五年级奥数___分数的拆分.doc

分数的拆分专题分析：在英国伦敦的博物馆中，陈列着十九世纪苏格兰考古学家兰特在埃及发现的纸草书，后人称之为兰特纸草书。在兰特纸草书上，人们发现了独特的埃及分数，这些分子为1的分数用不同的象形文字记载着很多历史古题。比如78121418，有人按兰特纸草书的记载这样解释：把7个面包平均分给8个人，不但每个人分的数量一样多，而且每人分的块数也一样多。可以这样分，把其中四个面包每个切成两等份，把另两个面包每个切成四等份，最后一个切成八等份，每人拿大、中、小面包各一份。这有多妙啊！下面我们就研究一些类似的问题。例1：把11根糖棒平均分给12个人，每根糖棒同样长，分时一次只能切一根，且要平均分。问：最少要切几刀？例2：在1/6=1/（ ）1/（ ）的括号中填入不同的整数使等式成立。例3：将2/3拆分成两个不同单位分数之和的形式。例4：在1/（ ）1/（ ）1/（ ）1/（ ）1/（ ）1/（ ）=1的括号中填入互不相同的自然数，使等式成立。例5：计算。例6：计算。例7：计算例8：计算：。练习：1、求出下列各分数所有形如的表达式，其中a、b为不等的整数： 2、求出、所有形如的表达式，其中a、b为不等的整数。3、计算。4、计算244668182020222224。5、计算。6、A、B、C是三个互不相同的自然数，并且满足：，求。7、从下面的分数中找出10个来，使它们的和为1（不许重复）： 1，奥数小测验1.有三个自然数，它们相加或相乘，都得到相同的结果，这三个数中最大的是 。2四个人年龄之和是77 岁。最小的10 岁，他与最大的年龄之和比另外二人年龄之和大7 岁，最大的年龄是 岁。3把被减数、减数、差相加得40，被减数是 。4有一幢楼房高17 层，相邻两层间都有17 个台阶。某人从一层走到十一层，一共要登 个台阶。5有100 位旅客，其中有10 人既不懂英语，又不懂俄语，有75 人懂英语，83 人懂俄语，既懂英语又懂俄语的有 人。6有一块三角形地，三条边分别为120 米、150 米、80 米，每10 米种一棵树，三条边上共种树 棵。7从401 到1000 的所有整数中，被8 除余数为1 的数有 个。8用一个自然数与它自己相减、相加、相除所得的差、和、商三个数加起来恰好等于101，这个自然数是 。9四三班上操正好排成人数相等的三行，小明排在中间一行，从前从后数都是第八个，全班有学生 人。10把数字5 写到一个三位数的左边，再把得到的四位数加上400，这时，他们的和是这个三位数的55 倍，这个三位数是 。Class: Name: ( )1. Good morning! !A.Morning ! B.Hello ! C.Hi !( )2. Nice to see you again ! .A.How are you ? B.Nice to see you , too . C.How do you do ?( )3.Good night,mom ! A.Night ! B.Good night ! C.Good evening .( )4.How do you do ? A.How are you ? B.Fine,thanks . C.How do you do ?( )5.How many story books do you have ? A.I have 10. B.I can see 10. C.Thirty yuan.( )6.Do you have new teachers? A.Yes,we do . B.Yes,we dont. C.Yes,we have .( )7.Whos your art teacher ? A.Mr Zhu. B.Miss Zhu. C.Hes tall.( )8.Whats he like? A.Hes tall and strong . B.Yes,he is. C.Mr Zhu.( )9.Is your English teacher young? A.No,she isnt. B.Yes,she is . C.No,she is.( )10. ? Her name is Chen Jie.A.Whats your name ? B.Whats she name ? C.Whats her name ?( )11. ? I like Chinese,math and English.A.What classes do you like? B.What do you like? C.What are you like ?( )12. ? We have English and P.E.A.What do you have on Mondays ? B.What do you have ?C.What do you have on Monday?( )13. ? Its Monday.A.What is it today ? B.What day is it today ? C.What day is today ?( )14. ? I watch TV and do my homework.A.What do you do ? B.What do you do in Mondays? C.What do you do on Sundays ?( )15.May I have a look ? A.Sure.Here you are . B.Look ! C.Here you are .( )16.Our math teacher is Canada.A.from B.in C.at ( )17.I three new teachers.A.has B.am C.have( )18.Whats Chinese teacher like ?A.you B.your C.youre( )19.My P.E.teacher is thin.A.too B.so C.very ( )20.There are days in a week.A.six B.seven C.eight ( )21.There are month(月)in a year(年).A.ten B.eleven C.twelve( )22.I often watch TV Saturday .A.on B.in C.at ( )23.I like P.E. I dont lime music.A.but B.and C.so( )24.This is apple. It is red apple.A.a , a B.an,an C.an, a( )25.What do you like ?A.classes B.class C.classs六年级英语测试题Class: Name: ( )1. How are you ? A.Fine,thanks. B.Yes,it is. C.How are you ?( )2. Nice to meet you ! A.Fine,thank you. B.OK. C.Nice to meet you ,too !( )3. How do you go to school ? A.I go to Canada by plane. B.I go to school by bike. C.What about you ?( )4. How do you go to the USA ? A.I usually go to school by bus. B.I go to England by ship. C.I go by plane.( )5. ? My home is near the post office.A. Where is your home ? B.OK. C.See you then!( )6. See you at 2 oclock. A.See you then ! B.The fifth floor. C.Its easy.( )7. ? You can go by the No.15 bus.A.Its not far. B. How can I get to Zhongshan Park ? C.Sure.( )8. Where is the hospital? A.Next to the cinema. B.Thank you . C.Youre welcome.( )9. Excuse me ,is there a cinema near here ? A.Yes,there is . B.No,its not far. C.Its near the post office.( )10.? ? Its near the post office.A.Yes,there is . B.No,its not far. C. Where is the library? ( )11. ? Its next to the hospital. A. Where is the cinema ,please ? B.Is it far ? C.Go straight.( )12. How can I get to the hospital ? A.Its next to the hospital. B.You can go by the No.201 bus. C.Thank you.( )13.Thank you . A.Thank you . B.OK. C.Youre welcome.( )14. How can I get to the museum? A.Go straight.Then turn left. B.Thank you . C.Its east of the cinema .( )15. Where is the post office ? A.Go straight.Then turn left. B.Thank you . C.Its east of the cinema .( )16. What are you going to do this evening ? A.Im going to the cinema . B.I go to school on foot. C.Yes,it is.( )17. Is it far ? A.No,it is . B.Yes , it is . C.Yes,it isnt.( )18. do you go to school ?A.What B.Where C.How( )19. I go to school bike.A.on B. by C.get( )20. Can I go foot ?A.by B.at C.on( )21.How can I to the post office ?A.near B. get C.for( )22. me.A. Excuse B. How C.next ( )23. birthday to you !A. After B.Happy C.First( )24. The hospital is the left.A. at B.in C.on ( )25. is the bookstore ?A.Where B.How C.When 四年级英语测试题Class: Name: ( )1.Good afternoon ! A.Hello! B.Hi ! C.Afternoon !( )2.Nice to see you again ! A.How are you ? B.Hello ! C.Nice to see you , too.( )3.Good night,moom ! A.Good evening ! B.Good night ! C.Night !( )4.How are you ? A.Fine,thank you . B.I am 10. C.Nine .( )5.How do you do ? A.Fine ,Thank you . B.How are you ? C.How do you do ?( )6.How old are you ? A.How are you ? B.I am 11. C.I have 11.( )7. ? I have 23.A.How many books do you have ? B.How many books can you see?C.How many book do you have ?( )8. ? I can see 6.A.How many lights do you have ? B.How many lights can you see ?C.How many light can you see ?( )9.May I have a look ? A.Sure.Here you are . B.Look! C.Sure.Here are you .( )10. ? 50 yuan. A.How much is this schoolbag ? B.How many is this schoolbag ?C.How much are this schoolbag ?( )11.Wheres my seat ? A.Its near the door. B.Its on the door. C.Its under the door.( )12.Lets clean the desks and chairs. A.All right ! B.Hello ! C.Its nice .( )13.Whats this ? A.There is a board . B.Its a bee. C.Its bee.( )14. ? My name is Mike.A.Here are you ? B.Whats your name ? C.How do you do ?( )15.Whos the inventor of paper ? A.Chinese people. B.Oh! Great ! C.Hello!( )16.I a student. You a teacher.A.am ,am B.are, are C.am, are ( )17.This a boy.His name Zhang Peng.A.is, is B.am , is C.is , are ( )18.Let clean the fish bowl.A.I B. me C.my ( )19.This is apple.It is red apple .A.an ,an B.a, a C.an, a( )20.We a new classroom.A.are B.have C.has( )21.There a bee in our classroom.A. is B.are C.am( )22. have a new schoolbag. schoolbag is heavy.A.I , my B.I ,My C.My , I ( )23.Put your English book your head.A.at B.in C.on (