杨浦补习班五角场恒高一对一2018年小学数学拓展练习

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2018-2019年上海市杨浦区五角场小学一年级下册数学复习题含答案

2018-2019年上海市杨浦区五角场小学一年级下册数学复习题含答案

2018-2019年上海市杨浦区五角场小学一年级下册数学复习题含答案一、想一想,填一填1. 32前面的第三个数是________,30到40之间有________个数。

2. 做冰糖葫芦.3.4. 2年3个月=________个月5. 在67、92、62、89这些数中,最接近90的数是________,比60大又比70小的单数是________,将这四个数从小到大排一排:________< ________<________<________。

6. 填上恰当的数. 1分=________秒 2时=________分75秒=________分________秒 7. 看图回答问题:①小冬跑在最________面,小利跑在最________面。

②小冬在小青的________面,小青在小利的________面。

③小利的前面是________和________。

班级_______________ 座号______ 姓名_______________ 分数__________________________________________________________________________________________________________________8.平行四边形具有________。

9.________个小三角形拼成了。

10.填上“>”、“<”或“=”.(1)180分________3小时(2)40分________1小时(3)6分________30秒二、对号入座、选择填空(含多选)11.妈妈给小明买了38个练习本,现在只剩下13个,小明用了()练习本。

A.26 B.13 C.5112.下面是大月的是()。

A. 6月B. 3月C. 11月13.3角=()分A.1 B.2 C.30 D.314.50个鸡蛋正好装满一盒,如果用这个盒子放苹果,能放多少?()A.比50个少B.正好50个C.比50个多15.小欣和小红一起玩象棋,小欣下了10分钟,小红也下了10分钟,他们一共下了()A. 10分钟 B. 20分钟 C. 30分钟16.70+8-40=()A. 66B. 38C. 58D. 83 17.83+5=()A.58 B.88 C.96 D.7818.下面的数中,十位上的数比个位上的数小5的数是()。

杨浦虹口暑假补习班恒高一对一五角场新概念第二册L32 (S)

杨浦虹口暑假补习班恒高一对一五角场新概念第二册L32 (S)

Lesson 32【New words and expressions】(6)once adv. 曾经,以前temptation n. 诱惑article n. 物品,东西wrap v. 包裹simply adv. 仅仅arrest v. 逮捕★once adj. 曾经, 以前①once = long long ago 很久以前②once 一次I visited my mother once a month. (一次)③once 连接从句,表示“一旦”Once you leave my company, you must return the house.★temptation n 诱惑temptation to do sth. ……的诱惑temptation to steal 偷窃的诱惑resist the temptation to do sth. 抵抗不了……的诱惑resist vt. 抵抗, 反抗, 抗, 忍得住)I can't resist the temptation to laugh.★article n. 物品, 东西①n. 文章This is a good article.②n. 物品, 东西(强调的是商店里的一个一个的东西, 是可数名词, 单独的东西, 独立的个体)thing n. 指任何的东西(和article不可相互取代)cargo n. 船货, (车、船、飞机等运输的)货物goods n. 货物, 商店里的货物的总称★wrap v. 包裹wrap sth. up 把……打包Please wrap them (up) for me. 请替我把他们包好pack v. 打包(指为了携带, 运输的方便而打包)I will take/get/have it. Please wrap them for me. / Please pack them for me.★simply adv. 仅仅simply = only = just★arrest v. 逮捕①vt. 逮捕,扣留When she was arrested, she refused to say anything.The criminal was arrested.criminal n. 罪犯, 犯罪者;adj. 犯罪的, 犯法的, 罪恶的)②n. 逮捕,扣留sb. be under arrest 某人被逮捕Tony is under arrest now.control/under control 控制/被控制③vt. 吸引(注意等)arrest one's attention 吸引某人的注意The beauty of the woods arrested the tourists. 树林的美丽景色吸引了游客。

杨浦恒高一对一五角场补习班小学名师精讲数学题

杨浦恒高一对一五角场补习班小学名师精讲数学题

例1、一个梯形的面积是420平方米,上底是9分米,下底比上底多2分米,那么这个梯形的高是多少分米?LX1、有个占地960平方米的平行四边形摩天轮广场,已知它的高是30米,那么它的底边是多少米?LX2、有个梯形的上底长3米,下底长5米,面积是12平方米,它的高是多少米?例2、广场上要做一个星形形状的花园,由四个相同的三角形组成,中间是正方形。

已知每个三角形的高为5米,面积为9平方米。

那么正方形周长为多少米?LX2、一个长方形周长是122米,长比宽多11米,长和宽各是多少米?它的面积是多少?例3、甲、乙两个化肥厂共生产化肥640吨,甲厂的产量比乙长的3倍多10吨,两厂各生产化肥多少吨?LX1、实验小学四、五年级学生共种向日葵135棵,五年级种的是四年级的1.5倍。

两个年级各种几棵?LX2、五(1)班图书角有连环画和故事书246本,其中故事书的本数是连环画的2倍,连环画和故事书各有多少本?LX3、妈妈和小红5年后的年龄和为52岁,今年妈妈年龄是小红年龄的2.5倍,妈妈和小红今年各几岁?LX4、在一个两位数的末尾添上一个零,所得的三位数比原来的两位数大702.原来这个两位数是几?例4、西安大雁塔比小雁塔高21米,比小雁塔高度的2倍少22米,小雁塔高几米?LX1、有两缸金鱼,第二缸的金鱼条数是第一缸的1.4倍多8条,第二缸的金鱼比第一缸的多24条,两缸金鱼各几条?例5、一群猴子分桃子吃,如果每只猴子吃5个桃子,还剩9个;如果每只猴子吃8个桃子,正好吃完。

这群猴子有几只?一共有多少个桃子?LX1、一批图书分给几个班,如果每班分15本,就多10本;如果每班分17本,图书正好分完。

一共有几个班?这批图书一共有几本?LX2、给小朋友分糖果,每人分3颗,余6颗,如果每人分5颗,正好分完。

小朋友有多少人?糖果一共有多少颗?LX3、五年级同学参加植树,如果每班种16棵,正好种完;如果每班种12棵,还剩下32棵树苗,五年级有几个班?一共有多少棵树苗?。

杨浦暑假补习班五角场新王牌小学奥数专题训练

杨浦暑假补习班五角场新王牌小学奥数专题训练

火车过桥常见题型及解题方法
【随练1】一列火车经过南京长江大桥,大桥长6700米,这列火车长100米,火车每分钟行400米,这列
客车经过长江大桥需要多少分钟?
【随练2】一座铁路桥长1200米,一列火车开过大桥需要75秒,火车开过路旁一信号杆需要15秒,求火车
的速度和车身长
【随练3】已知某铁路桥长960米,一列火车从桥上通过,测得火车从开始上桥到完全下桥共用100秒,
整列火车完全在桥上的时间为60秒,求火车的速度和长度?
【随练4】小明在铁路旁边沿铁路方向的公路上散步,他散步的速度是2米/秒,这时从他后面开过来一列
火车,从车头到车尾经过他身旁共用了21秒.已知火车全长336米,求火车的速度.
火车
火车桥火车行驶路程
课堂检测
火车过桥和火车与人的相遇追及。

杨浦虹口补习班五角场恒高一对一春季词汇复习经典版

杨浦虹口补习班五角场恒高一对一春季词汇复习经典版

高一上词汇复习精简版(Unit 1-2)Unit 1 (新世纪)1. introduction n. 介绍2. professional n. 专业人员4. gain v. 获得5. impact n. 影响;作用8. patient n. 病人11. traditionally adv. 传统上14. style n. 风格;款式15. trend n. 趋势;时尚18. tiring adj. 令人疲劳的19. demanding adj. 要求高的;费力的20. rewarding adj. 值得做的,有意义的21. meaningful adj. 有意义的22. challenging adj. 具有挑战性的24. graduate n. 毕业生;毕业26. career n. 事业,职业27. disagree v. 不同意29. management n. 管理31. grateful adj. 感激的32. compose v. 创作;写作短语1. all walks of life 各行各业2. try one’s best 尽最大努力3. be involved in 参与;忙于4. all through one’s life 一生5. check in 签到6. even though 虽然,尽管7. take an interest in 对..产生兴趣8. make a decision 做决定Unit1 (牛津)2. glance v. 匆匆一看3. sigh v. 叹息4. senior adj. 级别高的7. communicate v. 交流11. impression n. 印象13. assistance n. 帮助14. without hesitation 毫不犹豫15. remark v. 说;评论16. remind v. 提醒18. signal v.表示19. hostility n. 敌意21. confusion n. 困惑22. maintain v. 保持23. consider v. 认为24. lack of 缺少25. last v. 持续26. avoid v. 避免27. respect n. 尊敬28. authority n. 权力30. concentration n. 专心31. subtle adj. 微妙的32. stare v. 盯着;凝视33. rude adj.粗鲁的高一下词汇预览版Unit 1(新世纪)1.determine v. 影响;决定2.rail n. 铁路3.efficient adj. (指人)有能力的;能胜任的4.journey n. (尤指)长途旅行,旅程5.seaport n. 海港;海港市镇6.inland adj. 内地的,内陆的7.waterway n. 水路,航道8.historical adj. 历史的;与历史有关的9.site n. 场所;遗址10.limited adj. 有限的,不多的11.regional adj. 地区的,区域的12.safety n. 安全;平安13.decade n. 十年14.destination n. 目的地15.highway n. 公路,大路16.state n. 国家;政府v. 说明;陈述17.inexpensive adj. 不贵的;廉价的18.depart v. 离开,出发19.cycle v. 骑自行车(或三轮车、摩托车)20.steep adj. 陡峭的;险峻的21.native n. 本地人,本国人adj.出生地的;本国的,本地的22.generally speaking 一般而言23.depend on 依靠;依赖24.on schedule 按时25.agency n. 代理处26.option n. 选择27.sort v. 将...分类;整理28.sort out 解决;从一批中挑出29.province n. 省30.exhibit n. 展览品,陈列品31.shopping mall (有屋顶的)大型购物商场32.one-way ticket 单程票33.round trip 往返旅行34.tour guide 导游35.brochure n. 手册;小册子36.duration n. 期间;持续时间37.approx. adv. (approximately)大约,大概38.spectacular adj. 壮观的;富丽堂皇的39.outing n. 短途旅行;远足40.marine adj. 海的;海产的41.habitat n. 栖息地;产地42.darling adj. & n. 惹人爱的,心爱的43.permanent adj. 永久的44.shark n. 鲨鱼45.aquarium n. 水族馆46.mysterious adj. 神秘的;难解释的47.surround v. 围绕48.entertaining adj. 使人愉快的;有趣的49.jewelry n. 珠宝;首饰50.feature n. 特点;特征v. 以...为主要内容;特写51.workshop n. 车间52.arrange v. 安排53.coach n. 长途汽车54.within arm’s reach 伸手可及的语法填空专题2016年上海崇明区高考英语二模(A)Happiness Is an AttitudeThe 92-year-old confident and proud lady, who is fully dressed each morning by eight o’clock, with her hair fashionably combed and makeup perfectly applied, (25)________ ________ she’s legally blind, moved to a nursing home today.Her husband of 70 years recently passed away, (26)__________ (make) the move necessary.After many hours of waiting patiently in the hall of the nursing home, she (27)_________ (smile) sweetly when told her room was ready. As she got into the elevator (28)__________ her wheelchair, I provided a description of her tiny room.“I love it,” she started with the enthusiasm of (29)__________eight-year-old child having just been presented with a new dog.“Mrs. Jones, you haven’t seen the room…just wait.”“That has (30)_________ to do with it,” she replied. “Happiness is something you decide on ahead of time.(31)_________ I like my room or no t doesn’t depend on how the furniture is arranged…it’s how I arrange my mind. I already decided to love it. It’s a decision I make every morning when I wake up. I have a choice; I can spend the day in bed recounting the difficulty I have with the parts of my body (32)________ no longer work or get out of bed and be thankful for the ones working. Each day is a gift, and (33)______ _____ _____ my eyes open, I’ll focus on the new day and all the happy memories I’ve stored away…just for this time in my life.”(B)Sculptor Builds Dubai’s Soaring Burj Khalifa Skyscraper out of Toothpicks to Bag World RecordA sculptor has scaled new heights by building the world’s tallest toothpick (牙签) model.Stanley Hayes Munro, 45, from Syracuse, New York, is a toothpick engineer, who (34)________ (hook) by toothpick models since he built his first sculpture in school when creating a structure that (35)_________ support the weight of an egg.Now, he has won the world record for the tallest toothpick structure with a sculpture of the Burj Kahlifa, Dubai. For Stanley though, he has always been more concerned with the integrity(完整性) of his work. Stanley said: “I’ve never cared for counting toothpicks, wasting to othpicks, or the number of toothpicks (36)________ (use) in any construction. But an engineering problem you’ve got to create a strong structure is a problem worth (37)__________(solve).” “I made my first toothpick structure in an art class when I was in Grade 5,” he continued. “The assignment was to build something 25 centimeters tall and to have it (38)_________ (hold) the weight of an egg. Mine held my desk and from that point I became interested in it.”“Everybody likes to ask whether my sculptures will collapse when I build them, but they are much (39)__________ (strong) than people think,” he said. “It was not really the height but the shape of the outer walls (40)____________was the biggest challenge with Burj Khalifa. There wasn’t a flat surface anyw here and I had to individually construct each level,” he said.2016年上海奉贤区高考二模`(A)Your next Disney obsession has arrived! Zootopia(疯狂动物城)hit theaters on March 4, and it’s fun at the movies for the entire family. If you’re in the mood to smile, Zootopia is the movie for you. The new Disney movie 25___________ (release) on March 4, starring Jason Bateman, Ginnifer Goodwin, Idris Elba and more. Critics are obsessed 26_________ Zootopia——Check out 27___________ the critics are saying about Zootopia now!---Zootopia is the best Disney animated film that I have seen in a long time. This is a movie that works for everyone. 28__________ doesn't matter whether you're 4 years old or 40 years old.---I love the characters. They do such a great job of building up Judy Hopps(兔子朱迪)from the moment she comes on screen and I think I will remember her as one of my favorite Disney characters.---Zootopia is smart, funny, and is mature in its storytelling and in its message. It’s very nice to see a movie dir ected at kids that has respect and treats kids as people who 29__________ understand complex themes, not mindless creatures that need simple cliched(刻板的)messages.---I predict that Zootopia will be one of the 30__________ (well-known) animated films of the following years. The film does what every animated film should do; it tells a solid story with a lot of emotional depth, and a message that can hopefully teach kids important lessons. The film is also funny, smart, beautifully animated, 31_________ (fill) with great characters, and features great voice work. If you have kids, and they 32________ (not see) this film yet, it’s safe to say they’d enjoy it, b ut they may possibly take an important life lesson away from seeing it too.(B)Leonardo DiCaprio(莱昂纳多·迪卡普里奥)was born in Hollywood. His parents met while 33_________ (attend) college and then moved to Los Angeles. He was named Leonardo because his pregnant mother was looking at a Leonardo da Vinci painting in a museum 34__________ DiCaprio first kicked.He dropped out of high school following his third year, eventually 35_________ (earn) his general equivalency diploma (GED).DiCaprio made his big screen breakthrough in 1992, 36_________ he was chosen by Robert De Niro out of 400 young actors to play the lead role in This Boy's Life.In 1997, DiCaprio starred in James Cameron's Titanic (1997) as twenty-year-old Jack Dawson(泰坦尼克号男主人公). The film became the highest-grossing film to date, and his face appeared on the covers of at least fourteen magazines.DiCaprio was also a dedicated environmentalist. In November 2010, DiCaprio donated $1 million to the Wildlife Conservation Society at Russia's tiger summit. DiCaprio's persistence in reaching the event after encountering two plane delays caused Prime Minister Vladimir Putin 37_________ (describe) him as a "real man".At the 2016 Oscar ceremony, DiCaprio’s 38_________ (win) the award for Best Actor impressed all the audience present. He expressed his appreciation and worry for the environment when he said: Climate change is real, and it is happening right now. It is the most urgent threat 39___________ (face) our entire species, and we need to work collectively together and stop procrastinating(拖延). We need to support leaders around the world who do not speak for the big polluters, but who speak for all of humanity, for the indigenous people of the world, for the billions and billions of underprivileged people out there who would be most affected by this, for our children’s children, and for those people out there 40_________ voices have been drowned out by the politics of greed.(A)“Time,” says the proverb, “is money”. This means that every moment well-spent may put some money into our pockets.If our time (25) __________ (employ) usefully, it will either turn out some useful and important piece of work which will fetch its price in the market, or it will add to our experience and increase our capacities so as to enable us to earn money when the proper opportunity comes. Let those, (26) ___________ think nothing of wasting time, remember this.Our life is nothing more than our time. To kill time is therefore a form of suicide. We are shocked (27) _________ we think of death, and we spare no pains, no trouble, and no expense to preserve life.But we often care nothing about the loss of an hour or of a day, (28) _________ (forget) that our life is the sum total of the days and of the hours we live. Our life is a brief period measuring some seventy or eighty years in all. So a day or an hour (29) __________ (waste) is therefore so much life lost.But nearly one third of this has to be spent in sleep; some years have to be spent over our meals; some in watching over the sick-beds of our (30) __________ (near) relatives; some in making journeys on land and voyages by sea.Now if all these years were to be decreased from the term over which our life extends, we shall find about twenty or thirty years at our disposal (处置) for active work. (31) __________ remembers this can never willingly waste a single moment of his life.The precious hours of childhood and youth, if properly used, (32) _________ (supply) us with incalculable advantages. If we allow these morning hours of life to slip away, we shall never be able to make up for the loss.(B)Home on the WayPeople need homes: children assume their parents’ place as home; boarders call school“home”on weekdays; married couples work together (33) __________ (build) new homes; and travelers...have no place to call“home”, at least for a few nights.So how (34) _________ people who have to travel for extended periods of time? Don’t they have the right to have a home? Of course they do.Some regular travelers take their own belongings: like bed sheets, toothbrushes and family photos to make them feel like home (35) ______ ______ ______ they are; some stay for long periods in the same hotel and as a result become very familiar with service and attendants; others (36) __________ simply put some flowers by the hotel window to make things more homely. Furthermore, driving a camping car during one’s travels and sleeping in the vehicle at night is just like (37) __________ is generally thought of as “home” -- only mobile!And how about maintaining relationships while in transit? Some keep contact with their friends via internet; some send letters and postcards, or even photos; (38) __________ may just call and say hi, just to let their friends know that they’re still alive and well. People find ways to keep in touch. (39) __________ (make) friends on the way helps travelers feel more or less at home. Backpackers in youth hostels may become very good friends, even closer than siblings.Nowadays, fewer people are working in their local towns, so how do they develop a sense of belonging? Whenever we step out of our local boundaries, there is always another “home” waiting to be found. Wherever we are, with just a little bit of effort and imagination, we can make (40) _________ place where we stay “home”.(A)GarlicGarlic, a common seasoning found in many different types of food, has a long medical and mythical history. References to garlic (25)___________(find) in Chinese texts that are dated as far back as 3000 BC. The physician Hippocrates used garlic in ancient Greece (26)_________(treat) infections and physical disorders. In many parts of ancient world, garlic was thought to avoid unfriendly spirits, treat wounds (27)_______ ________ _______ protect against disease.Roman soldiers believed that garlic brought them courage and energy. They took it with them when they went into battle. Egyptians fed garlic to their servants when they built pyramids. They thought that it gave the workers strength. They also believed that garlic had magical and medicinal powers. In the Middle Ages, people thought that garlic prevented the plague(瘟疫).People have praised the virtues of garlic for centuries. Garlic’s popularity began to decline in the early years of the twentieth century, but its reputation (28)_________(restore) in recent years. It is now a valuable cash crop in the state of California. Nearly a half-billion pounds of garlic are produced there each year. The city of Gilroy, California, considers (29)_________ the garlic capital of the world. Each year, the city hosts the Gilroy Garlic Festival in honor of the crop.Some doctors are studying garlic’s effects as a defense (30)_________ some forms of cancer. Others are exploring its possibilities for treating arthritis. Garlic has also received praise for its ability to lower high levels of cholesterol(胆固醇).(31)_________ some of the medicinal benefits of garlic have yet to be proven, it is certain(32)_________ many people enjoy the flavour that it adds to food.(B)The illegal sale and use of drugsDespite the respect of most Americans for law and the determination of the legal system to protect the rights of individuals, the United States, like all other countries, does experience crime. Especially in large cities, the crime rate (33)_______ be high.A high percentage of crime in the United States is directly related to the illegal sale and use of drugs. Drugs are smuggled into the country by (34)________(organize) groups despite intense efforts by the government to stop the illegal drug trade. Drug abuse in the U.S. has come to be regarded as one of (35)________(challenging) social problems facing the nation. The drug issue always excites strong emotions of American (36)_________ drug abuse is regarded as a major threat to American society, particularly to its younger members. Drug abuse is a social problem as it has (37)_________ wide range of social costs. For example, drug is closely related with crime, automobile accidents. Those (38)__________ become addicted to drug use sometimes rob or break into houses or stores to steal money to pay for the drugs. It has serious effects on individuals physically and mentally, (39)_________ the economic losses caused by drug abuse are great.Drug use has caused great concern in the United States. The federal government has worked hard to stop the (40)___________(grow) of drug plants in other countries. It has also set up special agencies, sometimes working with agencies from other nations, to catch the smugglers outside and inside the United States. Teachers and many citizens work together to teach children about the dangers of drug use. Many government agencies in the states and private citizen groups work to help drug addicts give up their drug use and turn to useful lives.听力专题之长对话(17二模:普陀;松江)Questions 17 through 20 are based on the following conversation.17. A. His view on Canadian universities.B. His understanding of higher education.C. His suggestions for improvements in higher education.D. His complaint about inequality in American universities.18. A. It is well designed.B. It is rather inflexible.C. It varies among universities.D. It has undergone great changes.19. A. The United States and Canada can learn from each other.B. Public universities are often superior to private universities.C. Everyone should be given equal access to higher education.D. Private schools work more efficiently than public institutions.20. A. University systems vary from country to country.B. Efficiency is essential to university management.C. It is hard to say which is better, a public university or a private one.D. Many private universities in the US are actually large organizations.松江Questions 17 through 20 are based on the following conversation.17. A. Beautiful scenery in the countryside. B. Cross-country skiing.C. Dangers of winter sports.D. Pain and pleasure in sports.18. A. He can’t find good examples to illustrate his point.B. He can’t find a peaceful place to do the assignment.C. He can’t decide whether to include the effort part of skiing.D. He doesn’t know how to describe the beautiful country scenery.19. A. New ideas come up as you write.B. Much time is spent on collecting data.C. It’s hard to find a proper topic.D. The writer’s point of view often changes.20. A. How to revise a paper in an academic manner.B. How to polish your arguments in a paper.C. How to tell the main ideas in a paper effectively.D. How to decide on relevant content for a paper.Questions 17 to 20 are based on the following conversation.W: Hello,I’m here with Tom. Now Tom, you went to university in Canada?M:Yeah, that's right.W:OK, and you have very strong views about universities in Canada. Could you please explain?M:Well, we don't have private universities in Canada. They're all public. All the universities are owned by n the government, so there is the Ministry of Education in charge of creating the curriculum for the universities and so there is not much room f or flexibility. Since it’s a government operated institution, things don’t move very efficiently.W:Oh, it's really beyond my expectation.M:Yes, however, there are certain advantages of public universities, such as the fees being free. You don’t have to pay for your education. But the system isn't efficient, and it does not work that well.W:Yeah, I can see your point. But in the United States we have many private universities, and I think there are a lot of rules also. Maybe people don't act that much differently, because it's the same thing working for a private university. They get paid for their job. I don't know if they're that much more motivated to help people. Also, we have a problem in the United States that usually only wealthy kids go to the best schools, and it's kind of a problem actually.M:I agree with you. I think it's a problem because you’re not giving equal access to education to everybody. It's not easy, but having only public universities also might not be the best solution. Perhaps we can learn from Japan where they have a system of private and public universities. Now,in Japan, public universities are considered to be the best.W:Right. It's the exact opposite in the United States.M: So, as you see,it’s very hard to say which one is better.W:Right, a good point. .Questions17. What does the woman want Tom to talk about?18. What does the man say about the curriculum in Canadian universities?19. On what point do the speakers agree?20. What conclusion does the man draw at the end of the conversation?Questions 17through 20 are based on the following conversation.M: Hello, Professor Jones.W: Hello, Tony. So what shall we work on today?M: Well, the problem is that this writing assignment isn’t coming out right. What I thought I was writing on was to talk about what a particular sport means to me—one I take part in.W: What sport did you choose?M: I decided to write about cross-country skiing.W: What are you going to say about skiing?M: That’s the problem. I thought I would write about how peaceful it is to be out in the country.W: So why is that a problem?M: As I start describing how quiet it is to be out in the woods, I keep mentioning how much effort it takes to keep going. Cross-country skiing isn’t as easy as some people think. It takes a lot of energy. But that’s not part of my paper, so I guess I should leave it out. But now I don’t know how to explain that feeling of peacefulness without explaining how hard you have to work for it. It all fits together. It’s not like just sitting down somewhere and watching the clouds rolling by. That’s different.W: Then you’ll have to include that in your point. The peacefulness of cross-country skiing is the kind you earn by effort. Why leave that out? Part of your point you knew beforehand, but part you discovered as you wrote. That’s common, right?M: Yeah, I guess so...(Listen again, please)Questions17. What is the topic of the man’s writing assignment?18. What problem does the man have while working on his paper?19. What does the woman say is common in writing papers?20. What is the conversation mainly about?秋季新王牌小班课赵N1 12月9日:高一(学生版)四大模块(词汇;语法专练;听力;写作)11 / 11写作题目:你是张华,你要竞选班长(class president),请写一篇竞选演讲词演讲词中应包括:1. 你为何认为自己可以胜任班长工作?2. 如果当选你将会为本班同学做什么?实战练习To begin with, one of my 1._____ is leadership, which plays a vital role 2._____ managing the whole class. Having had a 3._____ in leading a class, I am sure to lead the class to 4._____. Moreover, a sense of responsibility makes me 5._____ from other candidates. I’ll accomplish most class tasks 6._____with my responsibility. Last but not least, the ability to 7.______ will 8._______ class affairs. Along with such ability, I will be able to 9.______.2. 翻译填空:将括号内的中文翻译成英语,使得句子通顺(1)A._______(我坚信) that I will have the courage to B.______(处理大量工作) and turn our class into a wonderful, friendly and warm unit that is C._______(不亚于任何班级)A. I firmly hold the belief;B. deal with a great amount of work;C. second to none(2)If I am A.____(很幸运地赢得你们的支持) and get the post, I will do my best to B._____(尽好我的义务) and C._______(承担起作为领导者的角色) in our class.A. fortunate/lucky enough to win your support;B. fulfill my obligations;C. assume my role as a leader (3)I will make sure about A.______(自修时间的纪律和安静),providing the class with B.______(一个更好的学习气氛).A. the discipline and quietness of the self-study periods;B. a better studying atmosphere(4)Firstly, I will A.______(用尽任何方法) to build up the bridge between teachers and students in order toB._______(激发学习氛围).A. try every/all means;B. inspire the studying atmosphere3. 英译汉:用恰当的中文表达下列句子的意思(1)I’m sure that under my leadership, you will see a class running in a vigorous and harmonious way.(2)Since I hold several essential qualities equal to this position, I am quite confident that voting for me will be your wise choice.(3)In a word, I will do my best to fulfill the requirements of the position. Please trust me and lend me a hand so that I can serve everybody heart and soul.。

杨浦虹口补习班五角场恒高一对一特征类答题思路总结

杨浦虹口补习班五角场恒高一对一特征类答题思路总结

特征类答题思路总结一、依据区域等高线图说明当地地形特征(1)分析思路(2)答题要点在进行判读的基础之上应从以下三点进行说明:①说明地形类型有哪些,以哪种地形类型为主。

②说明地势起伏的趋势,表达时必须使用方位术语,如“地势东高西低”,“地势由东南向西北升高”。

③说明地势高差的大小。

若在沿海地区,有时还要说明海岸线的特点是平直还是弯曲。

有无特殊地貌,如岩溶地貌、花岗岩风化地貌等。

(3)规范术语的地形图(单位:米)。

读图,分析甲、乙两图所示区域的地形特征。

二、气候特征分析1、地带性气候,归纳如下2、非地带性气候,归纳如下:(4)根据地理环境的整体性原理分析气候对区域自然地理环境及人类活动的影响,见下图:三、关于河流的三种问题的分析思路(1)河流水文或水系特征的描述,其分析思路为:(2)河流水文或水系特征的成因分析,其分析思路为:(3)两河流水文或水系特征的差异比较,其分析思路为:2.影响因素分析(1)河流水文特征分析(2)河流水系特征分析四、根据河流特征判断当地地理环境特征1.根据河流流向、水系、水文特征判断地形特征(1)根据河流流向可推知地势高低,河流总是由高处流向低处,河源地区地势高,河口地区地势低。

(2)根据河流水系分布判断地形类型向心状水系→盆地,如四川盆地、刚果盆地。

放射状水系→山地、高原,如海南岛、青藏高原。

(3)根据流速判断地形坡度流速快→河谷坡度大,反之坡度小。

2.根据河流水文特征判断当地地理环境特征(1)含沙量大小可反映出流域内植被状况含沙量小→流域的植被覆盖率高,反之低。

有时含沙量小也可能是因为上游修建了水库。

(2)河流结冰期可反映冬季气温的高低无结冰期→冬季气温在0℃以上;反之,在0℃以下。

如我国北方和南方地区。

(3)河流春汛明显,可反映当地冬季积雪多,可能在我国东北、俄罗斯、加拿大、北欧等地区。

(4)河流水量较小且受气温影响较大,反映该河流主要补给水源为冰雪融水。

3.根据河流的河床宽度可判断地形(1)若河流河床较宽,则说明该河流经平原地区。

杨浦虹口暑假补习班恒高一对一五角场说明文阅读

杨浦虹口暑假补习班恒高一对一五角场说明文阅读

主题:说明文阅读精讲中国皮影戏①皮影戏,是一种用灯光照射兽皮或纸板做成的人物剪影以表演故事的民间戏剧。

表演时,一般由三到五个艺人在白色幕布后面,一边操纵戏曲人物,一边用当地流行的曲调唱述故事,同时配以打击乐器和弦乐。

②中国皮影戏有着悠久的历史。

两千多年前,汉武帝爱妃李夫人染疾故去,武帝思念心切,神情恍惚,终日不理朝政。

术士李少翁一日出门,路遇孩童手拿布娃娃玩耍,影子倒映于地,栩栩如生。

李少翁心中一动,用棉帛裁成李夫人影像,涂上色彩,并在手脚处装上木杆。

入夜围方帷,张灯烛,恭请武帝端坐帐中观看。

武帝看罢龙颜大悦。

这个载入《汉书》的爱情故事,被认为是皮影戏最早的渊源。

③表演皮影戏要先制作皮影。

其制作过程是:先将羊皮、驴皮或其他兽皮的毛、血去净,经药物处理,使皮革变薄,呈半透明状,涂上桐油,然后把皮革镂刻成所需的人物形象。

皮人的头、四肢、躯干等各自独立,而又用线连成一体,分别以连杠由演员操纵,令其活动。

④皮人涂有各种颜色,表达人物的善恶美丑。

绘画也有一定的讲究,女性发饰及衣饰多以凤、花、草、云等纹样为图案,男性则多用龙、虎、水、云等纹样。

人物造型与戏剧人物一样,生、旦、净、丑角色齐全,制成的皮影高的达55厘米,低的仅有10厘米左右。

⑤皮影戏表演时,由三五个艺人在白色幕布后面,一边操纵戏曲人物,一边用当地流行的曲调唱述故事,同时配以打击乐和弦乐。

表演民间神话、武打、古代故事时,人物可以腾云驾雾,做出各种高难动作。

这是其他戏剧难以做到的,因此深受观众喜爱。

皮影戏在宋代已极为盛行,到明代,北京一带的皮影戏班竟达到四五十家。

⑥皮影戏是一门结合了戏剧、音乐等多种艺术表现手段的表演形式,它有着悠久历史,也是最早传入西方的中国传统艺术之一。

⑦公元13世纪,当时的蒙古军营中也演皮影戏,后来皮影戏被随军带到波斯、土耳其等国。

之后,又在东南亚各国流传开来。

中国皮影戏18世纪中叶传到欧洲。

1767年,法国传教士把它带回法国,并在巴黎、马赛演出,被称为“中国灯影”,曾轰动一时。

杨浦五角场最优补习班恒高教育考点诠释

杨浦五角场最优补习班恒高教育考点诠释

【考点诠释】一、考查以that与which引导的定语从句1.通常只能用that的情况1)当先行词是不定代词a11,few,little,much,something,anything,nothing,everything 等时。

2)先行词被序数词、形容词的最高级以及被a11,any,every,each,few,little,no,some,the only.the very.the last等修饰时。

3)如果先行词既指人又指物,应用关系代词that。

【考例】Without friendship, one can't be happy although he is rich enough. As for me, I will never forget the days __ I spent with my dearest friend. [哈尔滨市]A. thatB. whenC. who[答案]A。

[解析]在定语从句中,引导词who(指人)which(指物)that(指人或物)。

由先行词the days作spent的宾语可判定用that引导。

2.通常只用which的情况(1)引导非限定性定语从句,用关系代词which指代前面整个句子的内容。

(2)引导非限定性定语从句,而且先行词指物时只能用which,不用that。

(3)如果句中有两个定语从句,如果两个从句都可以用that引导,那么其中一个应改用which 引导。

【考例】Many young people love the songs _________have great lyrics. [成都市]A. whoB. thoseC. which[答案]C。

[解析]考查定语从句。

定语从句的引导词有which,who,where,that,故排除B,who指人,又排除了A,先行词是物,故选C。

二、考查以who,whom与whose引导的定语从句(1)如果先行词是指人的不定代词anyone,anybody,everyone,everybody,someone,somebody,nobody,one,ones,those,all(指人)等作先行词,作主语用who,作宾语用whom。

杨浦补习班五角场恒高一对一高中语法专项练习

杨浦补习班五角场恒高一对一高中语法专项练习

语法填空What should you take in with you when you take an exam? Pen, pencil, eraser, ruler … and don’t forget a bottle of water!According to a study held in London, students ___25___(bring) water into exams may improve their grades by up to 10%.Scientists in UK did the study on 448 students. The students were studying for a different degree at the University of East London. Only 25% of them entered the exam hall with water. Scientists then compared their exam results with their normal schoolwork grades. They found that all those who ___26___(bring)water with them got better grades by 2% to10%.Scientists also predicted the students’ scores according to their normal schoolwork. They wrote down their possible scores on paper ___27___the students took exams.It is unclear ___28___ drinking water improves exam results. But scientists say having enough water in our bodies and not feeling thirsty could have a helpful effect on our brains. Drinking water may also reduce anxiety,___29____ has a bad effect on exam performances.“___30____the explanation is, it is clear that students ___31___try hard to stay hydrated (含水的) with water during exams,” one of the scientists said.So next time, when you are going to have a big exam, try __32___ (furnish) yourself with a bottle of water. It may help you pass the exam!(B)Without any previous notice, a documentary dominated headlines and social websites over the weekend.Under the Dome, a 103-minute documentary___33___(self-fund) by former news anchor Chai Jing, ___34___(release) in China on Feb 28. It has rapidly pushed the public awareness about air pollution and encouraged people to join in ___35___effort to make a difference.Chai, 39, said she started the work out of her “personal clashes” with smog after she gave birth to a daughter. “I sealed tight all the windows.I started every day by checking the air pollution index,” Chai said. Millions of other people are doing the same. While they stop there, Chai goes much ___36___ (deep). “I don't want to l ive in this way. I need to find out where the smog comes from and what on earth is going on”Chai's research reveals that it is the burning of coal and oil ___37___contributes to 60 percent of PM2.5 pollutants. She then goes on to disclose loopholes in car emissions regulations. Some of the laws have been in place for years, ___38___ have never been applied. The film also explains that businesses are pressured not to obey the law because violating them carries little or no cost, while making changes pushes up costs. The film also points at China's petroleum and steel industries ___39___the biggest sources of air pollution.Chai goes on to list the things ordinary people can do___40___ (help) and sums everything up by calling for individual responsibility in reporting illegal emissions via the hotline 12369.普陀(A)Good ideas often start with really silly questions. Bill Bowerman was making breakfast one day. As hestood there making waffles(华夫饼干) for his son, he wondered what would happen if he poured rubber (25)________ his waffle iron. Later, he tried it and the result looked something like the bottom of most sports shoes we see today. Still, when he took this idea to several existing shoe companies, he was laughed at. In fact, every single company turned him down. Though rather discouraged, Bowerman persevered and went on (26)________ (form) his own company, making NIKE athletic shoes.Sometimes good ideas grow out of frustration. When Fred Smith was a student at Yale University, he needed to have some paperwork (27)________(deliver) across the country the next day. Smith was amazed to find out that overnight delivery was impossible. He sat for a long while (28)_________ (wonder) why. Why couldn’t there be a reliable overnight mail delivery service? He d ecided to design one. Smith did just that and turned his design into (29)_________ class project. His business professor gave him only a C for his efforts. However, Smith was not through. He improved the ideas in that class project and eventually turned (30)_________ into one of the first and (31)__________ (successful) overnight mail services in the world—FedEx.We know today, of course, that each of these ideas led to an incredibly successful product or service (32)_________ has changed the way many of us live. The best questions are usually open-ended and are often silly. Children aren’t afraid to ask such questions, but adults frequently are. Think how different the world might be (33)_________ people never asked “silly” question!(B)A lot of people in the world today are used to working, going on holiday, and having money—but many of them aren’t happy. Yet other people seem to be really happy,(34)____ ____ they are poor, or have no job, or are surrounded by problems. Why?Professor Mihaly, from the University of Chicago, has interviewed thousands of people who have a happy life to find out how they do it. “I (35)________ (study) happiness for over 30 years,” says Mihaly. “My interest in the subject came from my own experience as a child during World War II, when I saw many adults destroyed by the terrible events. But there were always a few who kept their courage, helped others, and were able to give a sense of purpose and meaning to their lives. I wanted to find out how a person (36)_______ build a fulfilling and enjoyable life.”In general, his research showed that people were unhappy doing nothing. The professor stresses that happy people don’t waste time, either at work or when they’re free. “Many people feel the time that they sp end at work or at school wasted. But often their free time (37)________ (waste) as well. Many people are used to doing passive things—watching television, for example—without (38)_________ (use) any skills. As a result, life goes past in a series of boring experiences.”But it doesn’t have to be this way. The professor has found that people are happy when they get into (39)_________ he calls “flow”. When people get very involved in a task that they have chosen, and which is well-defined and challenging, the y experience “flow”, a situation (40)_________ they don’t notice time passing.People who are not used to happiness can learn how to be happy, says the professor, if they constantly get into “flow” states. Is happiness as easy as that? Perhaps it is.。

杨浦暑假补习班五角场新王牌补习班课后巩固一课一练

杨浦暑假补习班五角场新王牌补习班课后巩固一课一练

一课一练【练习1】在校运动会上,学学和思思同时赛跑,学学每分钟跑20米,思思每分钟跑25米,5分钟后,他们相距多少米?【练习2】李明和王亮同时分别从两地骑车相向而行,李明每小时行18千米,王亮每小时行16千米,两人相遇时距全程中点3千米.问全程长多少千米?【练习3】六年级同学从学校出发到公园春游,每分钟走72米,15分钟以后,学校有急事要通知学生,派李老师骑自行车从学校出发9分钟追上同学们,李老师每分钟要行多少米才可以准时追上同学们?【练习4】慢车以每小时45千米的速度从甲地开往乙地,3小时后快车以每小时60千米的速度也从甲地开往乙地。

问:多少小时后快车追上慢车?【练习5】蜡笔小新从家出发去超市找妈妈,小新妈妈从超市回家,他们同时出发,小新每分钟走45米,小新妈妈每分钟走65米,他们在离中点60米的地方相遇了,求小新家到超市的距离是多少米?【练习6】解放军某部先遣队,从营地出发,以每小时6千米的速度向某地前进,12小时后,部队有急事,派通讯员骑摩托车以每小时78千米的速度前去联络,问多少时间后,通讯员能赶上先遣队?【练习7】一架敌机侵犯我领空,我机立即起飞迎击若两机相距48千米时,敌机扭转机头以每分钟14千米的速度逃跑,我机以每分钟20千米的速度追击,当追上敌机时我机飞行了多少千米?【练习8】甲以每小时4千米的速度步行去学校,乙比甲晚4小时骑自行车从同一地点出发去追甲,乙每小时行12千米,乙几小时可追上甲?【练习9】妹妹以每分钟50米的速度从家出发去学校,哥哥发现妹妹忘记带学具盒,于是哥哥骑自行车以每分钟200米的速度从家出发追赶妹妹,12分钟后追上妹妹。

妹妹比哥哥早出发多少分钟?【练习10】小明以每分钟50米的速度从学校步行回家,12分钟后小强从学校出发骑自行车去追小明,结果在距学校1000米处追上小明,求小强骑自行车的速度?。

杨浦虹口暑假补习班恒高一对一五角场物理总复习

杨浦虹口暑假补习班恒高一对一五角场物理总复习

第十七讲初二上学期总复习三一、选择题(每小题2分,共24分)1.一只苹果的质量约为()A.0.015千克B.0.15千克C.1.5千克D.15千克2.提琴表演时,演奏者用较大的力拨动琴弦是为调节琴声的()A.响度 B.音调 C.音色 D.音质3.足球运动员用脚将足球踢到空中后,足球在空气中受到的力(空气对足球的作用力忽略不计)及力的施力物体分别是()A.踢力、脚 B.踢力和重力、脚和地球C.重力和踢力、脚和地球 D.重力、地球4.一束光从水里斜射入空气中,若入射角是30°,则折射角可能是()A.0°B.15° C.30° D.40°5.耳朵卫生在现代社会越来越重要,特别是在噪声大的环境下,应该()A.大声讲话,排除外部声音的影响B.用棉球塞住耳朵C.把汽车上的音响声音开大些,外面的噪音干扰就小了D.把随身听的音量开到最大6.下列不属于三原色的色光是()A.红光 B.黄光 C.蓝光 D.绿光7.在狭小的房间内,墙壁上挂上一面大平面镜,看上去会产生空间增大的感觉,这主要是应用平面镜能够()A.改变光路B.使物与像的距离是物与镜的距离的2倍C.成正立像的特点D.以上原因都不是8.一物体在水平方向上受到两个大小分别为2牛和4牛的力,则这两个力的合力大小()A.一定是2牛B.一定是6牛C.可能是8牛D.可能是6牛9.甲、乙两车都做匀速直线运动,在下列几种情况中,甲车比乙车运动得快的是()A.甲通过得路程为4000米,乙通过的路程为2000米B.甲通过的路程为1000米的同时,乙通过的路程为1500米C.甲在半小时内通过的路程为40千米,乙在10小时内通过的路程为300千米D.甲的速度为30千米/时,乙的速度为10米/秒10.凸透镜的焦距为10厘米,一物体放在距该凸透镜焦点5厘米的主光轴上,则该物体通过透镜一定成()A.正立的像B.倒立的像C.缩小的像D.放大的像11.某同学用打点计时器打出了甲、乙两条纸带,如图(a)所示.他画出了相应的s﹣t图象A、B图线,如图(b)所示.则下列判断正确的是()A.甲纸带对应是A B.乙纸带对应是AC.甲纸带对应的运动要快些D.甲纸对应的运动时间要短些12.如果没有重力,下列现象中不会出现的是()A.灰尘扬起后不会落回地面B.人轻轻一跳就会跳过非常远的距离C.宇航员在宇宙飞船中用餐时,汤水倒不进嘴里D.手压海绵,海绵不会形变二、填空题(每空1分,共29分)13.测量的目的就是为进行可靠的比较,首先要有一个公认的比较标准,叫做,还要选用合适的测量工具.测量所能达到的准确程度是由测量工具的决定的.14.物体所含的多少叫做质量.一杯质量为0.5千克的水,放入冰箱后结成冰,质量为千克,所以质量是物体的一种.15.如图所示,喇叭不发声时,纸盆上的泡沫塑料静止不动,而当喇叭发声时,纸盆上的泡沫塑料活蹦乱跳,这个现象说明:发声的物体都在.将耳朵帖在桌面上,用铅笔在桌面的另一处轻敲,能听到声音,说明(选填“固体”、“液体”或“气体”)也能传递声波.能判断某位同学的说话声,是根据声音的(选填“响度”、“音调”或“音色”)不同来判断的.但是,宇航员在太空中只能依靠无线电通话,这是因为声音不能在中传播.16.如图为某学校学生正在开展“每天一小时”校园体育活动的情景.其中,图(a)排球被传出的同时,手臂感到疼痛,表明物体间力的作用是的;图(b)中间的同学用力蹬地可以跃起,主要表明力可以改变物体的;长绳弯曲,主要表明力可以改变物体的.17.近年来,长三角地区高铁网络的发展,给人们的出行带来极大便利,促进了城市间的交流.一列以252千米/时的速度匀速驶向杭州的高铁列车,以铁轨为参照物,高铁列车是的.上海距杭州约200千米,乘坐该高铁列车大约小时可以从上海到达杭州.上海的地铁列车最高速度为25米/秒,两者速度之比为.18.九寨沟的“镜海”有着“鱼在天上飞,鸟在水中游”的美景奇观.这里看到水中的“云”和“鸟”,其中“云”是由于光的所成的像(选填“虚”或“实”);“鱼”是由于光的而成的像(选填“虚”或“实”).19.地球表面附近的物体,由于而受到的力叫做重力.重力与质量的关系式为.式中的g= ,读作.它表示.20.如图(a)所示,将一根原长为L0的弹簧一端固定在墙面上,分别用大小或方向不同的力作用在弹簧的另一端,实验现象如图(b)、(c)、(d)、(e)所示.(1)分析比较图可知,当力的大小和作用点相同时,力的方向不同,力的作用效果不同.(2)分析比较图(c)和(d)可知,当力的大小和相同时,力的不同,力的作用效果不同.(3)分析比较图(b)和(c)可知,.三、作图题(共11分)21.在图中,画出反射光线OB的入射光线AO,并标出入射角及其大小.22.根据平面镜成像特点,在图中画出物体AB在平面镜中所成的像A′B′.23.重为20牛的物体静止在水平地面上,用力的图示法在如图中画出它所受的重力G.24.根据图(a)和(b)中光通过透镜前后的方向,在图中填上适当类型的透镜.四、计算题(共16分)25.长200米的列车,以36千米/小时的速度通过一个长为700米的山洞.列车从车头进山洞到整列车全部驶离山洞,需要多长时间?26.如图为某大桥的限重标志,表示对过桥车辆的质量限制.若有一辆集装箱卡车总重力为2.45×105牛,该卡车能否通过该桥?27.一只羽毛球球的重力为0.05牛,它在空中飞行时受到的空气阻力始终与运动方向相反,大小恒为0.02牛.(1)若小球竖直向上运动,如图(a)所示,求此时它所受合力的大小及方向.(2)若小球竖直向下运动,如图(b)所示,求此时它所受合力的大小及方向.五、实验题(共20分)29.在“探究平面镜成像的特点”实验中,为确定像的位置,实验时采用作为平面镜,并将其放置在水平桌面上,然后可在图中的位置观察(选填“A”或“B”)所成的像.30.在“用弹簧测力计测力”的实验中,小明填写的实验报告(部分)如下,请填写空格处的内容.实验目的:.实验器材:细线、弹簧测力计、钩码、木块.实验步骤:1.完成弹簧测力计的.2、在弹簧测力计的挂钩上悬挂一个合适的钩码如图所示,则弹簧测力计的示数 F1= 牛.…31.如图所示为“验证凸透镜成像规律”实验的情景,所用透镜焦距为10厘米.(1)图中,A是,B是.(2)调试实验装置时,应使烛焰的中心和凸透镜、光屏的中心大致在上,目的是为了.(3)图示情景验证的是凸透镜成像的特点(填写像的性质).(4)如果还要验证凸透镜成倒立放大实像的特点,在不移动凸透镜的情况下,应把蜡烛移到厘米处(选填“小于30”、“30~40”或“40~50”),光屏移到厘米处(选填“大于70”、“60~70”或“50~60”).32.某小组同学在“用弹簧测力计测力”的实验中发现水平拉动物体时拉力的大小与某些因素有关,并决定继续进行探究实验.实验发现拉力大小和接触面大小无关.然后他们继续研究水平拉力和其他因素的关系,他们将质量不同的物块分别放置在水平的木板和橡胶板上,并用弹簧测力计沿水平方向匀速拉动物块,表一木板表二橡胶板(1)分析比较实验序号1与4或2与5或3与6的数据及相关条件,可得出的初步结论是:沿水平方向匀速拉动相同的物体,接触面的材料不同,拉力的大小.(2)分析比较实验序号1与2与3或4与5与6的数据及相关条件,可得出的初步结论是:在同一水平面上,沿水平方向匀速拉动物体,.(3)该小组在进行此探究实验时,采用的是的科学方法.【课堂达标检测】一.选择题(每小题2分,28分)1.人体每天需补充八杯水,这八杯水的体积最接近于()A.1.5吨B.1.5毫克C.1.5千克D.1.5升2.关于声现象,下列说法中正确的是()A.“闻其声而知其人”主要是根据声音的响度来判断的B.用声波能粉碎人体内的“小石头”,说明声波具有能量.C.敲锣时用力越大,声音的音调越高D.市区内某些路段“禁鸣喇叭”,这是在声音传播的过程中减弱噪声3.下列说法中正确的是()A.在太阳系中只能说“地球绕太阳转动”,不能说“太阳绕地球转动”B.宇宙是由运动着的物质组成的,自然界不存在绝对静止的物体C.一幢房子造好后,固定的地面的位置不变,所以它是绝对静止的D.汽车驶过一座桥梁,只能说“汽车是运动的”,而不能说“桥梁是运动的”4.甲乙两物体都做匀速直线运动,已知甲乙两物体运动时间之比5:4,通过的路程之比2:3,则甲乙两物体运动速度之比为()A.5:6 B.8:15 C.6:5 D.15:85.下列说法中正确的是()A.物体发生形变,一定受到力的作用B.物体受到力的作用,运动状态一定发生改变C.物体改变运动方向不需要力的作用D.力的作用只能使物体运动状态发生改变6.将重为G的苹果竖直向上抛出,若苹果在空中所受的阻力小于苹果的重力,则苹果在空中运动的过程中受到的合力方向()A.可能竖直向下 B.一定竖直向下 C.可能竖直向上 D.一定竖直向上7.许多家庭的门上都装有防盗门镜(俗称“猫眼”).从室内透过防盗门镜向外看,可以看到来客的正立、缩小的像.由此可以断定,此时防盗门镜的作用相当于一个()A.凸透镜B.凹透镜C.三棱镜D.玻璃砖8.托盘天平的横梁上有标尺和游码,移动游码的作用是()A.调节天平水平 B.调节横粱平衡C.相当于向左盘上加小砝码D.相当于在右盘上加小砝码9.蜡烛放在离凸透镜40cm的主光轴时,在透镜另一侧的光屏上得到清晰放大的像.若把蜡烛在原来位置向远离透镜方向移动40cm,则所成清晰的像一定是()A.虚像 B.放大的C.正立的D.缩小的10.如图所示,F1、F2是凸透镜的焦点,AB是放在凸透镜前的物体,A’B’是AB经凸透镜所成的像.下列四个图中,其中关于AB所的成像情况正确图是()A.B.C.D.11.某人站在河边看到水中的鱼在云中游,他所看到的()A.云是光的反射所成的虚像B.云是光的折射所成的虚像C.鱼是光的折射所成的实象D.鱼是光的反射所成的实像12.“不要在公共场所大声喧哗”是一种文明行为,这句话提醒人们在公共场所讲话时,要注意控制自己讲话声音的()A.响度 B.音调 C.音色 D.语速13.一个凸透镜的焦距为10厘米.当物体沿主光轴从距透镜15厘米处向30厘米处移动时,那么()A.像变小,像距变小 B.像变大,像距变大C.像先变小后变大,像距变大 D.像先变小后变大,像距变小14.如图中(a)和(b)是甲、乙两辆小车运动时的s﹣t图象.请根据图象判断,下列正确的描述是()A.甲通过的路程是乙通过路程的2倍B.甲所需的时间是乙所需时间的一半C.甲的速度是乙的速度的2倍D.甲的速度是乙的速度的4倍二.填空题(每空1分,28分)15.国际单位制中,长度的主单位是.测量长度的基本工具是,如图所示,物体的长度是mm.16.如图所示,利用打点计时器,甲、乙两条纸带分别记录了甲、乙两个物体的运动情况.(1)打点计时器的振针每秒上下振动次,每振动一次的时间间隔为秒.(2)在甲纸带上点1和点之4间的时间间隔t14与点5和点7之间的时间间隔t57相比较,t14t57(选填“大于”、“等于”或“小于”).(3)在乙纸带上c点到g点的时间为秒.17.单位换算:(1)无线电波在1秒内通过的距离是3×105千米,合米.(2)课本面积约540厘米2= 米2.(3)900克的水凝固成冰,则冰的质量为千克.(4)一天为24小时,24小时秒.18.校运动会上,甲.乙.丙三人分别进行了100米和200米的赛跑,成绩如下表所示,则:在100米赛跑中获得第一名的是同学,在200米赛跑中获得第一名的是同学,这里比较三人赛跑快慢采用最简便的方法是.若要比较甲同学在100米和200米赛跑中的快慢,可以采用的方法是.19.在地球表面物体所受的重力与质量成关系.一物体的质量为2.5千克,则该物体受到的重力为牛,在计算过程中,g=9.8牛/千克,所表示的物理意义是.20.如图所示,MN是介质A和B的分界面,其中之一是空气,一束光从介质A入射到介质B,折射角为度,空气是介质(填“A”或“B”)21.小李在利用照相机拍摄东方明珠电视塔的全景时,发现不能将整个电视塔照全.则根据学过的光学知识分析,小李他要拍摄东方明珠电视塔的全景.他的做法是将照相机向电视塔方向移动,而底片向镜头方向移动.(均选填“靠近”,“远离”)22.”满眼风光多闪灼,看山恰似走来迎,仔细看山山不动,是船行”.其中”满眼风光多闪灼,看山恰似走来迎”是以为参照物;”仔细看山山不动,是船行”则是以为参照物,研究的运动.23.“用光具盘研究光的反射现象”的实验中,各小组同学都完成了各自的实验报告.以下是从不同实验报告中摘录出来的四句话:①反射光线与入射光线分别位于法线的两侧;③反射角等于入射角;④保持入射点位置不变,当入射光线靠近法线时,反射光线也向法线靠近.这四句话中,属于现象的是;属于结论的是.(均选填序号)24.小黄和小杨为了研究物体的运动状态的变化和物体在同一直线上所受合力之间的关系.做了如下实验,她们先让小车在光滑的水平桌面上向右作匀速直线运动,过程中设法用弹簧测力计在水平方向上分别向左、右对小车施加拉力.拉力和小车的运动状态分别如图6的A、B、C、D所示,请根据实验现象和相关条件,归纳得出结论.(1)由A、B两图可知:.(2)由C、D两图可知:.三.作图题25.如图所示,根据入射光线的方向,画出经透镜折射后的光线.26.如图所示,AB为物体,MN为平面镜,试根据平面镜成像的特点,画出AB在平面镜中的像A′B′.27.如图所示,画出物体AB经凸透镜折射以后所成像的大概位置及像的性质.28.如图所示,吊在天花板上的电灯保持静止状态,其中电线受到的拉力为0.4牛.请用力的图示画出电灯受到的重力.四.计算题29.月面巡视探测器(月球车)是集工程和智能机器人为一体的复杂航天器,具备地﹣﹣月遥控能力,有独立驱动的六轮摇臂式行走系统,高1.5米,质量为120千克.求:(1)月球车在地球上受到的重力.(2)在地球上重6牛的物体放到月球上时重为1牛,那么月球车被送到月球上时的质量和受到的重力分别是多少?(g取10牛/千克)30.在修建高速公路的采石场,炸药的导火索的点燃速度是0.6厘米/秒.引爆员点燃一上4.8分米的导火索后,他以多大速度跑开才能到达400米以外的安全区?31.某铁路大桥全长9600米,其中位于江面上的正桥长3.6千米,一列长为0.4千米的火车匀速行驶,通过正桥要200秒.求:(1)火车的速度;(2)火车通过大桥所用的时间.五.实验题32.在“用天平测质量”的实验中,先要把移到零刻度处,通过调节平衡螺母使其在位置平衡;然后在盘放被测物体,另一盘中放砝码,并适当移动游码使天平再次平衡,此时砝码和游码如图1所示,则所测物体的质量为克.图2中的弹簧测力计的最小刻度值是牛,测量范围是牛.此时弹簧测力计的读数是牛.33.在“研究平面镜成像实验”中,为了能准确地确定平面镜所成像的位置,如图所示在桌上竖立一块当作平面镜,在它的前面放一支的蜡烛,在它的后面放一支的蜡烛,直到从前面看上去像点燃的一样,这就是烛焰的像.34.在“研究凸透镜成像规律”实验中,要调整烛焰的中心、凸透镜的中心、光屏的中心在.在图1中,凸透镜焦距为10厘米.保持透镜位置不变,当蜡烛在35厘米刻度处时,为了找到像的位置,光屏应在光具座的厘米刻度范围内移动(选填“60~70”或“大于70”);在光屏上所成烛焰的像应该是图2中的图(选填序号).35.一宇航员用托盘天平和弹簧测力计研究物体在地球上和月球上受到的重力和物体质量的关系,他得到如表一和表二所示的数据:表一:在地球上表二:在月球上(1)分析比较实验序号1、2、3(或4、5、6)中重力与质量的倍数关系,可以归纳出的初步结论是:.(2)分析比较的数据后,可以归纳出的初步结论是:质量相同的物体在地球上受到的重力比在月球上受到的重力大.(3)进一步综合分析比较表一、表二最后一列重力与质量的比值关系:①比较表一或表二可得出的结论是:;②比较表一和表二可得出的结论是:.。

杨浦五角场补习班恒高一对一小学三年级数学期末测试

杨浦五角场补习班恒高一对一小学三年级数学期末测试

三年级数学期末测试(完卷时间:60分钟)一、计算部分:44%1、直接写出得数12%45×70=1000-850 =100÷50×2=13×25÷13×4=77÷11 =810÷90 =18+82×2=100-100÷10=400÷16=539÷9=(39-18)×30=()÷18=20 (7)2、列竖式计算(打※的题要验算)10%(1、2小题3分,第3题4分)640×106 =58×39=※7103÷35 =3、递等式计算(能巧算的要巧算)18%4612-306-94 138×26+74×138 3304÷(681-625)8×46×125 760÷38×120 2586-(586+447)4、列式计算:4%(1)2个86的积乘10,结果是多少?(2)86与59的差去除27,商是多少?二、应用部分:33% (1—5题各6分,第6题3分)1、一个长方形操场,长是50米,宽比长少10米,小明每天跑一圈,他跑了多少米?2、一台电扇的价格是92元,一台空调的价格比一台电扇价格的42倍还多26元,一台空调的价格是多少?3、在“献爱心”活动中,四年级捐款1980元,比五年级少140元,一、二、三年级共捐款数是四、五年级的一半,一、二、三年级共捐款多少元?4、学校购买桌椅,第一次买了120套,第二次买同样的桌椅145套,第二次比第一次多付2625元,每套桌椅的价钱是多少元?5、一列火车早上5时从甲地开往乙地,按原计划每小时行驶120千米,下午3时到达乙地,但实际到达时间是下午5时整,晚点2小时。

问火车实际每小时行驶多少千米?6、列算式求图形的周长(单位:厘米)三、概念部分23%1、填空15%(1)1002m =( )2dm 12km4m =( )m(2)175×□,要使这个算式的积的末尾有两个0,□里最小可填( )。

杨浦虹口初中补习班恒高一对一五角场预初小儿辩日

杨浦虹口初中补习班恒高一对一五角场预初小儿辩日

预初语文练习十二望岳一、默写1、本诗作者是_____代伟大的现实主义诗人_____,字________,自号“______________”,诗风沉郁顿挫,忧国忧民,他的诗被称为“________”二、赏析7、下面对诗的理解分析,错误的一项是()A.这首诗是现存杜诗中年代最早的一首,字里行间洋溢着杜甫蓬蓬勃勃的朝气。

B.全诗没有一个“望”字,但句句写向岳而望。

C.颔联写近望所见泰山的神奇秀丽和巍峨高大的形象。

D.诗的前六句在“望”字上下功夫,后两句是诗人登上泰山后的感受。

8、对这首诗理解不恰当的一项是()A.诗的每一联都有“望”的意思,但“望”的角度不同。

B.这首诗描写了泰山的神奇景色,抒发作者仰慕赞叹之情以及企望攀登绝顶的心情。

C.“会当凌绝顶,一览众山小。

”这是化用了孔子的名言“登泰山而小天下”。

D.“造化钟神秀,阴阳割昏晓。

”是写远观泰山神奇秀丽、巍然耸立的形象。

9、赏析有误的一项是()A诗人由实望泰山而产生登临意愿,于是想象登临泰山绝顶的景象和心理感受。

B诗的第二句,作者没有用笔墨去勾勒泰山是多么高大,而是写泰山占地多么广大以距离广远衬托山势高峻,用笔不凡。

C第三句中的“造化”是运气、福气的意思,这句是说神奇秀美都聚集在此,实为泰山的运气。

D全诗格调高亢,尤其是七、八两句表现了诗人勇攀高峰、俯视一切的雄心和气概,读来催人奋进。

(杜甫青年时期所写,描写泰山雄伟磅礴的气象,抒发自己勇于攀登、俯视一切的雄心壮志。

第一句设问,表现迫不及待的探胜之情,第二句作答,昔日敬慕之情如泉涌。

“造化”大自然,“钟”聚集,“钟”字将大自然写的有情,“割”字给人泰山如刀的感觉,写出泰山的险峻崎岖,高与天齐。

“荡胸。

,归鸟”写黄昏时的山景。

前六句写泰山景色,突出泰山的气势,流露出对祖国河山的热爱。

最后两句画龙点睛,产生登岳的豪情,表现诗人意欲登上泰山之巅,睥睨天下的豪情壮志。

“望”为线索,由远而近,虚实相生,情景交融。

杨浦暑假补习班恒高一对一梯形的面积

杨浦暑假补习班恒高一对一梯形的面积

1、梯形的概念只有一组对边互相平行的四边形叫梯形2、梯形各部分的名称在梯形里,互相平行的一组对边分别叫做梯形的上底和下底(较短的是上底,较长的是下底),不平行的一组对边叫做梯形的腰。

从上底上一点向下底画垂线,这点和垂足之间的线段叫做梯形的高。

123、直角梯形和等腰梯形有一个角是直角的梯形叫做直角梯形。

两腰相等的梯形叫做等腰梯形。

4、如何正确区分平行四边形和梯形的概念平行四边形和梯形相同的地方都是四边形,不同之处是平行四边形要两组对边分别平行,而梯形是一组对边平行,另一组对边不平行,即梯形是只有一组对边平行。

5、梯形面积计算公式S=(a+b )h ÷2 h=2S ÷(a+b ) a=2S ÷h-b b=2S ÷h-a【精解名题】例1、填空1、用一条两边互相平行的透明色带与一个三角形可以交叠出一个。

2、在梯形中,相互平行的一组对边,分别叫做梯形的 和 ; 不平行的一组对边叫做梯形的3、下图中,梯形的上底是 ,下底是 ,高是 ,AB 和CD 都是梯形的4、从上底上一点向下画 ,这点和垂足之间的线段,叫做梯形的5、有一个角是 的梯形叫做直角梯形6、两腰相等的梯形叫做 梯形3一、判断1、梯形只有两条高…………………………………………………………………( )2、梯形的下底一定比上底长………………………………………………………( )3、只有一组对边平行的图形叫做梯形……………………………………………( )4、梯形是轴对称图形………………………………………………………………( )5、在直角梯形中,一共有两个直角………………………………………………( )6、等腰梯形的高就是它的对称轴…………………………………………………( )7、两个梯形只要面积相等,就可以拼成一个平行四边形………………………( )8、一个梯形的高有无数条…………………………………………………………( ) 二、选择1、右图中阴影部分是A.长方形B.平行四边形C.梯形D. 无法确定2、下列图形中,只有一条对称轴的是A. 平行四边形B. 正方形C. 等边三角形D. 等腰梯形3、只有一组对边平行的四边形是A. 平行四边形B. 正方形C. 长方形D. 梯形4、有两个完全相同的梯形可以拼出一个A.三角形B. 正方形C. 长方形D. 平行四边形例2、分别画出下面梯形的高1、分别画出下面梯形指定的高过点A作梯形的高过点B作梯形的高过点C作梯形的高过点D作梯形的高452、画出下面梯形的高,量一量梯形的上底、下底和高上底 上底下底 下底高 高梯形2梯形面积公式的推导。

杨浦五角场恒高一对一补习班小学写作提升与拓展

杨浦五角场恒高一对一补习班小学写作提升与拓展

童年趣事【习作要求】童年我们经历了种种趣事,时时想到都倍感温馨,请以“童年趣事”为题,写一篇记叙文。

不少于300字。

想一想,你小时候都玩过什么有趣的事情呢?过家家?用沙子堆堡垒?在这些事情中,应该有很多有趣可爱的事情。

【审题和选材】●确定范围:●找准题眼:●确定体裁:(换牙、给猫刮胡子、给鱼晒太阳、把小狗放进洗衣机洗澡、把菜放在洗衣机里面洗、带小鸡睡觉……)你小时候做的最有趣的事情是什么?【同类题目链接】一件有趣的事/那一次,我真开心/一件好笑的事/给我印象深刻的一件事……【构思提纲】回忆一下当时有哪些人物出现,说了什么话,做了什么,你又想了什么,人物的表情是什么样子的。

根据“六要素”把作文写完整,用描写方法把作文写具体,用好词好句把作文写生动。

【素材库】精彩开头:●童年是一本书,记录我们的点点滴滴;童年是一首歌,唱出我们的酸甜苦辣;童年是一幅画,渲染出了我们五彩缤纷的故事。

●有一件事在脑海不可磨灭,至今想起来记忆犹新。

精彩结尾:●童年,令人怀念的童年,天真无邪,令我在无忧无虑中走过了。

童年啊童年,有了你,使我一生更加精彩!●这个故事是不是很有趣啊?现在想起来我还忍不住哈哈大笑呢!词语超市:天真无邪酸甜苦辣五彩缤纷全神贯注小心翼翼兴高采烈洋洋得意出乎意料异想天开后悔莫及记忆犹新不可磨灭和蔼可亲大显身手心花怒放无忧无虑【范文赏析】童年趣事快乐的童年像雨后的彩虹一般,缤纷绚丽,曾经做过的许多有趣的事就像一颗颗明亮的小星星在童年的天空中闪烁。

偶尔自己或别人提起来就引来一阵欢笑。

下面我就给你说一件我小时侯非常有趣的事。

那是我刚过完五岁生日的一年夏天,妈妈送给我一个大气球,上面画着可爱的多啦A梦。

只要你轻轻向天空一扔,它就会轻飘飘地飞到半空,然后落下来,十分有趣。

我总在小朋友面前炫耀它。

一天,刚下过大雨,我家院子里积起许多小水潭,我见雨停了,就跑到院里抛气球玩。

气球在空中打着旋,我一边追逐,一边喊:“真好玩!真好看!”忽然气球落在了一个小水潭里。

杨浦虹口五角场最好的初中数学补习班恒高一对一角的关系

杨浦虹口五角场最好的初中数学补习班恒高一对一角的关系

『课堂练习』1.选择:
(1)两个三角形的两条边及其中一条边的对角对应相等,则下列四个命题中,真命题的个数是()个
①这两个三角形全等; ②相等的角为锐角时全等
③相等的角为钝角对全等; ④相等的角为直角时全等
A.0 B.1 C.2 D.3
(2)在下列定理中假命题是()
A.一个等腰三角形必能分成两个全等的直角三角形
B.一个直角三角形必能分成两个等腰三角形
C.两个全等的直角三角形必能拼成一个等腰三角形
D.两个等腰三角形必能拼成一个直角三角形
(3)如图,Rt△ABC中,∠B=90°,∠ACB=60°,延长BC到D,使CD=AC则AC:BD=()A.1:1 B.3:1 C.4:1 D.2:3
(4)如图,在Rt△ABC中,∠ACB=90°,CD、CE,分别是斜边AB上的高与中线,CF是∠ACB的平分线。

则∠1与∠2的关系是()
A.∠1<∠2 B.∠1=∠2; C.∠1>∠2 D.不能确定
(5)在直角三角形ABC中,若∠C=90°,D是BC边上的一点,且AD=2CD,则∠ADB的度数是()
A.30°B.60°C.120°D.150°
(6)(黄岛)下列条件中,能判定两个直角三角形全等的是()
A.一锐角对应相等B.两锐角对应相等
C.一条边对应相等D.两条直角边对应相等。

杨浦小升初补习班五角场新王牌小学数学四则运算专题练习

杨浦小升初补习班五角场新王牌小学数学四则运算专题练习

01四则运算一、能力提升。

1.填空。

(1一个数被33除,商8,余数最大是(,此时被除数是(。

(2在○里填入“>”、“<”或“=”。

25×8+20×8○25+20×8 (13-4×6○13×6-13×4(3756780089是(位数,用四舍五入法凑整到十万是(。

(4250+(÷30×2=2622.递等式计算,能巧算的要巧算。

(1120÷20×6+120 (245×98 (328×72+32×72(442+6×12-4 (5160×48+520×16 (648×29+13×16(79999×8+4444×7 (820162017×20172016-20162016×20172017 3.列式计算。

(1320减去171与79的和,得出的差再乘7,积是多少?(2200减去100的差,被2与5的积除,商是多少?4.下面的□里可以填哪些数字?(写出所有答案(119□785≈20万(260□907≈60万(39□8765≈1000000(四舍五入到十万位(49□4765≈900000(四舍五入到十万位5.填上加减乘除或括号,使下列等式成立。

(两种不同的填法1 2 3 4 5 = 101 2 3 4 5 = 106.添加(或[ ],使等式成立:3+3÷3-3×3=36+6-6×6÷6=612×12-12+12÷12=1225×25-25÷25+25=257.计算1+2-3-4+5+6-7-8+9+10-…+20178.应用题。

(12010年上海世博会于5月1日开始,并于10月31日结束。

请问此次世博会共持续了多长时间?(2一个长方形水池,宽30米,长比宽的4倍还多5米,这个水池的面积是多少?(3有两袋糖,第一袋有66块,第二袋有18块。

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2018年秋季四年级数学(1)姓名
【乘除法巧算1】
知识点:
1、掌握巧算中经常要用到的一些运算定律,如乘法交换律、结合律、分配律
2、将数进行重新组合,灵活运用运算定律
要点:乘法中常用的几个重要式子
2×5=10;4×25=100;8×125=1000;4×75=300;4×125=500;
乘法的几个重要法则
1、去括号和添括号原则
在只有乘除运算的算式里,如果括号的前面是“÷”,那么不论是去掉括号或添上括号,括号里面运算符号都要改变,即“×”号变“÷”,“÷”变“×”;如果括号的前面是“×”,那么不论是去掉括号或添上括号,括号里面运算符号都不改变。

例题. ① a×(b÷c) =a×b÷c ②a÷(b÷c) =a÷b×c
2、带符号“搬家”
在只有乘除运算的算式里,每个数前面的运算符号是这个数的符号。

不论数移动到哪个位置,它前面的运算符号不变。

(1)乘法交换律a×b=b×a
(2)乘法结合律a×(b×c)=(a×b) ×c
(3)乘法分配律a×(b+c)=a×b+a×c;a×(b-c)=a×b-a×c
(4)逆用乘法分配律a×b+a×c =a×(b+c);a×b-a×c=a×(b-c)
例1:计算:72×53+41×24
这个算式是乘积之和的形式,但没有相同的因数。

仔细看看72和24有什么联系?
把72分解成24×3后就出现相同的因数了,然后运用乘法分配律简化运算。

练习:
(1)24×56+48×22 (2)360×72+36×280
(3)423×75+423×25 (4)9999×2222+3333×3334
例2:543×36+117×36+660×64
师:这个算式是乘积之和的形式,但只有2个相同的因数36。

所以先前两部分进行巧算543×36+117×36+660×64
=660×36+660×64
=660×100
=66000
练习:(1)54×16-15×16-39×6 (2)316×48-340×28+24×48 (3)23×57+9×77-48×23
【乘除法巧算2】
要点:掌握巧算中经常要用到的除法的几个运算法则。

除法的几个重要法则
(1)商不变性质
被除数和除数乘以(或除以)同一个非零的数,商不变,即
a÷b=(a×n)÷(b×n)(n≠0)
a÷b=(a÷m)÷(b÷m)(m≠0)
(2)当n个数都除以同一个数后再加减时,可以将它们先加减之后再除以这个数;反之也成立。

如:(a±b)÷c=a÷c±b÷c;a÷c±b÷c =(a±b)÷c
例1. 乘除同级运算的去括号法则
(1)25×(4×43)(2)45000÷(25×90)(3)562×397÷(281×397)练习:(1)5600÷(1400÷4)(2)125×(8×37)
例2. 乘除同级运算的加括号法则
(1)31000÷8÷125 (2)1320×500÷250
练习:(1)37500÷4÷25 (2)61000÷125÷8 (3)35×222÷111
例3.利用商不变的性质进行巧算
21000÷125
练习:(1)110÷5 (2)44000÷125 (3)47700÷900
例4.利用除法性质进行巧算
(1)(99+88)÷11 (2)25÷13+14÷13
练习:(1)13÷9+5÷9 (2)21÷5-6÷5 (3)(12+24+36+48)÷6
拓展题:
例1:不用笔算,请你指出下面哪道题得数最大,并说明理由.
241×249 242×248 243×247 244×246 245×245 练一练:.比较568×764 和567×765 哪个积大?
例2:比较下面两个积的大小:
A=987654321×123456789
B=987654322×123456788
练一练:. 有两个算式:①98765×98769,
②98766×98768,
请先不要计算出结果,用最简单的方法很快比较出哪个得数大,大多少?。

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