看成是7个“抽屉”,把100名学生看作100件物品.因为100=14×7+2.根据抽屉原理2,至少有14+1=15(人)所订阅的报刊种类是相9个【考点】抽屉原理数学广角——鸽巢问题因数和倍数的意义【解析】此题暂无解析【解答】首先应弄清不同的水果搭配有多少种.两个水果是相同的有4种,两个水果不同有6种:苹果和梨、苹果和桃、苹果和桔子、梨和桃、梨和桔子、桃和桔子.所以不同的水果搭配共有4+6=10(种).将这10种搭配作为10个“抽屉”.84÷10=8...1(个).根据抽屉原理2,至少有8+1=9(个)小朋友拿的水果相同.。

中国海洋大学蓝鸽B3U5答案

中国海洋大学蓝鸽B3U5答案

以下答案已根据网上资料及个人理解做出矫正,正确率90%,欢迎同学们参考,限于本人水平有限,如有错误敬请谅解!:)【中国海洋大学蓝鸽答案大学英语3第五单元】1.I would never have ____ a court of law if I hadn't been so desperate.A) sought for B) accounted for C) turned up D) resorted to[1]. D2. In the senten ce “Hand-printed on the paper in tiny block letterswas this:…”, “block” means ________.A) capital B) vague C) building D) suspicious[2]. A3. He was proud of being chosen to participate in the game and he ____us that he would try as hard as possible.A) insured B) guaranteed C) assured D) assumed[3]. C4. You will not be very ____ about your food in times of great hunger.A) special B) particular C) peculiar D) specific[4]. B5. She was deeply _____by the conviction of her son for his rapingoffences.A) submitted B) committed C) distressed D) subjected[5]. C6. I carry a notebook so that I can ______ down any ideas I may have for the writing assignments.A) assume B) grant C) press D) jot[6]. D7. He is sentenced to death because he has _____ adultery and murder.He deserves it!A) recommended B) commanded C) committed D) commended[7]. C8. While admitting that forecast was ____ uncertain, the scientists warned against treating it as a cry of wolf.A) anyhow B) somewhere C) somewhat D) anyway[8]. B9. They ____ me by asking so many questions. As a result, I even didn'tknow what I had said to them.A) accused B) confused C) defused D) confuted[9]. B10. This type of building is ____to the south of the country.A) suspicious B) idiomatic C) idyllic D) peculiar[10]. B11. I’ve been _____my brains all day but I can’t remember her name.A) banging B) picking C) racking D) racing[11]. C12. Ann’s disappointed that she hasn’t ____ for the next round in thetennis competition.A) retreated B) qualified C) recited D) retracted[12]. B13. You should not dwell too much _____ your past failures.A) in B) at C) of D) on[13]. D14. It’s one thing to understand the principle; it’s ____ to put it into practice.A) other B) another C) second D) the other[14]. D15. The weather report says another hurricane is _______ to come in twodays.A) perhaps B) probable C) ready-made D) likely[15]. D16. I am feeling sick. I ____ so much chocolate.A) needn't have eaten B) shouldn't have eatenC) couldn't have eaten D) mustn't have eaten[16]. B17. He’s given several _____ to the boss that he’ll quit if he doesn’t get a promotion.A) raises B) hints C) implies D) inference[17]. B18. He is quite sure that it’s ______ impossible for him to fulfill thetask within two days.A) absolutely B) exclusively C) fully D) roughly[18]. A19. Advertisements may mislead some consumers _____ things that they don’t need.A) to buy B) of buying C) in buying D) into buying[19]. D20. When we have agreed broadly on what should be said, the secretarywill produce a preliminary ______ for the committee’s approval.A) project B) design C) draft D) drawing[20]. C21. Think ahead what you might say, so you don't get ___________.A) well-respected B) instructional C) tongue-tied D) editorial[21]. C22. In the realist viewpoint, the tendency toward self-help outweighsany ________ to selflessly improve the world.A) inclination B) suspicion C) calculation D) hesitation[22]. A23. The young man ____ himself in eating and drinking, and soon foundthat he was bankrupt.A) renewed B) addicted C) refreshed D) indulged[23]. D24. It turned out that he bought the book ________ at that bookstore on Elm Street.A) utility B) utilization C) freshman D) second-hand[24]. D25. Harold claimed that he was a serious and well-known artist, but infact he was a(n) _____ .A) alien B) client C) counterpart D) fraud[25]. D26.He gave me a great book--- A Guide to English Grammar and ______.A) Dwarf B) Usage C) Draft D) Raft[26]. B27. Neither of my children showed the slightest ____ to follow me into journalism.A) intuition B) inclination C) instinct D) interest[27]. B28. After China’s entry into WTO, many Chinese ____ English in their 40s or older.A) picked up B) picked out C) picked at D) picked on[28]. A29. We'll meet again in the morning and we can start from where we_____ .A) left on B) left off C) left for D) left up[29]. B30. The idea of working abroad really ____to me.A) attracts B) approves C) appeals D) appreciates[30]. C31. I could see at the meeting that the director was determined to ______ the truth.A) get off B) get on C) get out D) get at[31]. C32. American women were _____ the right to vote until 1920 after manyyears of hard struggle.A) ignored B) discriminated C) neglected D)denied[32]. D33. In the foggy season in Qingdao, if clothes are not cleaned and driedproperly, they may _____!A) stink B) terrible C) sting D) taste[33]. A34. Kopi Luwak, also called civet coffee in English, is considered _____coffee by many connoisseurs.A) beauty B) gourmet C) ready-made D) independent[34]. C35. Crime does not necessarily ______ poverty; criminals with wealth arenot uncommon.A) go along B) go about C) go at D) go with[35]. D36. 'Going to the party on Saturday?'' _____!'A)I bet B) You bet C) We bet D) I get[36]. B37. The exhibition ______ paintings by Picasso.A)focuses B) frowns C) characterizes D)features[37]. D38. A healthy life is frequently thought to be ________ the opencountryside and homegrown food.A) tongue-tied B) bound to C) involved in D) associatedwith[38]. D39. There must be a party ____ next door. It's too noisy for me to go over my lessons.A)going with B) getting at C) going into D) going on[39]. D40. He likes to be ______ 'Doctor Khee' although he is neither a medicaldoctor nor a doctor in other fields.A) regarded B) referred to as C) condensed as D) be considerate[40]. B41. _____ that this has been a difficult year for the company.A) It is no possibility B) It is small wonderC) There is no denying D) There is no chance[41]. C42. After making the joke, the teacher said to the students: “pleasedon’t take what I said ________.”A) to a ride B) seriously C) around D) to the extreme[42]. B43. Before the final exam, Frank _____over mathematics.A) traced down B) broke his back C) sit back D) tracked down[43]. B44. I looked at the map to _____ my memory of the route.A) release B) remain C) refresh D) flesh[44]. C45. Rising prison population and overcrowding _____ a real crisis.A) associate with B) add up to C) relate to D) assume with[45]. B46. A ______man believes he’s always right about everything.A)conceited B) conceived C) deceptive D)complicated[46]. A47.The doctors were ____ by his symptoms and had to call in a specialistin neurology.A) stamped B) stirred C) stumped D) dumped[47]. C48. The sun is a(n) ______ powerful source of energy.A) frequently B) unexpectedly C) constantly D) extraordinarily[48]. D49. Marilyn is very upset that her boyfriend forgot her birthday, butshe will ____ it soon.A) acquire B) get over C) peek at D) burst into[49]. B50. After the nasty fights over the custody of baby John, the couplerealized how much they loved their child and decided to start ______ again, not to divorce.A) go over B) get over C) roll over D) all over[50]. D。

人教版六年级下册数学第五单元《鸽巢问题3》测试卷及答案

人教版六年级下册数学第五单元《鸽巢问题3》测试卷及答案

鸽巢问题
1.有红、黄、蓝三种颜色的玻璃球各7颗,放在一个袋子里,一次摸出8颗,至少有多少颗玻璃球的颜色相同?
在解决这个问题时,把()看作抽屉,一共有()个抽屉。

2.希望小学篮球兴趣小组的同学中,最大的12岁,最小的6岁,最少从中挑选几名学生,就能找到两名年龄相同的?
3.有黑色、白色、蓝色、红色手套各10只(不分左、右手),至少要拿出多少只(拿的时候不看颜色),才能保证在拿出的手套中一定有两只相同颜色的手套?
4.一个鱼缸里有很多条鱼,共有5个品种。

至少要捞出多少条鱼,才能保证有4条鱼的品种相同?
5.盒子中有15个黄球,10个红球,8个黑球。

(1)至少摸出()个球,才能保证有2个球的颜色相同。

(2)至少摸出()个球,才能保证有2个不同颜色的球。

(3)至少摸出()个球,才能保证3种颜色的球都有。

参考答案
1.颜色 3
8÷3=2(颗)……2(颗)
2+1=3(颗)
答:至少有3颗玻璃球的颜色相同。

2.答:最少从中挑选8名学生,就能找到两名年龄相同的。

3.答:至少要拿出5只。

4.答:至少要捞出16条鱼。

5.(1)4 (2)16 (3)26。

人教版六年级下册数学第五单元《鸽巢问题》测试卷及答案

人教版六年级下册数学第五单元《鸽巢问题》测试卷及答案

第5单元达标作业1.填一填。

(1)把7只鸡放进4个鸡笼,至少有()只鸡要放进同一个鸡笼里。

(2)在369个2018年出生的儿童中,至少有()个人是同一天出生的。

(3)暗箱里有同样大小的蓝球和红球各5个。

要想使摸岀的球一定有2个是同色的,最少要摸出()个球。

(4)23个学生要分到7个班,至少有()个人要分进同一个班。

(5)一个不透明的盒子里装有红、黑、白玻璃球各3个,要保证取出的玻璃球3种颜色都有,至少应取出()个;要使取出的玻璃球中至少有2种颜色,至少应取出()个。

2.选一选。

(把正确答案的字母填在括号里)(1)明明玩掷骰子的游戏,要保证掷岀的骰子点数至少有两次相同,他最少应掷()次。

A.6B.7C.8(2)从自然数1~24中至少取()个数才能保证其中两个数的差是5的倍数。

A.6B.8C.10(3)一个盒子里装有黄、白两种颜色的乒乓球(除颜色外其他完全相同)各5个,要想使取出的乒乓球中一定有两个黄色的乒乓球,则至少应取出()个乒乓球。

A.5B.6C.73.如图,要想摸出的笔一定有2种颜色,至少要摸出几支笔?4.给一个正方体木块(如图)的6个面分别涂上红、黄、蓝三种颜色,无论如何涂至少有多少个面的颜色相同?为什么?5.从1~10这10张数字卡片中任意取出6张,至少有多少张卡片上的数字奇偶性不同?至多有多少张卡片上的数字奇偶性相同?6.有英小学六年级有280人,男生和女生人数的比是1∶1,至少随机选出多少人,才能保证选出的学生中男、女生都有?7.从一副扑克牌中抽去大、小王两张牌,从剩余的52张牌中任意取牌。

(1)至少要取出多少张才能保证有4张方块?(2)要想抽出的牌中一定有2张同种颜色的,至少要抽多少张?(3)要想抽出的牌中一定有2张同样点数的,至少要抽多少张?8.李师傅说:“在10个保温瓶中有2个是次品,要保证取出的保温瓶中至少有1个是次品,至少应取出3个。

”他说得对吗?为什么?参考答案1.(1)2 (2)2 (3)3 (4)4 (5)7 42.(1)B (2)A (3)C3.5+1=6(支)答:至少要摸出6支笔。

(必考题)小学数学六年级下册第五单元数学广角(鸽巢问题)测试题(有答案解析)(5)

(必考题)小学数学六年级下册第五单元数学广角(鸽巢问题)测试题(有答案解析)(5)

(必考题)小学数学六年级下册第五单元数学广角(鸽巢问题)测试题(有答案解析)(5)一、选择题1.口袋里有红、黄、蓝三种颜色的小球各3个,一次至少取出()个,才能保证取出的小球一定有3个球的颜色相同。

A. 3B. 5C. 7D. 92.一个袋子里有红、白、蓝三种颜色的球各10个,至少拿出()个,才能保证有3个球的颜色相同。

A. 7B. 4C. 213.一个布袋中装有若干只手套,颜色有黑、红、蓝、白4种,至少要摸出( )只手套,才能保证有3只颜色相同。

A. 5B. 8C. 9D. 12 4.1000只鸽子飞进50个巢,无论怎么飞,我们一定能找到一个含鸽子最多的巢,它里面至少有( )只鸽子。

A. 20B. 21C. 22D. 235.在任意的37个人中,至少有()人属于同一种属相.A. 3B. 4C. 5D. 26.黑桃和红桃扑克牌各5张,要想抽出3张同类的牌,至少要抽出()张.A. 3B. 5C. 6D. 87.把红、黄、蓝、白四种颜色的球各8个放到一个袋子里,至少要取()个球,才可以保证取到三个颜色相同的球.A. 9B. 8C. 5D. 138.小明参加飞镖比赛,投了10镖,成绩是91环,小明至少有一镖不低于()环.A. 8B. 9C. 109.王老师把36根跳绳分给5个班,至少有()根跳绳分给同一个班.A. 7B. 8C. 910.清平中心小学98班有52人,彭老师至少要拿()作业本随意发给学生,才能保证至少有有个学生拿到2本或2本以上的本子.A. 53本B. 52本C. 104本11.袋子中有红、黄、蓝球各4个,至少任意拿出()个球,才能保证某种颜色的球有2个.A. 3B. 4C. 5D. 7 12.10个孩子分进4个班,则至少有一个班分到的学生人数不少于()个.A. 1B. 2C. 3D. 4二、填空题13.在每个格子中任意画上符号“☆”和“△”,则下面9列中,至少有________列的符号是完全一样的。

最新人教版六年级下册小学数学第五单元数学广角(鸽巢问题)测试题(有答案解析)

最新人教版六年级下册小学数学第五单元数学广角(鸽巢问题)测试题(有答案解析)
三、解答题
21.从 13 个连续的自然数中,一定可以找到两个数,它们的差是 12 的倍数。任意取多少 个连续的自然数,才能保证至少有两个自然数的差是 7 的倍数? 22.黑、白、黄三种颜色的筷子各有很多根,在黑暗处至少拿出几根筷子就能保证有一双 是相同颜色的筷子? 23.一幅扑克牌有 54 张,最少要抽取几张牌,方能保证其中至少有 2 张牌有相同的点 数? 24.从 1,4,7,10,…,37,40 这 14 个数中任取 8 个数,试证:其中至少有 2 个数的和 是 41. 25.某次选拔考试,共有 1123 名同学参加,小明说:“至少有 10 名同学来自同一个学 校.”如果他的说法是正确的,那么最多有多少个学校参加了这次入学考试? 26.52 名同学答 2 道题,规定答对一道得 3 分,不答得 1 分,答错得 0 分,至少有几名同 学的成绩相同?
A. 9
B. 10
C. 11
3.5 只小鸡被装进 2 个鸡笼,总有一个鸡笼至少有( )只小鸡。
D. 12
A. 2
B. 3
C. 4
4.14 个同学中,一定有( )人是在同一个月出生的。
A. 2
B. 3
C. 4
5.袋中有 60 粒大小相同的弹珠,每 15 粒是同一种颜色,为保证取出的弹珠中一定有 2
粒是同色的,至少要取出( )粒才行。
3.B
解析: B 【解析】【解答】5÷2=2(只)……1(只), 至少:2+1=3(只). 故答案为:B. 【分析】抽屉原理的公式:a 个物体放入 n 个抽屉,如果 a÷n=b……c,那么有一个抽屉至少 放(b+1)个物体,据此解答.
4.A
解析: A 【解析】【解答】14÷12=1(个)……2(个), 至少:1+1=2(个). 故答案为:A. 【分析】抽屉原理的公式:a 个物体放入 n 个抽屉,如果 a÷n=b……c,那么有一个抽屉至少 放(b+1)个物体,据此解答.
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Unit 51.I would never have ____ a court of law if I hadn't been so desperate.A) sought for B) accounted for C) turned up D) resorted to2. In the sentence “Hand-printed on the paper in tiny block letters was this:…”,“block” means ________.A) capital B) vague C) building D) suspicious3. He was proud of being chosen to participate in the game and he ____ us that hewould try as hard as possible.A) insured B) guaranteed C) assured D) assumed4. You will not be very ____ about your food in times of great hunger.A) special B) particular C) peculiar D) specific5. She was deeply _____by the conviction of her son for his raping offences.A) submitted B) committed C) distressed D) subjected6. I carry a notebook so that I can ______ down any ideas I may have for the writing assignments.A) assume B) grant C) press D) jot7. He is sentenced to death because he has _____ adultery and murder. He deserves it!A) recommended B) commanded C) committed D) commended8. While admitting that forecast was ____ uncertain, the scientists warned against treating it as a cry of wolf.A) anyhow B) somewhere C) somewhat D) anyway9. They ____ me by asking so many questions. As a result, I even didn't know what Ihad said to them.A) accused B) confused C) defused D) confuted10. This type of building is ____to the south of the country.A) suspicious B) idiomatic C) idyllic D) peculiar11. I’ve been _____my brains all day but I can’t remember her name.A) banging B) picking C) racking D) racing12. Ann’s disappointed that she hasn’t ____ for the next round in the tenniscompetition.A) retreated B) qualified C) recited D) retracted13. You should not dwell too much _____ your past failures.A) in B) at C) of D) on14. It’s one thing to understand the principle; it’s ____ to put it into practice.A) other B) another C) second D) the other15. The weather report says another hurricane is _______ to come in two days.A) perhaps B) probable C) ready-made D) likely16. I am feeling sick. I ____ so much chocolate.A) needn't have eaten B) shouldn't have eatenC) couldn't have eaten D) mustn't have eaten17. He’s given several _____ to the boss that he’ll quit if he doesn’t get a promotion.A) raises B) hints C) implies D) inference18. He is quite sure that it’s ______ impossible for him to fulfill the task within twodays.A) absolutely B) exclusively C) fully D) roughly19. Advertisements may mislead some consumers _____ things that they don’t nee d.A) to buy B) of buying C) in buying D) into buying20. When we have agreed broadly on what should be said, the secretary will producea preliminary ______ for the committee’s approval.A) project B) design C) draft D) drawing21. Think ahead what you might say, so you don't get ___________.A) well-respected B) instructional C) tongue-tied D) editorial22. In the realist viewpoint, the tendency toward self-help outweighs any ________ toselflessly improve the world.A) inclination B) suspicion C) calculation D) hesitation23. The young man ____ himself in eating and drinking, and soon found that he wasbankrupt.A) renewed B) addicted C) refreshed D) indulged24. It turned out that he bought the book ________ at that bookstore on Elm Street.A) utility B) utilization C) freshman D) second-hand25. Harold claimed that he was a serious and well-known artist, but in fact he was a(n)_____ .A) alien B) client C) counterpart D) fraud26.He gave me a great book--- A Guide to English Grammar and ______.A) Dwarf B) Usage C) Draft D) Raft27. Neither of my children showed the slightest ____ to follow me into journalism.A) intuition B) inclination C) instinct D) interest28. After China’s entry into WTO, many Chinese ____ English in their 40s or older.A) picked up B) picked out C) picked at D) picked on29. We'll meet again in the morning and we can start from where we_____ .A) left on B) left off C) left for D) left up30. The idea of working abroad really ____to me.A) attracts B) approves C) appeals D) appreciates31. I could see at the meeting that the director was determined to ______ the truth.A) get off B) get on C) get out D) get at32. American women were _____ the right to vote until 1920 after many years of hardstruggle.A) ignored B) discriminated C) neglected D) denied33. In the foggy season in Qingdao, if clothes are not cleaned and dried properly, theymay _____!A) stink B) terrible C) sting D) taste34. Kopi Luwak, also called civet coffee in English, is considered _____ coffee bymany connoisseurs.A) beauty B) gourmet C) ready-made D) independent35. Crime does not necessarily ______ poverty; criminals with wealth are notuncommon.A) go along B) go about C) go at D) go with36. 'Going to the party on Saturday?'' _____!'A)I bet B) You bet C) We bet D) I get37. The exhibition ______ paintings by Picasso.A)focuses B) frowns C) characterizes D) features38. A healthy life is frequently thought to be ________ the open countryside andhomegrown food.A) tongue-tied B) bound to C) involved in D) associated with39. There must be a party ____ next door. It's too noisy for me to go over my lessons.A)going with B) getting at C) going into D) going on40. He likes to be ______ 'Doctor Khee' although he is neither a medical doctor nor adoctor in other fields.A) regarded B) referred to as C) condensed as D) be considerate41. _____ that this has been a difficult year for the company.A) It is no possibility B) It is small wonderC) There is no denying D) There is no chance42. After making the joke, the teacher said to the stud ents: “please don’t take what Isaid ________.”A) to a ride B) seriously C) around D) to the extreme43. Before the final exam, Frank _____over mathematics.A) traced down B) broke his back C) sit back D) tracked down44. I looked at the map to _____ my memory of the route.A) release B) remain C) refresh D) flesh45. Rising prison population and overcrowding _____ a real crisis.A) associate with B) add up to C) relate to D) assume with46.A ______man believes he’s always right about everything.A)conceited B) conceived C) deceptive D) complicated47.The doctors were ____ by his symptoms and had to call in a specialist inneurology.A) stamped B) stirred C) stumped D) dumped48. The sun is a(n) ______ powerful source of energy.A) frequently B) unexpectedly C) constantly D) extraordinarily49. Marilyn is very upset that her boyfriend forgot her birthday, but she will ____ itsoon.A) acquire B) get over C) peek at D) burst into50. After the nasty fights over the custody of baby John, the couple realized howmuch they loved their child and decided to start ______ again, not to divorce.A) go over B) get over C) roll over D) all over。

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