pep五年级下册英语课

pep五年级下册英语课（通用7篇）

1.pep五年级下册英语课 篇一

Unit 1 This Is My Day

Language systems:

1. Lexis: 有关描述一天中的生活起居以及周末活动的语言.

2.Grammar: 有关询问别人一天中的生活起居以及周末活动的句型如：When do you …? 和What do you do on the weekend?的提问和回答。

3.function: 学会描述一天中的生活起居以及周末活动的语言.

4.phonology: 字母组合ai/ay在单词中发【ei】以及gr、gl的发音训练。同时在教授新单词和let’s chant时渗透一些发音规律。

Language skills:

1. Listening: 听懂一些描述人物特征的单句、对话和一段完整的语篇，根据关键信息完成一些相应的听力练习。

2. speaking:能和他人交谈自已一天中的生活起居以及周末活动的一些情况。

3. reading:读懂对话或短文，培养一些基本的阅读技能，如何快速查找关键信息，根据上下文猜词等。

4. writing:规范书写四会单词和句子，并能根据图片和提示语写一段话描述一天中的生活起居以及周末活动的情况，养成良好的书写习惯和写作习惯。

Objectives:

1. 能力目标

(1) 能够使用频度副词问答作息时间,如:When do you do morning exercises? I usually do morning exercises at 8:30.

(2) 能够使用频度副词问答周末活动,如:What do you do on the weekend? I often go shopping.

(3) 能够听说读写与日常作息有关的动词及介词短语,如:eat

2.pep五年级下册英语课 篇二

教学目的

1.能听懂会说并在实际情况中运用以下对话:Who′s your Math/English……teacher ?

Mr Zhao/..What′s he/she like? He ′s /She′s thin and short .And she′s very kind.

2.能够正确使用Mr, Miss, Mrs, 对西方人的称呼有进一步了解。

教学准备

1.各科教师的图片或能代表各学科特点的图片或能表示人物特征的图片。

2.学科教师调查表学生每人一份。

教学过程

1.Warm-up/Revision

(1) T:Hello, everyone! Nice to see you again!Now , first Let′s review some words.

Young/funny/tall/strong/kind/old/short/thin. (要求学生根据图片认读单词)

(2) Let′s chant.

T:Now Let′s chant together. (Play the tape)

教师出示表格如下:

T:Thank you for your chanting. Now Let′s look at the form..What′s the math teacher like?

Ss: He′s smart. (Then the teachers fills “smart” in it. And then the teacher asks the similar questions

And fill in the form just like this

T:Would you like to chant again?Looking at the form.

【设计意图】第一遍让学生跟着录音唱, 第二遍唱之前通过问答的形式把关键信息填入事先准备好的学科教师调查表内, 再让学生看着表的内容唱, 渗透培养学生收集信息的能力。

(3) 教师风采

T:Sounds great! But Who′s your math teacher?What′s he like?Can you fill in the form by yourself

【设计意图】引导学生描述自己的老师, 先请学生集体口头来表达, 再引导学生填写表格, 同时可以检测上节课单词的掌握情况, 请学生4人一组进行交流, 渗透语言技能的培养, 同时也可以扩大语言训练面。

2.Presentation

(1) Let′s try.

教师出示A Let′s try部分的挂图。

T:Please look at this pictures .How many people are there?What′s he like? (Ask some students to

Talk about this picture)

【设计意图】在做听力题之前, 引导学生观察相应插图, 通过几个问题来描述图画内容, 从而猜测出题意图, 渗透听力技能的培养。

T: Now, Let′s listen and please circle on your books.

(2) Let′s talk

①T:Now Let′s go on listening , please listen to the tape and answer my questions:

Who′s Chen Jie′s math teacher? What′s he like?

②the students answer the questions.

板书设计:Unit1 A-Let′s talk

Who′s your math teacher? Mr Zhao.

What′s he like? Thin, short, 【kind】

③the students listen again and read after the tape .

④学生齐读, 分小组读, 同桌读对话. (学生看板书背诵对话)

⑤教师Present the pictures of teachers引导学生make a dialogue,

⑥学生2人一组编对话, 根据插图替换对话内容.

【设计意图】从Let′s try直接过渡到Let′s talk的教学, 通过听音回答问题的方式出示对话的关键词, 请学生齐读.分小组读, 同桌读, 这是适当的机械性操练, 是学生灵活运用语言点的基础.以方便学生快速掌握对话和替换对话, 同时也是在逐步进行学法指导。

3.Practice/Consolidation

Magic Match Game

教师准备三组图片, 分别为能表示人物特征的图片, 姓氏类 (用Mr.Miss.Mrs加姓氏表示) 。

人物特征类 (smart, strong……) 请三位同学各抽取一张图片后出示给全班同学看, 请全班同学提问, 这三位同学回答。

【设计意图】这部分是语言的操练部分, 根据同学们熟悉的真实人物的图片来进行这游戏, 更具有挑战性和趣味性, 能激发学生的兴趣。

4.Assessment

从学生的作业本中, 准备一个听力练习, 以检测学生对本堂课语言点的掌握程度.

5.Homework

①Please listen to the tape (A-Let′s talk) 3 times.

②Design a card for your favourite teacher, draw a picture of him or her.

③Get ready to describe your card in class.

3.PEP小学英语五年级上册 篇三

1.知识目标:①能听说认读单词flower,river ,grass,lake ,forest, path,sky ,cloud, mountain等九个单词. 

②能听说读写前六个单词.

2.能力目标:能通过句型操练和具体设置的场景进行口语交流。

3.情感目标:通过介绍各地美景培养学生热爱祖国,热爱大自然的情怀。

二、教学重点

四会单词的学习以及在句型There is /are…中的操练。

三、教学难点

grass, forest,path,以及mountain的发音。

四、教学准备

录音机,卡片,课件,导游旗。

五、教学过程

(一)Warm-up:

1. Free talk

T:Hi ! boys and girls. Stand up,please.

Good morning, everyone!

T:How are you today?

T:Nice to meet you!

T: Do you like singing songs?

T: Let’s sing a song : Bingo.(播放录音唱)

T:Sit down,please.

T:Now,Group1,2,3,4,5.Let’s climb up the mountain. If you can pass the words, the sentences and the paragraphs, you are the winners. Let’s have some competitions. OK?Ss:OK!

(二)Presentation:

1. T:Now,please look at the pictures.What are these? ( 课件: 风景名胜) 

T:Yes,they are beautiful places.Do you want to go there to have a look?

Now,look,who am I?(Teacher拿上旅游旗)

T:Yes,I’m Miss Guide. Would you like to go and see the beautiful places with me?

Ss:Yes!

T: OK! Let’s go! Look. Where are we? ( 课件: 自然公园)

T: Yes , We are in a Nature Park.

2. 课件:T:nature park教读nature park

逐一展示内容,出现单词,教读

T:Look! What can you see?

T:It’s a river.教读单词卡。读,齐读,开火车或抽读。

T:River,river,there is a river.

T:Now,What else can you see?

T: Grass,grass,there is some grass.

齐读,大小声读,抽读。

T: Well, There is apath . Can you see it now?

教读,指导口形读音,齐读,小组比赛读。

画面。湖。

T:Look,What’s this?Is this a river?

Ss:No.

T:It’s a … .教读,lake, lake. I can see a lake. There is a lake. big lake , small lake教读,抽读。

画面:许多树木形成的森林。

T:Now,many trees are here.There is a forest now. 

There is a forest in the nature park.

教forest.

分组读,男女生读,抽读。

T:(师拿出花 闻)Mm, how fragrant! What’s this?拿出卡片学生读。Flower.抽读,齐读。

T:再现大山,白云,天空,教读mountain,cloud,sky.

这三个单词都读得好的组给予奖励。

(三)Consolidation:

① T:Now, boys and girls. Let’s play games.

T:Look at my cards carefully, 

Guess.What’s missing?

② Picking apples.

课件T: If you can read the word, please pick the apple and read the word. Or: He or she point at the word, you please read it out.师示范,请生点一个读一个。评比。

③ Find friends: 

Look at the pictures and the words, match them please.(所有單词都会的组前进一步)

④ Sentences: Now, boys and girls, look at another pictures. Try to say some sentences with the new words.

提示学生说There is a __________.(然后请生自由说句子, 注意用 There is/ are … or I can see…句式)

⑤ Chant 

T: Now , look at the screen, there is a chant. Listen to it carefully, then say it with me.

Flower, flower, there are some flowers.

River , river , there is a river .

Lake , lake , there is a lake.

Grass , grass , there’s some grass.

Forest, forest, there is a forest.

Path , path , there is a path. 

(四)Extension:

1. 小组活动(1)Page 70, Part 2 Compare with Picture 1, what difference in Picture A/B /C? Now, let’s see who has the fiery eyes?

Find out the differences:

Discuss in your group. 生说 There is a _____ in Picture A /B….

课件检测。

2. 口头作文:

T: Congratulations! Let’s go on. Now,look ! Where are we now? Yes ! We are in Jiangjin now.(师提示,引导读。) 

课件: 

There is a big river along our city. It's the Yangtze River. 

There is a Binjiang road by the river . There are many flowers , trees and some grass on it. There is a path to Aiping Mountain.

Marshal Nie Rongzhen said:"Jiangjin is a good place."

Welcome to our city -Jiangjin.

Well, boys and girls. Do you want to be a guide, and show everybody around the beautiful places in the world?OK! Have a try ,please.(请生来当小导游)

Take out your pictures,say something about your pictures in your group.请生说,评价,奖励

T:Congratulations.You did fairly well . All of you are the winners.

Congratulations.Claps!

Well,so much for today .Thank you .

Please turn back and say:“Thank you . Goodbye!”

板书设计:

PEP Book 5 Unit 6 In a Nature Park Part

A Let’s learn

river grass path lake forest

flower mountain cloud sky

There is a / an ….

4.PEP_五年级下册英语作文辅导 篇四

My School Day

We go to school from Monday to Friday.Usually I get up at 6:30 in the morning.I eat breakfast at 7:00.We have six classes a day.I often go home at 5:30, then I do homework.I go to bed at 10:00.2.以My Weekend 为题，介绍你平时周末在家都干些什么，要求语句通顺，约40---50词。

My Weekend(例1)

There are two days on the weekend,Saturday and Sunday.On Saturday,I often play sports in the morning and do my homework in the afternoon.On Sunday, I often visit grandparents in the morning and read books in the afternoon.I usually have a good time on the weekend.My Weekend(例2)

Hi, I’m Mike.I’m a student.I often go hiking on Saturdays.I climb mountains on Sundays.Sometimes I go shopping.I like my weekend.3.结合自己家乡的特点，写一篇短文：My favourite season

My favourite season(例1)

There are four seasons in a year.They’re spring, summer, fall and winter.I like fall best.It’s sunny and cool.The sky is very blue and high.It’s always windy.We can go to fly kites.There are many fruits in fall.Fall is a good season.My favourite season（例2）

My favourite season is summer.It’s hot in summer.I often swim in the river.It can make me healthy and strong.I can wear my pretty dresses.4.你的生日在什么时候，是什么季节？在生日的时候你经常做什么？吃什么？心情怎样？

My birthday

Hi , I’m Amy.My birthday is in June.It’s in summer.I usually go shopping on my birthday.I eat birthday cake and eggs.I’m very happy.5.Amy打电话想找Mike，但Mike正在听音乐，是Mike的爸爸接电话。后来爸爸叫Mike听电话。Amy约Mike明天下午两点去图书馆。根据提示，编写对话。提示：tomorrow 明天library 图书馆

Father:Hello!1234567.Amy:Hellol.This is Amy.Can I speak to Mike, please?

Father: Sure.Please hold on.He’s listening to music.Mike, there’s a call for you.Mike:Thank you, dad.Hello, who’s that?

Amy:This is Amy.Do you want to the library tomorrow?

Mike:Yes.What tiem?

Amy:At 2:00 in the afternoon.Mke:OK.See you tomorrow.Amy:See you.6、想象作文。动物们正在森林里开运动会：小鸟们比谁飞得快；袋鼠在跳高；小兔和乌龟在赛跑；猴子和熊猫在爬树；鸭子在游泳；大象和狗熊在比谁走得快。老虎和狮子却在一边打起架来了！根据以上提示，发挥你的想象，写一篇短文。提示：运动会 sports meeting乌龟 tortoise

Today there’s a sports meeting in the forest.The birds are flying.Kangaroos are jumping.The rabbits and tortoise are running.Who can run fast? Rabbits or tortoise? The ducks are swimming.Look!Monkeys and pandas are climbing trees.The elephants and bears are walking.Oh, no!The tigers and lions are fighting!

7、A Field Trip

Our class will have a trip today.Look!Amy is watching insects.Mike is collecting leaves.Wang Yiming and Wang Yifan are having a picnic.We have a good time.1、以My School Day 为题，介绍你平时上学的一天。

My School Day

We go to school from Monday to Friday.Usually I get up at 6:30 in the morning.I eat breakfast at 7:00.We have six classes a day.I often go home at 5:30, then I do homework.I go to bed at 10:00.2、以My Weekend 为题，介绍你平时周末在家都干些什么，要求语句通顺，约40---50词。

My Weekend(例1)

There are two days on the weekend,Saturday and Sunday.On Saturday,I often play sports in the morning and do my homework in the afternoon.On Sunday, I often visit grandparents in the morning and read books in the afternoon.I usually have a good time on the weekend.My Weekend(例2)

Hi, I’m Mike.I’m a student.I often go hiking on Saturdays.I climb mountains on Sundays.Sometimes I go shopping.I like my weekend.4、你的生日在什么时候，是什么季节？在生日的时候你经常做什么？吃什么？心情怎样？

My birthday

Hi , I’m Amy.My birthday is in June.It’s in summer.I usually go shopping on my birthday.I eat birthday cake and eggs.I’m very happy.7、A Field Trip

5.pep五年级下册英语课 篇五

2.C 3.C 点拨: 说某一种语言用 speak。

4.A 5.C 6.B 7.C 点拨: 一般情况下，一般疑问句中 some 变 any。

8.C 9.B 10.C 点拨: books 是复数形式，these 指代前面出现的 books，故选 C。

四、1.washes 2.birds 3.shopping 4.first 5.Amy＇s 6.her 7.running 8.some 9.Chinese 10.does 五、1.D 2.A 3.E 4.C 5.B 六、1.often watches TV 2.I＇m playing football at five o＇clock.3.What are they doing? They are eating lunch.4.My birthday is on February the twenty­ninth.七、1.We finish class at four o＇clock.2.The cute dogs are theirs.3.When is the maths test? 4.The monkeys are playing with a ball.八、1.This eraser is hers.2.Whose red pictures are they? 3.No, she isn＇t.4.He is drinking water.5.Do you always finish class at 11: 30? 九、1.I like winter best.Because I can play in the snow.2.I＇m doing my homework.3.We/ I have maths, Chinese and English.4.She often reads books after dinner.5.It＇s on September 10th.(本题答案不唯一)十、2 3 1 5 4 阅读与写作专项复习卷 时间: 60 分钟 满分: 100 分 题号 一 二 三 四 五 六 七 总分 得分 阅 读 部 分 一、完形填空。(10 分)The Spring Festival(春节)is the 1 New Year＇s Day.It usually comes 2 January or February.Everyone in China 3 the Spring Festival very much.Before the Spring Festival 4 , Li Ming usually 5 his parents clean their house and 6 shopping and does other housework.On that 7 people wear new clothes and get together with their families.They also eat dumplings, New Year＇s cakes, and other 8.Li Ming likes New Year＇s cakes.But Wang Hong says dumplings are more 9.Children can get lucky money(压岁钱).How 10 they are!()1.A.china B.China C.Chinese()2.A.on B.in C.after()3.A.has B.likes C.like()4.A.goes B.comes C.hears()5.A.helps B.makes C.takes()6.A.buys B.goes C.does()7.A.month B.year C.day()8.A.food B.drinks C.fruit()9.A.best B.good C.delicious()10.A.happy B.love C.delicious 二、选词填空, 完成短文。(10 分)birthday don＇t Sunday get football happy shopping having eating singing Today is 1.I 2 go to school.It＇s my 3 today.I 4 up very early.Then I play 5 with my dad.In the afternoon, I go 6 with my mom.We buy many things.Now, it＇s 5: 30 p.m.We are 7 a birthday party.I＇m 1.2.3.4.5.6.7.8.9.10.8 the birthday cake.My dad and mom are 9 Happy Birthday to me.We are all very 10.三、阅读短文, 选择正确的图片。(10 分)I＇m Lucy.Today is the second Sunday in May.It＇s Mother＇s Day.My mother is good to us.She is hard ­ working.She usually gets up at 6: 00 a.m.She cooks breakfast for my brother and me.We want to give her a surprise(惊喜)today.Look!I＇m cooking breakfast for my mother.She likes milk and bread.And what is my brother doing? He is cleaning the room.My mother is coming.She feels so surprised.And she is very happy.()1.What holiday is it today? A.B.()2.My mother usually early.A.B.()3.What does Lucy do for her mother? A.B.()4.What does Lucy＇s brother do for their mother? A.B.()5.Lucy＇s mother is today.A.B.四、阅读短文, 判断下列句子正(T)误(F)。(20 分)(一)Big Ben is not the name of a man.It＇s the name of a clock.It＇s in London.London is the capital city of England.The big clock has four faces.So no matter where you stand, you can read the face of the clock.The hands are about four meters(米)long.If you go to London, you may want to go to the Palace of Westminster.In that place you will find Big Ben siting at the top of the clock tower in the Palace of Westminster.The big clock makes a loud noise.“Ding­dong, ding­dong!” The clock strikes every quarter of an hour.()1.Big Ben is a man in England.()2.Big Ben has four faces.()3.The clock strikes once an hour.()4.Big Ben is on the top of the clock tower in the Palace of Westminster.()5.Big Ben is very quiet.(二)A farmer is walking in the forest.He is very tired.Now he is sleeping under a big tree.One of his shoes is beside him.A monkey picks up the shoe and climbs up a tree.The farmer wakes up(醒来).He is drinking water.The monkey is drinking water, too.The farmer can＇t find his shoe.He is shouting, “Hey, Monkey.Give it back to me.” The monkey is shouting, too.It is imitating the farmer.The farmer thinks, “The monkey likes imitating.I have a good idea!” He takes off his another shoe and throws(扔)it away.Then the monkey throws the shoe away, too.Now the man has his shoes.()1.The man is sleeping.His shoes are on his feet.()2.The farmer is drinking water, and the monkey is shouting.()3.The word imitating means “模仿”.()4.The farmer throws his another shoe away because he doesn＇t want the shoe.()5.The farmer is clever.五、阅读短文, 根据短文内容补全句子。(10 分)It is fine today.The sun is shining.Mr Smith and his family are walking in the park.Mr Smith and his wife are looking at some flowers.His son John is watching the planes in the sky.His daughter Suzy is walking beside him.She is looking at the boats on the lake.There are many people in the park.Some of them are swimming, some of them are boating, some children are playing games and some women are talking.1.Mr Smith in the park with his family.2.Mr Smith＇s wife is looking at with him.3.many people in the park.4.Some children in the park.5.Suzy is looking at the boats.六、阅读短文, 根据短文内容回答问题。(10 分)I＇m Liu Hua.I＇m a girl.It＇s my diary(日记).Today is April 1st.It＇s my birthday.It＇s windy and warm.I get up at 6: 20.After breakfast, I visit my grandparents.And then, I climb mountains with my friends in the afternoon.In the evening, I have a birthday party in my house.Some friends come to my house.They give me many pretty gifts.My mother cooks delicious food for us.My father makes a birthday cake for me.We have a happy time.1.When is Liu Hua＇s birthday? 2.What＇s the weather like today? 3.What does Liu Hua do in the afternoon? 4.Does Liu Hua＇s mother cook delicious food? 5.What does Liu Hua＇s father do for her birthday? 写 作 部 分 七、写作练习。(30 分)1.同学们, 你们每天的学校生活是怎样安排的呢? 我们一起来分享。(6 分)要求: 语句通顺, 不少于 50 词, 书写工整。

2.我们的世界丰富多彩, 四季变化美妙无穷。每个人都有自己喜欢的季节, 请根据下面的表格信息写一篇小短文。

条理要清晰, 语句要通顺。不少 于 6 句话。(6 分)Name Amy Sarah Mike John Favourite season autumn winter summer spring Activity pick apples make a snowman go swimming plant trees 3.相信大多数同学都喜欢过生日, 因为可以得到期盼已久的礼物, 可以有热 闹的聚会……你的生日是什么时候呢? 你知道爸爸妈妈的生日是什么时 候吗? 你们都是怎样过生日呢? 请你来写一写告诉大家吧。不少于 5 句话。

(6 分)4.假如你是一名图书管理员, 请你写出五条图书馆的规则。

根据提示写一 写, 不少于 5 句话。(例如: 小声说话, 保持安静, 保持桌面整洁, 借书时不 要插队……)(6 分)5.现在是晚上 8 点钟。根据 Chen Jie 下面提供的信息, 用现在进行时来描述 Chen Jie 一家的情况。不少于 5 句话。(6 分)Father: read a book Mother: watch TV Grandpa: listen to music Grandma: clean the room Chen Jie: do homework Sister: play computer games 阅读与写作专项复习卷 一、1.C 点拨: China 中国, 名词;Chinese 中国的, 形容词。

2.B 点拨: 月份前用介词 in。

3.B 点拨: 主语是 Everyone, 谓语动词用第三人称单数形式。

6.pep五年级下册英语课 篇六

bus / bqs/ 汽车

bike / baik/n. 自行车;脚踏车

taxi / 5taksi/ 出租车

jeep / dvi:p/n.吉普车

desk / desk/ 课桌

chair / tfze/ 椅子

walkman n.随身听

lamp / lamp/n.灯vt.照亮

your / jr:/pron. 你的，你们的

zoo / zu:/n.动物园

play / plei/vt. 游戏;扮演;演奏;播放;同…比赛

game / geim/adj.勇敢的, 有胆量的, 关于野味的, 跛的

in / in/ 在…里面

on / rn/ 在…上面

here / hie/adv. 在这里;此时

toy / tri/n.玩具

box / brks/ 盒子

under / 5qnde/ 在下面

yeah / jve/ 是;是的

look out 留神;朝外看;照料

umbrella / qm5brele/ 雨伞

violin / 5vaie5lin/ 小提琴

vest / vest/n. 背心;汗衫

window / 5windeu/ 窗户

wind / wind, waind/n. 风;呼吸;气味;卷绕

excuse me 请原谅

problem / 5prrblem/ n.问题

use / ju:z, ju:s/ 使用

fox / frks/ 狐狸

zebra / 5zi:bre/ 班马

here you are 给你

7.五年级下册综合实践活动 篇七

人教版五年级数学下册综合实践活动——打电话

【教学目标】

1.使学生在解决问题的多种方案中寻找最优方案，初步体会运筹思想和对策论方法在解决问题中的运用；

2.经历设计打电话方案的过程，并找出最优方案，体会画图分析、交流讨论的学习方法；

3.在学习过程中体会数学和生活的紧密联系以及优化思想在生活中的应用，培养学生应用数学意识解决实际问题的能力和归纳推理的思维能力。

【教学重点、难点】

理解打电话的最优方案并能够运用最优方案解决一些简单的实际问题。

【教学过程】

一、谈话导入

师：今天早上快7点半的时候，老师接到学校的一个紧急通知，要求我们班笛子队的15个同学全部带上笛子，并且穿好演出服，今天上午要参加一次演出。由于时间紧急，我必须尽快地打电话通知到这15个同学！假如每通知一个同学需要1分钟。你觉得老师需要几分钟？

生举手：15分。

师：哦，说说你的想法，我们给这种方法起个名字叫“逐个通知”怎么样？（板书：逐个通知）还有没有更省时的方法呢？这节课我们就一起来研究打电话的最省时方案。（板书课题：打电话）

二、小组合作探究，教师巡视发现有代表性的方案

师：老师看到一些同学已经有自己的想法了，下面我们把自己的想法说给小组的同学听一听，每个同学都各抒己见，然后研究出一套你们小组认为最省时的方案来，并写出所用的时间。完成方案设计单（课件出示方案设计单）。

三、小组成果展示

师：老师发现我们班的同学真的非常优秀，每个小组都研究出了自己独特的方案，哪个小组愿意首先把你们的成果展示给大家？

（小组汇报，师适时进行评价点拨）

师：同学们设计了分组的方法，用了7分钟，和刚才我们逐个通知方案相比确实节省了一些时间，这是为什么？那怎么样才能更省时呢？对了，让所有接到通知的同学都帮老师打电话，那老师闲着吗？下面我们就一起来用这种方案来打电话好吗？

四、探究最优方案，并发现规律

结合学生表述，教师动态出示最优方案示意图（课件出示）。

这种方案真的很省时啊，才用了4分钟，比我们刚才分组通知还节约3分钟。这个方案不但速度快，而且当中还隐含着数学规律呢！你发现了吗？

生说：……

师：这几个学生真的非常了不起，我们不妨用列表的方法，可以看得更清楚一些。（出示表格）

你发现了什么？还发现了什么？

如果照这样推理，那么10分钟可以通知到多少个学生呢？

我们用这个最优方案可以在这么短的时间内通知到这么多同学，但是大家有没有想过，在实际运用这个方案时应该注意什么呢？

师：是的，在具体实施中还要事先设计好打电话的流程图，也就是说每个队员要清楚他接到电话后，后面要怎样继续通知其他的队员，只有这样才能真正做到省时高效。

五、实践运用

大家真了不起，把老师当年初中才学会的知识现在就弄懂了！我真的很佩服大家！大家知道吗？在医学界有这样一种寄生虫叫阿米巴原虫，据说这种寄生虫繁殖能力特别强，一只阿米巴原虫3分钟就能分裂繁殖为两只阿米巴原虫，按照这样的分裂繁殖方式，1只阿米巴原虫18分钟后变成了多少只阿米巴原蟲？

六、总结

通过这节课的学习，你有什么想说的吗？希望同学们在今后无论是在学习上还是生活中，如果遇到问题都能找到解决问题的最佳方案，大家有信心做到吗？

【板书设计】

打电话

15人，每通知一人需要1分钟

逐个通知 分组通知 无空闲同时通知

费时 较省时 最省时

12

22×2

32×2×2

102×2×2×……×2（10个2）

n2×2×2×……×2（n个2）