人教版高中英语必修二Unit 3《Computers》(learning about language)ppt课件

[思路探索] 属于以二次函数模型为载体，考查利润最大问题．解
(1)∵广告费共 5 万元，设报纸广告费用 x 万元，则电
视广告费用 5－x 万元，利润为 w 万元． ∴R＝－2x2－(5－x)2＋13x＋11(5－x)－28(0<x≤5) ＝－3x2＋12x＋2(0<x≤5)．当 x＝2 万元时，Rmax＝14 万元，此时电视广告费用为 3 万元． ∴w＝14－5＝9(万元)．即：报纸广告费 2 万元，电视广告费 3 万元．
Discovering useful words and expressions
complete change in ways of thinking, working, etc connected computer system revolution
to make things easier
to find the answer using numbers simplity
(1)设甲地调运 x 台至 B 地，该公司运往 A 和 B 两地的总运费为 y 元，求 y 关于 x 的函数关系式． (2)求总运费不超过 1 000 元，问能有几种调运方案？ (3)求总运费最低的调运方案及最低运费．
[思路探索] 涉及电脑台数与运费的关系，属于一次函数类型．
解
(1)甲地调运 x 台到 B 地，则剩下(6－x)台电脑调运到 A
题型二
二次函数模型
【例 2】某公司通过报纸和电视两种方式做销售某种商品的广告，根据统计资料，销售收入 R(万元)与报纸广告费用 x1(万元)及电视广告费用 x2(万元)之间的关系有如下经验公式：
2 R＝－2x2 － x 1 2＋13x1＋11x2－28.
(1)若提供的广告费用共为 5 万元，求最优广告策略； (即收益最大的策略，其中收益＝销售收入－广告费用) (2)在广告费用不限的情况下，求最优广告策略(其中 x1，x2 ∈N)
1．一次函数、分段函数、二次函数模型的应用．(重点) 2．建立函数模型(建模)解决实际问题．(难点)
自学导引几种常见的函数模型 (1)一次函数模型：f(x)＝ kx＋b (k、b 为常数，k≠0)； k (2)反比例函数模型：f(x)＝ x＋b (k、b 为常数，k≠0)； 2 (3)二次函数模型： f(x)＝ ax ＋bx＋c (a、 b、 c 为常数， a≠0)； (4)分段函数模型：这个模型实际是以上两种或多种模型的综合，因此应用也十分广泛．
(3)∵y＝20x＋960 是 R 上的增函数，又 0≤x≤6，x∈N， ∴当 x＝0 时，y 有最小值为 960 元． ∴从甲地运 6 台到 A 地，从乙地运 8 台到 B 地、运 4 台到 A 地，运费最低为 960 元．
规律方法根据已知条件建立函数关系式，将实际问题数学化，注意标注自变量的取值范围．
network caculate
can be moved easily from place to place
mobile
2．3
【课标要求】
函数的应用(Ⅰ)
1．明确一次函数、二次函数、分段函数可作为数学模型解有关应用题． 2．初步掌握数学建模的方法． 3．通过数学建模的应用，培养应用意识．【核心扫描】
地；乙地应调运(8－x)台电脑至 B 地，运往 A 地 12－(8－x)＝(x ＋4)台电脑(0≤x≤6，x∈N)．则总运费 y＝30x＋40(6 － x) ＋50(8 － x)＋80(x＋，且 0≤x≤6)．
(2)若使 y≤1 000，即 20x＋960≤1 000，得 x≤2. 又 0≤x≤6，x∈N， ∴0≤x≤2，x∈N. ∴x＝0,1,2，即能有 3 种调运方案．
(2)∵广告费用不限， ∴R(x)＝f(x)＋g(x)－28，
2 其中 f(x)＝－2x2 1＋13x1，g(x)＝－x2＋11x2，
解
(1)由题意知 y－a＝kx(0≤x≤12，k<0)，即 y＝a＋kx.
55＋a ∵当 x＝12 时， y＝－55， ∴－55＝a＋12k，解得 k＝－， 12 55＋a ∴当 0≤x≤12 时，y＝a－ x， 12 55＋a ∴所求的函数关系式为 y＝a－ x(0≤x≤12)． 12 55＋29 (2)当 a＝29，x＝3 时，y＝29－ ×3＝8(℃)， 12 即当地球表面大气的温度是 29 ℃时， 3 km 上升的温度是 8 ℃.
题型一
一次函数模型
【例 1】某电脑公司在甲、乙两地各有一个分公司，甲分公司现有电脑 6 台，乙分公司有同一型号的电脑 12 台．现 A 地某单位向该公司购买该型号的电脑 10 台， B 地某单位向该公司购买该型号的电脑 8 台．已知甲地运往 A、B 两地每台电脑的运费分别是 40 元和 30 元，乙地运往 A、B 两地每台电脑的运费分别是 80 元和 50 元．
试一试：用自己的语言叙述建模流程
提示根据题意设出相应的量→列函数解析式→求解→回
归检验→结论．想一想：用函数模型解决实际问题时，函数的解与实际问题的解有何关系？
提示
用函数模型解实际问题时，求出函数的解一定要代
回实际问题检验，只有符合实际问题，才是实际问题的解．否则，应舍去．
名师点睛解实际应用题的步骤求解函数应用问题的步骤是(四步八字)： (1)审题：弄清题意，分清条件和结论，选择数学模型； (2)建模：利用数学知识，建立相应的数学模型； (3)求模：求解数学模型，得出数学结论； (4)还原：将数学问题还原为实际问题的意义.
【训练 1】大气中的温度随着高度的上升而降低，根据实测的结果上升到 12 km 为止温度的降低大体上与升高的距离成正比，在 12 km 以上温度一定，保持在－55 ℃. (1)当地球表面大气的温度是 a ℃时，在 x km 的上空为 y ℃，求 0≤x≤12 时，a、x、y 间的函数关系式； (2)当地球表面大气的温度是 29 ℃时，3 km 上空的温度是多少？

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高中英语人教版必修2课件：Unit 3 Computers

Well, in general, WWW stand for “World Wide Web”. Most people confuse the Internet with the World Wide Web. However, there is a difference. The Internet is made up of thousands of computers that are connected worldwide. WWW or World Wide Web, is what your computer uses to check out the Internet. For example, your computer uses browsers, such as Internet Explorer or Netscape (网景浏览器) to let you see and hear all the cool pictures, information, music and sounds on the Internet.
1．confuse vt. 2．connect vt. 3．browser n. 4．surf vt. 5．modem n. 6．graphics n.
使混乱；使困惑连接；联合；关联 (电脑)浏览器在……上冲浪调制解调器绘画；图像
1．What difference is there between the Internet and WWW? ________________________________________________________________ 2．What do you need if you surf the World Wide Web? ________________________________________________________________ 【答案】 1.The Internet is made up of thousands of computers that are connected worldwide；WWW is what your computer uses to check out the Internet. 2．You need to have a computer with a modem and a browser.Besides，you need to have an Internet Service Provider.

人教版高一英语必修二《Unit3Computers》评课稿

人教版高一英语必修二《Unit3Computers》评课稿1. 课程概述本文档是对人教版高一英语必修二《Unit3Computers》的评课稿。

该单元是高中英语教材的一部分，旨在帮助学生掌握关于计算机的基本知识和技能。

通过本单元的学习，学生将了解计算机的发展历史、操作系统、计算机网络等内容。

2. 教学目标本单元的教学目标主要包括以下几个方面：•了解计算机的发展历史，掌握计算机相关的词汇和表达方式。

•理解计算机的基本组成和工作原理，能够运用所学知识进行简单的操作和维护。

•掌握计算机操作系统的基本功能和使用方法。

•了解计算机网络的概念和组成，并能够简单地描述其功能和应用。

3. 教学内容3.1 计算机的发展历史本部分主要介绍了计算机的发展过程和里程碑事件。

通过学习，学生将了解到计算机的起源、发展的不同阶段以及计算机在不同领域的应用。

3.2 计算机的基本组成和工作原理本部分介绍了计算机的基本组成和工作原理。

学生将了解到计算机由硬件和软件组成，学习各个硬件部件的功能和相互之间的关系。

同时，还将学习计算机的工作原理，包括输入、处理、输出和存储等基本过程。

3.3 计算机操作系统本部分主要介绍计算机操作系统的功能和使用方法。

通过学习，学生将了解到操作系统是计算机系统中最核心的部分，掌握常见的操作系统如Windows和Linux的基本操作和配置。

3.4 计算机网络本部分介绍了计算机网络的概念和组成。

学生将了解到计算机网络的基本原理和分类，以及局域网和广域网的区别。

此外，学生还将了解计算机网络的应用场景和常见的网络设备。

4. 教学方法4.1 探究式教学法本课程采用探究式教学法，通过提问、讨论等方式激发学生的学习兴趣和主动性。

教师可以设计一些问题，引导学生自主探索和发现相关知识，进而培养学生的思维能力和创新意识。

4.2 合作学习法在教学过程中，可以采用合作学习法，鼓励学生以小组为单位进行讨论和合作。

学生可以互相交流和分享自己的理解和思考，通过合作学习促进彼此之间的学习和成长。

高中英语 Unit 3 Computers课件新人教版必修2

R1:Where were you in 1642?
C: … C: …
1. Where were you in 1642?
2. What happened to you in 1822? R2: What happened to you in 1822?
3. What were you called in 1936? 4. What did you look like in 1940s?
Welcome to our easy English class
An abacus
A huge computer
A calculator
A laptop
A PC
If I were a maths teacher, which would help me most? Why?
I
think …because… I believe that… In my opinion, …

calculating machine
tubes transistors

Supporting details
analytical machine universal machine

communication finance trade robots …

PC laptop
A huge computer is the first electronic counting machine in Europe. It was built to solve some mathematical problems.But it was too big.
A PC is a personal computer which can solve all kinds of problems and is used widely now.

人教版高中英语必修二 Unit3 《Computers ---Reading》课件 (共32张PPT)

calculator
I am very big. Scientists use me to solve some mathematical problems. Do you know who I am?
huge computer
I’m a machine that works automatically. I can do a wide variety of tasks, especially suitable for doing jobs too boring, difficult, or dangerous for human beings. Do you know who I am?
Computers were used in offices and homes. Computers connect people all over the world together.
Scanning to get
detail information
Scanning
Reading Comprehension III
Homework
1. Read the text after class and look for more information about the development of the computer and its applications.
PDA
Personal Digital Assistant
I am very small. I can be used for calculating. In China, a lot of students use me when solving mathematical problems. Do you know who I am?

高中英语人教版必修2 Unit 3 Computers 课件

What’s next?
carry things work in wars work for us in Mars
Activity 2 Thinking Q: In what ways is the computer used？
communicate with…
Watch movies & TV plays
More knowledge about computers
1. What is IT? Information Technology.
2. What is CPU? Central Processing Unit.（中央处理器） 3. What is WWW? World Wide Web. 4. What is the English for “科学技术”? science and technology.
listen to music
do shopping
search for …
play computer games
Besides, we can … with computers
• send e-mails instead of letters;
• read news at home and abroad;
register 注册，登记 software 软件
download 下载
hardware 硬件
Consolidation
• Complete the sentences with proper words. 1. We should use computers properly and
never be a m_o_u_se__ potato. 2. In the accident he e_s_ca_p_e_d_ being killed. 3. You can input the capital letters when you

高中英语必修二Unit3Computers要点解析

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这是一个人人都感兴趣的话题。【知识拓展】ｕｉｅｓｌｄ．体地：ｎｖｒａｙａｖ整ｌ全体地
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算ｃｌｌｔｒ．ａｃａ计算器ｃｌｕａｉｇ．ｕｏｎａｌｔｃｎ有私心的。算计的．明的精２Ｕｉｅ．ｎｖ￣【考纲释义】ｄ．ａｊ整体的；＂全体的
ａｉ（ｏｖ．（ｒｅｆｍ）ｉ问题、况）现，生ｓｒ情出发ｒｅ（ｏｅｒｅ）．（ｉｒｓ，ｉｎｓｓ自然事物）起升ｒｉ（ｉｄｒｉｄｖ．起：起ａｓｒｓ。ａｓ）ｔ举ｅａｅｅ托
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ｎｅｒｅｗｉｏｔｃｙｕ如果有必ｅｄａｉ）ｅｗｌｃｎａｔｏ．ｓｌ要我们会联系你。
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人教版必修二Unit 3《Computers》word教案

河北省康保一中英语组高一年级集体备课教案主备课人: 殷桂雁参加人：王培珍杨静慧安秀云马艳丽郝康李纬周燕娜备课时间：2010年11 月17日知识目标：Topic：Information technology ; history and basic knowledge of computers; robotsNew words: calculate universal, simplify, sum, operator, logical, logically, technology revolution artificial intelligence intelligent solve reality personal personally tube total totally network web application finance mobile rocket explore anyhow goal happiness download virus signal type coach arise electronic appearance character mop nicePhrases; from…on as a result so...that human race in a way with the help of deal with watch overSentence patterns ;1 making decisionsI think /I don’t think that…I believe that…I’ve decided that…Let’s decide…let’s make a decision2 ReasoningThe advantage/disadvantage is …I agree/don’t agree…because…Give me your reasons:First……second.What makes you think so?As/since……,I think……Grammar :现在完成时态被动语态的建构和用法Over time I have been changed quite a lot.First as a PC and then as a laptop , I have been used in offices and hones since the 1970sSince the 1970s many new applications have been found for meI have also been put into robots and used to make mobile phones as well as help with medical operations能力目标：让学生学习用英语表达自己的观点并进行简单的理由阐述及做出决定，并能按时间先后顺序来描述某事。

高中英语人教版必修二《Unit3 Computers》课件

Fill in the blanks
I am a(n) ___st_r_ik_e_rin an android football team.
Self
I look like a human and I’m as big as a
introductio human.
n
My computer ___c_h_ip_s_ help me move and
= ___W_h_i_le__d_o_i_n_g_h_i_s_E_n_g_li_s_h________ ___h_o_m_e_w__o_r_k_, _h_e_f_e_ll_a_s_le_e_p__. _____
5. Then she prepares reliable moves to use if a new situation arises. arise vt. 产生，产生；站起来，起身；起床；上升，升起
拓展
in the way或in one’s way 挡道，碍事反义词组：out of the way in any way 不管如何，不管怎样 in no way 决不注意：置于句首时，句子用部分倒装语序。如：
You’ll have to move — you are in my way. Please keep out of the way. I must finish the work today in any way. Teaching in school can in no way be separated from practice. In no way did he admit that he was wrong.
4) A heavy smoke arose and hung over the town.

人教版高中英语必修2《Unit 3 Computers》教案

人教版高中英语必修2《Unit 3 Computers》教案人教版高中英语必修2《Unit 3 puters》教案【一】教学准备教学目标1. To practise listening prehension.practise making decisions and reasoning教学重难点1. To practise listening prehension.practise making decisions and reasoning教学工具课件教学过程Step1. revision1. check the homework exercises.1). It has been reported that children will be offered free education. It has been reported that free education will be offered to children.2). It has been said that we will be offered the latest puter science course book.It has been planned that the latest puter science course book will be offered to us.3). I have been told by Peter that I will be lent his notebook puter for a week.I have been told by Peter that his notebook puter will be lent to me for a week.2. Question: What can puters be used as?Step2. Lead-inAs we know, science and technology is developing very fast and puters have bee smaller and smaller. They have been used in many fields. So, the 21st century is the century of information technology What does it mean?Does information technology/ IT only mean things like puters? Of cause not. Actually, it means more than puters. puters are just one kind of IT. What else do you know is part of IT?(TV, radio, CD-ROM, DVD, books)Step3. Listening (SB)1. Pre-listening: What are the changes brought by different forms of IT ?What are the advantages and disadvantages of them ?2. While-listening:Go through the chart and make sure the students look at the chart before they listen to the tape. (This is to sharpen their attention and listen for the answers. This will also help them get the gist of the text.) Then Listen to the tape and finish filling in the chart. (If necessary, play the tape for several times.)Say: After listening to their talk, we know all kinds of IT have both disadvantages and check the answers together.Type of IT Advantages DisadvantagesTV You can both listen and watch. You cannot write to friends.Web You can find information. It is very expensive.Radio You can listen to English. You cannot watch a film.Book You can get information. Sometimes it is out of date.3. Post-listening:1) (pair work): decide which type of IT is best for you to use right now. Make your choice and give your reasons by using the following expressions.I think that.In my opinion, .I believe that.I agree because.I disagree because.Ive decided that.2) (group work): Discussion :puters are useful and have brought us lots of good things, but they also cause bad effects. What attitude should we have towards the puter? (Make good use of it but never get trapped by it.)Step4. Speaking1. Pre-speakingSay: From what we have learn, we should admit that puters and the web have a great influence on the school education as well as peoples life. It has e into peoples everyday life and many families hold puters in their homes. Now there is a task for you.2. While-speaking1) Situation: You have been asked by your parents to help choose puters for your home. You and your friend have looked at several puters. Talk about the special things each puter can do. Make a decision about which kind of puter to buy and explain why.Information input: Show students some pictures of different puters (desktop puter laptop puter )Language input: Useful expressions (Repeat it to strengthen students ability of use it.)Supporting an opinion Challenging an opinionI think that , because Perhaps, but what if / about ?First, Have you thought about ?One reason is that What makes you think that ?I think it is better because I dont like it because.(Pair work )Use the expressions to support your opinion or challenging others opinions.2) Oral report: (inpidual work )Do an oral report to your father and start your report like this: I looked at many different puters. The one I have chosen is the PEP personal puter. One of the main reasons is that it is suitable for homes. I found that3. Post-speakingConclusionWhat useful expression do we use to make a decision and reason?(In this way, they can review and use the words and phrases again.) Step6 Pre-writingSay: Imagine what problems and delights this android might have to deal with while it is serving you. Try yourself in someone elses shoes is an important way of understanding how other people feel.Then discuss: You are an android. You work for a family with one child who is very spoiled. The parents want you to do everything for them. The parents are nice, but they often ask you to watch over their child. How do you feel? What would you do if the child asked you to do his homework for him? Would you ever tell the child no?Step7 WritingSay: Write a passage about the result of your discussion! It should contain:What do you have to do?What is the child like?What is the parents requirement of the child?What do the parents want you to do?What does the child want you to do?Then what will you do? How do you feel?Sample writing:Hello everybody, my name is Liu am a 321 model work for the Li family. Mr and Mrs Li work very hard Li is an architect and designs great tallapartment Li is a doctor and has to look after many remember all the plans for Mr Li’s projects and can tell Mrs Li which drugs are the best to give any particular patient. And I also look after their library. I store all the books that they borrow from their school or friends in my course my brain is as large as a mountain, so work like that is no trouble to really eat books just like people eat food.The Lis have a child who is very spoiled. He needs me to remember all his school textbooks so that I can do his homework for just gives me the information on the subject, what has to be done and the page numbers and I get on with it while he enjoys himself with his I don’t think it is right to do his homework for him it’s somewhat cheating. However, his parents are very concerned at the pressure of work in school these child has too much homework to do. They like him to go to the key school but they also want him to be able to have hobbies, learn to swim and keep fit! Poor child!So they consider me the most important person in the family after am always introduced to their friends and play with visiting am the perfect family academic aid and, although I was not cheap to buy, Mr Li says I was worth every yuan!Step8 AssessmentGet the students to assess their writing ability according to the following the questions:1. Is your position well developed?2. Are your ideas well organized to the point?3. Do you have a good choice of words and idioms in your writing?4. Do you get a good mastery of plex structures of language?5. What kind of mistakes have you made in your writing?Step9: HomeworkWrite about your discussion. You may begin like this:Hello, everyone. My name is ___. Im 321 model android. I work for the Li family.课后小结学了这节课，你有什么收获?课后习题完成课后习题一、二。

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