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新人教版高中英語(yǔ)必修2Unit 3 The Internet-Reading and Thinking教案二
Q5：What's Jan's next goal?Her next goal is to start a charity website to raise money for children in poor countries.Q6：What can we learn from her experiences?We learn that when we go through tough times, we can find help and support from other people online. We learn that we can feel less lonelyStep 5: While reading---rethinkingQ1: What is Jan’s attitude to the Internet ?Thankful/Grateful, because it has changed her and her life.Q2: What writing skills is used in the article ?Examples(Jan’s example, the 59-year-old man’s and the 61-year-old woman’s example)Q3: Can you get the main idea of the article ?The Internet has changed Jan’s life/Jan’s life has been changed by the Internet.Step 6 Post reading---Retell the storyMuch has been written about the wonders of the World Wide Web. There are countless articles (1)telling(tell) us how the Internet has made our lives more convenient. But the Internet has done a lot (2)more(much) for people than simply make life more convenient. People’s lives (3) have been changed(change) by online communities and social networks so far. Take Jan for example, who developed a serious illness that made her (4)stuck(stick) at home with only her computer to keep (5)her(she) company. She joined an online group (6)where she could share problems, support and advice with others. She considered the ability to remove the distance between people as one of the greatest (7)benefits(benefit). She was so inspired (8)that she started an IT club in which many people have been helped. She has started to learn more about how to use the Internet to make society better. Her next goal is to start a charity website to raise money (9)for children in poor countries. Jan’s life has been (10)greatly(great) improved by the Internet.
新人教版高中英語(yǔ)必修2Unit 3 The Internet-Reading for Writing教案二
8. However, the more polite you are, the less likely it is you will be attacked. 然而, 你越有禮貌, 你被攻擊的可能性就越小。 Step 8 Writing---the articleHow to stay safe in the online chat roomToday I thought I’d blog about a question that has been asked many times--- how do you stay safe online and avoid bad experiences in the online chat room ? I’m not an expert, but many years as a blogger have taught me a thing or two.First of all, there’s the golden rule of the Internet: keep out of what makes you uneasy. Don’t post comments or click on anything. Second, protect your privacy. Don’t give out too much private information like your address, phone numbers, the ID numbers, etc. Third, be polite. If you are polite to others on the Internet, you won’t be attacked in normal situation. Finally, don’t believe in others easily and never meet someone you met online alone. It is very dangerous.Have you had any bad experiences online, or do you have some good advice for staying safe? Post your comments below!Step 9 Pair workExchange drafts with a partner. Use this checklist to help your partner revise his/her draft.1. Does the writer tell the reader what he/she know about the topic ?2. Are the tips and suggestions well organised ?3. Has the writer defined the new words ?4. Does the author include examples, comparison, or explanations ?5. Does the writer end by asking readers to leave comments and/or suggestions ?6. Can you find any grammar or spelling mistakes.Step 6 HomeworkPut up your revised draft in the classroom or read it to your class.
新人教版高中英語(yǔ)必修2Unit 4 History and Traditions-Discovering Useful Structure教案二
This teaching period mainly deals with grammar: The past participle is used as attributive and objective complement.1. Guide students to review the basic usages of the past participle used as attributive and objective complement.2. Lead students to learn to use some special cases concerning the past participle used as attributive and objective complement flexibly.3. Strengthen students’ great interest in grammar learning.1. Help students to appreciate the function of the past participle used as attributive and objective complement.2. Instruct students to write essays using the past participle used as attributive and objective complement.Step1:溫故而知新。Analyze the underlined phrases and then sum up the common usages of the past participles.1．(教材P41)They had castles built(build) all around England, and made changes to the legal system．2．(教材P42)They use the same flag, known(know) as the Union Jack，．．．3．(教材P42)Judy and I had our car parked(park) in an underground car park near Trafalgar Square, where we could get our car battery charged(charge)．Common points: f the past participle used as attributive and objective complement.Step 2:過(guò)去分詞作定語(yǔ)時(shí)的意義1．及物動(dòng)詞的過(guò)去分詞作定語(yǔ)，在語(yǔ)態(tài)上表示被動(dòng)；在時(shí)間上，常表示動(dòng)作已經(jīng)發(fā)生或完成，有時(shí)也不表示時(shí)間性。Our teacher watched us doing the experiment and gave us a satisfied smile at last．我們的老師看著我們做實(shí)驗(yàn)，最后給了我們一個(gè)滿意的微笑。The plan put forward at the meeting will be carried out soon．會(huì)上提出的計(jì)劃將很快被執(zhí)行。2．不及物動(dòng)詞的過(guò)去分詞作定語(yǔ)，它不表示被動(dòng)意義，只強(qiáng)調(diào)動(dòng)作完成。Many little kids like gathering fallen leaves in the yard．
新人教版高中英語(yǔ)必修2Unit 4 History and Traditions-Reading and Thinking教案二
Step 5 While reading---Task 3Read the text again and answer the following questions.Q1: How many countries does the UK consist of ?4 Q2: What are the four countries of the United Kingdom?England, Wales, Scotland and Northern Ireland Q3: Which two were the first to be joined together ?England and WalesQ4: What are the two chief advantages of studying the history of a country ?The first one is to help you understand more about the country and its traditions.The second one is to make visiting it more enjoyable.Q5: What’s the author’s attitude towards studying the history ?Supportive/positiveStep 6 Post reading---Retell the textThe United Kingdom, Great Britain, Britain, England—many people are confused by (1)_____ these different names mean. In the 16th century, the nearby country of Wales (2) __________(join) to the Kingdom of England. In the 19 th century, the Kingdom of Ireland was added to create the United Kingdom of Great Britain and Ireland. Finally, the southern part of Ireland (3) ______ (break) away from the UK, which resulted in the full name we have today. However, most people just use the (4)_________(shorten) name: the UK. The four countries (5)__________ belong to the United Kingdom work together in some areas. There were four sets of invaders and the last group were the Normans. They had castles (6)_________(build) all around England and made changes (7)__________ the legal system. Studying the history of the country will make your visit much more (8)_________(enjoy). The capital city London is (9)___ ancient port city that has a history (10)______(date) back to Roman times. 1. what 2.was joined 3.broke 4.shortened 5.that 6. built 7.to 8.enjoyable 9.an 10.dating Step 6 Homework
新人教版高中英語(yǔ)必修3Unit 2 Morals and Virtues教學(xué)設(shè)計(jì)二
Activity 41. Students complete the task of activity 4, then teachers and students check the answers. 2. The teacher organized the students to work together and asked them to use the tables and mind maps sorted out before to retold the important choices in Lin Qiaozhi's life and their resultsStep 5 Language points1. The teacher asks the students to read the text carefully, find out the core words and long and difficult sentences in the text and draw lines, understand the use of vocabulary, and analyze the structure of long and difficult sentences. 2. The teacher explains and summarizes the usage of core vocabulary and asks the students to take notes. 3. The teacher analyzes and explains the long and difficult sentences that the students don't understand, so that the students can understand them better. Step 6 Homework1. Read the text again, in-depth understanding of the text; 2. Master the use of core vocabulary and understand the long and difficult sentences. 3. Complete relevant exercises in the guide plan. 1、通過(guò)本節(jié)內(nèi)容學(xué)習(xí)，學(xué)生是否理解和掌握閱讀文本中的新詞匯的意義與用法；2、通過(guò)本節(jié)內(nèi)容學(xué)習(xí)，學(xué)生能否結(jié)合文本特點(diǎn)總結(jié)林巧稚的人生原則和人格品質(zhì)特征；3、通過(guò)本節(jié)內(nèi)容學(xué)習(xí)，學(xué)生能否針對(duì)人生抉擇發(fā)表自己的看法；能否全面地、客觀地、理性地看待問(wèn)題，進(jìn)而對(duì)道德和人性有更加深入的思考和理解。
人教版高中歷史必修3宋明理學(xué)教案2篇
二、程朱理學(xué)：1、宋代“理學(xué)”的產(chǎn)生：（1）含義：所謂“理學(xué)”，就是用“理學(xué)”一詞來(lái)指明當(dāng)時(shí)兩宋時(shí)期所呈現(xiàn)出來(lái)的儒學(xué)。廣義的理學(xué)，泛指以討論天道問(wèn)題為中心的整個(gè)哲學(xué)思潮，包括各種不同的學(xué)派；狹義的理學(xué)，專指程顥、程頤、朱熹為代表的，以“理”為最高范疇的學(xué)說(shuō)，稱為“程朱理學(xué)”。理學(xué)是北宋政治、社會(huì)、經(jīng)濟(jì)發(fā)展的理論表現(xiàn)，是中國(guó)古代哲學(xué)長(zhǎng)期發(fā)展的結(jié)果，是批判佛、道學(xué)說(shuō)的產(chǎn)物。他們把“理”或“天理”視作哲學(xué)的最高范疇，認(rèn)為理無(wú)所不在，不生不滅，不僅是世界的本原，也是社會(huì)生活的最高準(zhǔn)則。在窮理方法上，程顥“主靜”，強(qiáng)調(diào)“正心誠(chéng)意”；程頤“主敬”，強(qiáng)調(diào)“格物致知”。在人性論上，二程主張“去人欲，存天理”，并深入闡釋這一觀點(diǎn)使之更加系統(tǒng)化。二程學(xué)說(shuō)的出現(xiàn)，標(biāo)志著宋代“理學(xué)”思想體系的正式形成?！竞献魈骄俊克未袄韺W(xué)”興起的社會(huì)條件：
人教版新課標(biāo)高中物理必修1牛頓第一定律教案3篇
一、知識(shí)與技能１、知道伽利略的理想實(shí)驗(yàn)及其主要推理過(guò)程和推論，知道理想實(shí)驗(yàn)是科學(xué)研究的重要方法２、理解牛頓第一定律的內(nèi)容及意義；理解力和運(yùn)動(dòng)的關(guān)系，知道物體的運(yùn)動(dòng)不需要力來(lái)維持。３、理解慣性的概念，知道質(zhì)量是慣性大小的量度；會(huì)用慣性解釋一些現(xiàn)象。二、過(guò)程與方法１、觀察生活中的慣性現(xiàn)象，了解力和運(yùn)動(dòng)的關(guān)系２、通過(guò)實(shí)驗(yàn)加深對(duì)牛頓第一定律的理解３、理解理想實(shí)驗(yàn)是科學(xué)研究的重要方法三、情感態(tài)度與價(jià)值觀１、通過(guò)伽利略和亞里士多德對(duì)力和運(yùn)動(dòng)關(guān)系的不同認(rèn)識(shí)，了解人類認(rèn)識(shí)事物本質(zhì)的曲折性２、感悟科學(xué)是人類進(jìn)步的不竭動(dòng)力［教學(xué)重點(diǎn)］１、理解力和運(yùn)動(dòng)的關(guān)系２、對(duì)牛頓第一定律和慣性的正確理解３、理想實(shí)驗(yàn)［教學(xué)難點(diǎn)］１、力和運(yùn)動(dòng)的關(guān)系２、慣性和質(zhì)量的關(guān)系［課時(shí)安排］1課時(shí)［教學(xué)過(guò)程］［引入］
人教版新課標(biāo)高中物理必修1牛頓第一定律教案3篇
一、知識(shí)與技能１、知道伽利略的理想實(shí)驗(yàn)及其主要推理過(guò)程和推論，知道理想實(shí)驗(yàn)是科學(xué)研究的重要方法２、理解牛頓第一定律的內(nèi)容及意義；理解力和運(yùn)動(dòng)的關(guān)系，知道物體的運(yùn)動(dòng)不需要力來(lái)維持。３、理解慣性的概念，知道質(zhì)量是慣性大小的量度；會(huì)用慣性解釋一些現(xiàn)象。二、過(guò)程與方法１、觀察生活中的慣性現(xiàn)象，了解力和運(yùn)動(dòng)的關(guān)系２、通過(guò)實(shí)驗(yàn)加深對(duì)牛頓第一定律的理解３、理解理想實(shí)驗(yàn)是科學(xué)研究的重要方法三、情感態(tài)度與價(jià)值觀１、通過(guò)伽利略和亞里士多德對(duì)力和運(yùn)動(dòng)關(guān)系的不同認(rèn)識(shí)，了解人類認(rèn)識(shí)事物本質(zhì)的曲折性２、感悟科學(xué)是人類進(jìn)步的不竭動(dòng)力［教學(xué)重點(diǎn)］１、理解力和運(yùn)動(dòng)的關(guān)系２、對(duì)牛頓第一定律和慣性的正確理解３、理想實(shí)驗(yàn)［教學(xué)難點(diǎn)］１、力和運(yùn)動(dòng)的關(guān)系２、慣性和質(zhì)量的關(guān)系
在第二批主題教育輪訓(xùn)總結(jié)時(shí)的講話
要分類推進(jìn)，對(duì)能改的問(wèn)題馬上改，一時(shí)解決不了的要明確具體整改措施和時(shí)限，需要長(zhǎng)期解決的要?jiǎng)澐蛛A段明確整改目標(biāo)，緊盯不放、階梯推進(jìn)。要聯(lián)動(dòng)推進(jìn)，第一批、第二批主題教育中，有些問(wèn)題需要機(jī)關(guān)和基層上下聯(lián)動(dòng)共同解決，各負(fù)責(zé)單位要加強(qiáng)溝通聯(lián)系，指導(dǎo)下級(jí)不等不拖先動(dòng)起來(lái)。同時(shí)，對(duì)基層反映的問(wèn)題要積極接納、主動(dòng)認(rèn)領(lǐng)，確保問(wèn)題解決形成“回路”、形成合力。（四）嚴(yán)抓指導(dǎo)督導(dǎo)。第二批主題教育展開(kāi)，D委機(jī)關(guān)必須走在前列、做好表率，為基層立好樣板。要力度不減嚴(yán)抓本級(jí)，結(jié)合D委中心組學(xué)習(xí)、組織生活，每月拉出一張表統(tǒng)籌推進(jìn)主題教育，每次集體活動(dòng)要認(rèn)真考勤登記，各局室辦一人不落做好補(bǔ)課。同時(shí)，領(lǐng)導(dǎo)小組辦公室和各部委，突出副處級(jí)上干部，做好讀書(shū)情況的檢查抽查。要指導(dǎo)基層籌劃開(kāi)局，第二批主題教育展開(kāi)后，向基層推廣機(jī)關(guān)開(kāi)展主題教育的有益經(jīng)驗(yàn)做法，指導(dǎo)基層搞好方案擬制、審核把關(guān)，確保梯次有序推進(jìn)。
人教版高中歷史必修2世界經(jīng)濟(jì)的區(qū)域集團(tuán)化教案2篇
1、知識(shí)與能力：（1）了解歐洲聯(lián)盟的形成過(guò)程，剖析歐洲國(guó)家的一體化由經(jīng)濟(jì)實(shí)體向政治實(shí)體轉(zhuǎn)變的原因和實(shí)質(zhì)；（2）了解北美自由貿(mào)易區(qū)的形成過(guò)程，由北美自由貿(mào)易區(qū)的形成原因分析世界經(jīng)濟(jì)全球化與經(jīng)濟(jì)區(qū)域集團(tuán)化之間的關(guān)系和影響。（3）了解亞太經(jīng)濟(jì)合作組織的形成過(guò)程，明確其特點(diǎn)及出現(xiàn)此特點(diǎn)的原因。掌握中國(guó)在加入該組織后所發(fā)揮的作用，并由此引申出中國(guó)在經(jīng)濟(jì)區(qū)域集團(tuán)化過(guò)程中所發(fā)揮的作用。2、過(guò)程與方法：（1）通過(guò)學(xué)生對(duì)三大經(jīng)濟(jì)區(qū)域集團(tuán)形成過(guò)程和特點(diǎn)的比較，鍛煉學(xué)生把具體的歷史現(xiàn)象與整體的社會(huì)背景聯(lián)系的能力，培養(yǎng)學(xué)生建立起全面的歷史觀。（2）通過(guò)對(duì)經(jīng)濟(jì)區(qū)域集團(tuán)化趨勢(shì)的出現(xiàn)和它與經(jīng)濟(jì)全球化之間關(guān)系的分析，培養(yǎng)學(xué)生辨證的看問(wèn)題，透過(guò)現(xiàn)象分析本質(zhì)的能力。
人教版新課標(biāo)高中物理必修1用牛頓運(yùn)動(dòng)定律解決問(wèn)題（二）說(shuō)課稿2篇
教師活動(dòng)：（1）組織學(xué)生回答相關(guān)結(jié)論，小組之間互相補(bǔ)充評(píng)價(jià)完善。教師進(jìn)一步概括總結(jié)。（2）對(duì)學(xué)生的結(jié)論予以肯定并表?yè)P(yáng)優(yōu)秀的小組，對(duì)不理想的小組予以鼓勵(lì)。（3）多媒體投放板書(shū)二：超重現(xiàn)象：物體對(duì)支持物的壓力(或?qū)覓煳锏睦?大于物體所受到的重力的情況稱為超重現(xiàn)象。實(shí)質(zhì)：加速度方向向上。失重現(xiàn)象：物體對(duì)支持物的壓力(或?qū)覓煳锏睦?小于物體所受到的重力的情況稱為失重現(xiàn)象。實(shí)質(zhì)：加速度方向向下。（4）運(yùn)用多媒體展示電梯中的現(xiàn)象，引導(dǎo)學(xué)生在感性認(rèn)識(shí)的基礎(chǔ)上進(jìn)一步領(lǐng)會(huì)基本概念。4．實(shí)例應(yīng)用，結(jié)論拓展：教師活動(dòng)：展示太空艙中宇航員的真實(shí)生活，引導(dǎo)學(xué)生應(yīng)用本節(jié)所學(xué)知識(shí)予以解答。學(xué)生活動(dòng)：小組討論后形成共識(shí)。教師活動(dòng)：（1）引導(dǎo)學(xué)生分小組回答相關(guān)問(wèn)題，小組間互相完善補(bǔ)充，教師加以規(guī)范。（2）指定學(xué)生完成導(dǎo)學(xué)案中“思考與討論二”的兩個(gè)問(wèn)題。
人教版高中語(yǔ)文必修2《成語(yǔ)：中華文化的微縮景觀》教案2篇
七、教學(xué)反思這堂課有眼下看得見(jiàn)的效果和暫時(shí)看不見(jiàn)的長(zhǎng)遠(yuǎn)的效果，學(xué)生收益明顯：1．學(xué)生學(xué)到的不只是成語(yǔ)本身。學(xué)生從網(wǎng)絡(luò)上搜集材料，分析整理，不只是學(xué)成語(yǔ)，探究能力也得到提高。對(duì)成語(yǔ)的梳理探究，是讓學(xué)生做一件很具體的事——梳理、分析、歸類。重在過(guò)程，重在課外、課前學(xué)生的工作。這樣的教學(xué)設(shè)計(jì)很有價(jià)值，讓學(xué)生在活動(dòng)中得到提高。2．開(kāi)拓了學(xué)生的眼界。學(xué)生放眼各種報(bào)刊，從報(bào)刊中發(fā)現(xiàn)問(wèn)題——大家都可能出錯(cuò)。這樣一來(lái)學(xué)生的眼界變寬了，自信心增強(qiáng)了。3．對(duì)成語(yǔ)的理解、運(yùn)用比過(guò)去深刻。讓學(xué)生從對(duì)一個(gè)個(gè)具體成語(yǔ)的理解入手，進(jìn)而認(rèn)識(shí)到以后用成語(yǔ)不能犯“望文生義”等錯(cuò)誤，從個(gè)例上升到一般。4．讓學(xué)生知道以后自己運(yùn)用成語(yǔ)應(yīng)抱什么態(tài)度，用什么方法。別人錯(cuò)用成語(yǔ)，是前車(chē)之鑒。
人教版高中政治必修2國(guó)際社會(huì)的成員：主權(quán)國(guó)家和國(guó)際組織教案
（1）1945.10.24日，《聯(lián)合國(guó)憲章》生效，聯(lián)合國(guó)正式成立。主要機(jī)構(gòu)有：聯(lián)合國(guó)大會(huì)、安全理事會(huì)、經(jīng)濟(jì)及社會(huì)理事會(huì)、托管理事會(huì)、國(guó)際法院、秘書(shū)處等。（2）聯(lián)合國(guó)的宗旨：維護(hù)國(guó)際和平與安全；發(fā)展國(guó)際間以尊重人民平等權(quán)利及自決原則為基礎(chǔ)的友好關(guān)系；促進(jìn)國(guó)際合作，以解決國(guó)際間屬于經(jīng)濟(jì)、社會(huì)、文化及人類福利性質(zhì)的國(guó)際問(wèn)題；作為協(xié)調(diào)各國(guó)活動(dòng)的中心。簡(jiǎn)單地說(shuō)，就是維護(hù)國(guó)際和平與安全，促進(jìn)國(guó)際合作與發(fā)展。（3）聯(lián)合國(guó)的原則：各會(huì)員國(guó)主權(quán)平等，履行憲章規(guī)定的義務(wù)，以和平方式解決國(guó)際爭(zhēng)端，不得對(duì)其他國(guó)家進(jìn)行武力威脅或使用武力，集體協(xié)作，不干涉任何國(guó)家的內(nèi)政，確保非會(huì)員國(guó)遵守上述原則。（4）聯(lián)合國(guó)的作用：聯(lián)合國(guó)在維護(hù)世界和平與安全，促進(jìn)經(jīng)濟(jì)、社會(huì)的發(fā)展，以及實(shí)行人道主義援助等方面發(fā)揮著積極作用。
人教版高中歷史必修2發(fā)達(dá)的古代農(nóng)業(yè)教案2篇
（四）概括古代中國(guó)農(nóng)業(yè)經(jīng)濟(jì)的基本特點(diǎn)從歷史地位、生產(chǎn)結(jié)構(gòu)、基本特征、基本模式等幾方面，小組討論古代中國(guó)農(nóng)業(yè)經(jīng)濟(jì)的特點(diǎn)，然后展示。1、歷史地位：中國(guó)是獨(dú)立發(fā)展、自成體系的世界農(nóng)業(yè)起源中心之一。2、生產(chǎn)結(jié)構(gòu)：種植業(yè)和家畜飼養(yǎng)業(yè)相結(jié)合，以種植業(yè)為主，家畜飼養(yǎng)業(yè)為輔。3、基本特征：農(nóng)業(yè)生產(chǎn)精耕細(xì)作。 4、基本模式：一家一戶的小農(nóng)經(jīng)濟(jì)。知識(shí)拓展：當(dāng)今中國(guó)農(nóng)村人口膨脹，農(nóng)民生活條件急需提高，如何處理好“三農(nóng)”問(wèn)題是中國(guó)社會(huì)走向和諧健康發(fā)展的重要課題，回顧中國(guó)古代農(nóng)業(yè)的發(fā)展歷程，結(jié)合農(nóng)業(yè)發(fā)展的現(xiàn)狀，談?wù)勀愕目捶ê徒ㄗh。展示：1.因地制宜，發(fā)揮各地特色優(yōu)勢(shì)2、精耕細(xì)作和現(xiàn)代科學(xué)相結(jié)合； 3.保護(hù)生態(tài)環(huán)境，堅(jiān)持可持續(xù)發(fā)展；4.完善水利設(shè)施，政府重視。
人教版高中數(shù)學(xué)選擇性必修二導(dǎo)數(shù)的四則運(yùn)算法則教學(xué)設(shè)計(jì)
求函數(shù)的導(dǎo)數(shù)的策略(1)先區(qū)分函數(shù)的運(yùn)算特點(diǎn)，即函數(shù)的和、差、積、商，再根據(jù)導(dǎo)數(shù)的運(yùn)算法則求導(dǎo)數(shù)；(2)對(duì)于三個(gè)以上函數(shù)的積、商的導(dǎo)數(shù)，依次轉(zhuǎn)化為“兩個(gè)”函數(shù)的積、商的導(dǎo)數(shù)計(jì)算．跟蹤訓(xùn)練1 求下列函數(shù)的導(dǎo)數(shù)：(1)y＝x2＋log3x； (2)y＝x3·ex； (3)y＝cos xx.[解] (1)y′＝(x2＋log3x)′＝(x2)′＋(log3x)′＝2x＋1xln 3.(2)y′＝(x3·ex)′＝(x3)′·ex＋x3·(ex)′＝3x2·ex＋x3·ex＝ex(x3＋3x2)．(3)y′＝cos xx′＝?cos x?′·x－cos x·?x?′x2＝－x·sin x－cos xx2＝－xsin x＋cos xx2.跟蹤訓(xùn)練2 求下列函數(shù)的導(dǎo)數(shù)（1）y＝tan x； （2）y＝2sin x2cos x2解析：（1）y＝tan x＝sin xcos x，故y′＝?sin x?′cos x－?cos x?′sin x?cos x?2＝cos2x＋sin2xcos2x＝1cos2x.（2）y＝2sin x2cos x2＝sin x，故y′＝cos x.例5 日常生活中的飲用水通常是經(jīng)過(guò)凈化的，隨著水的純凈度的提高，所需進(jìn)化費(fèi)用不斷增加，已知將1t水進(jìn)化到純凈度為x%所需費(fèi)用（單位：元），為c(x)=5284/(100-x) (80<x<100)求進(jìn)化到下列純凈度時(shí)，所需進(jìn)化費(fèi)用的瞬時(shí)變化率：（1） 90% ；（2） 98%解：凈化費(fèi)用的瞬時(shí)變化率就是凈化費(fèi)用函數(shù)的導(dǎo)數(shù)；c^' (x)=〖(5284/(100-x))〗^'=(5284^’×(100-x)-"5284 " 〖(100-x)〗^’)/〖(100-x)〗^2 =(0×(100-x)-"5284 " ×(-1))/〖(100-x)〗^2 ="5284 " /〖(100-x)〗^2
人教版高中數(shù)學(xué)選擇性必修二等差數(shù)列的前n項(xiàng)和公式（2）教學(xué)設(shè)計(jì)
課前小測(cè)1．思考辨析(1)若Sn為等差數(shù)列{an}的前n項(xiàng)和，則數(shù)列Snn也是等差數(shù)列．( )(2)若a1>0，d<0，則等差數(shù)列中所有正項(xiàng)之和最大．( )(3)在等差數(shù)列中，Sn是其前n項(xiàng)和，則有S2n－1＝(2n－1)an.( )[答案] (1)√ (2)√ (3)√2．在項(xiàng)數(shù)為2n＋1的等差數(shù)列中，所有奇數(shù)項(xiàng)的和為165，所有偶數(shù)項(xiàng)的和為150，則n等于( )A．9 B．10 C．11 D．12B [∵S奇S偶＝n＋1n，∴165150＝n＋1n.∴n＝10.故選B項(xiàng)．]3．等差數(shù)列{an}中，S2＝4，S4＝9，則S6＝________.15 [由S2，S4－S2，S6－S4成等差數(shù)列得2(S4－S2)＝S2＋(S6－S4)解得S6＝15.]4．已知數(shù)列{an}的通項(xiàng)公式是an＝2n－48，則Sn取得最小值時(shí)，n為_(kāi)_______.23或24 [由an≤0即2n－48≤0得n≤24.∴所有負(fù)項(xiàng)的和最小，即n＝23或24.]二、典例解析例8.某校新建一個(gè)報(bào)告廳，要求容納800個(gè)座位，報(bào)告廳共有20排座位，從第2排起后一排都比前一排多兩個(gè)座位. 問(wèn)第1排應(yīng)安排多少個(gè)座位？分析：將第1排到第20排的座位數(shù)依次排成一列，構(gòu)成數(shù)列{an} ，設(shè)數(shù)列{an} 的前n項(xiàng)和為S_n。
人教版高中歷史必修2二戰(zhàn)后蘇聯(lián)的經(jīng)濟(jì)改革教案
⑤強(qiáng)調(diào)對(duì)外關(guān)系的靈活性。戈?duì)柊蛦谭蛑赋鲈趯?duì)外政策中要采取多種辦法選擇不同的策略路線達(dá)到既定目標(biāo)。在外交談判中不要為自己制造死胡同，也不要給對(duì)方制造死胡同，要善于迎合伙伴，尋求接觸點(diǎn)。在這種思想指導(dǎo)下，蘇共采取的對(duì)外戰(zhàn)略是以軍控為中心的緩和戰(zhàn)略，具體政策是繼續(xù)與美國(guó)就裁軍、消減核武器、限制地區(qū)沖突等問(wèn)題進(jìn)行談判，緩解蘇美關(guān)系；對(duì)西歐爭(zhēng)取建立“全歐大廈”；對(duì)東歐實(shí)行糾偏、不干涉政策；對(duì)中國(guó)改善關(guān)系，實(shí)現(xiàn)關(guān)系正常化；調(diào)整與第三世界國(guó)家關(guān)系，解決阿富汗、柬埔寨等問(wèn)題。 3、影響：①經(jīng)濟(jì)改革措施倉(cāng)促上馬，缺少宏觀決策和相應(yīng)的配套措施；加上戈?duì)柊蛦谭驔](méi)有放棄蘇聯(lián)的傳統(tǒng)做法，繼續(xù)優(yōu)先發(fā)展重工業(yè)，致使改革未達(dá)到預(yù)期的效果，蘇聯(lián)經(jīng)濟(jì)持續(xù)下滑②經(jīng)濟(jì)體制改革受挫后，把改革的重點(diǎn)轉(zhuǎn)向政治領(lǐng)域，最終導(dǎo)致國(guó)內(nèi)局勢(shì)的失控和蘇聯(lián)的解體。
人教版高中數(shù)學(xué)選擇性必修二等比數(shù)列的概念 (2) 教學(xué)設(shè)計(jì)
二、典例解析例4. 用 10 000元購(gòu)買(mǎi)某個(gè)理財(cái)產(chǎn)品一年.（1）若以月利率0.400%的復(fù)利計(jì)息，12個(gè)月能獲得多少利息（精確到1元）？（2）若以季度復(fù)利計(jì)息，存4個(gè)季度，則當(dāng)每季度利率為多少時(shí)，按季結(jié)算的利息不少于按月結(jié)算的利息（精確到10^(-5)）？分析：復(fù)利是指把前一期的利息與本金之和算作本金，再計(jì)算下一期的利息.所以若原始本金為a元，每期的利率為r ，則從第一期開(kāi)始，各期的本利和a , a(1+r)，a(1+r)^2…構(gòu)成等比數(shù)列.解：（1）設(shè)這筆錢(qián)存 n 個(gè)月以后的本利和組成一個(gè)數(shù)列{a_n }，則{a_n }是等比數(shù)列，首項(xiàng)a_1=10^4 (1+0.400%)，公比 q=1+0.400%，所以a_12=a_1 q^11 〖=10〗^4 (1+0.400%)^12≈10 490.7.所以，12個(gè)月后的利息為10 490.7-10^4≈491（元）.解：（2）設(shè)季度利率為 r ，這筆錢(qián)存 n 個(gè)季度以后的本利和組成一個(gè)數(shù)列{b_n }，則{b_n }也是一個(gè)等比數(shù)列，首項(xiàng) b_1=10^4 (1+r)，公比為1+r，于是 b_4=10^4 (1+r)^4.
人教版高中數(shù)學(xué)選擇性必修二等差數(shù)列的概念（2）教學(xué)設(shè)計(jì)
二、典例解析例3.某公司購(gòu)置了一臺(tái)價(jià)值為220萬(wàn)元的設(shè)備，隨著設(shè)備在使用過(guò)程中老化，其價(jià)值會(huì)逐年減少.經(jīng)驗(yàn)表明，每經(jīng)過(guò)一年其價(jià)值會(huì)減少d(d為正常數(shù)）萬(wàn)元.已知這臺(tái)設(shè)備的使用年限為10年，超過(guò)10年 ，它的價(jià)值將低于購(gòu)進(jìn)價(jià)值的5%，設(shè)備將報(bào)廢.請(qǐng)確定d的范圍.分析：該設(shè)備使用n年后的價(jià)值構(gòu)成數(shù)列{an}，由題意可知，an＝an－1－d (n≥2). 即：an－an－1＝－d.所以{an}為公差為－d的等差數(shù)列.10年之內(nèi)（含10年），該設(shè)備的價(jià)值不小于（220×5%=）11萬(wàn)元；10年后，該設(shè)備的價(jià)值需小于11萬(wàn)元．利用{an}的通項(xiàng)公式列不等式求解．解：設(shè)使用n年后，這臺(tái)設(shè)備的價(jià)值為an萬(wàn)元，則可得數(shù)列{an}．由已知條件，得an＝an－1－d（n≥2）．所以數(shù)列{an}是一個(gè)公差為－d的等差數(shù)列.因?yàn)閍1＝220－d，所以an＝220－d＋(n－1)(－d)＝220－nd. 由題意，得a10≥11，a11＜11. 即：{█("220－10d≥11" @"220－11d＜11" )┤解得19<d≤20.9所以，d的求值范圍為19<d≤20.9
人教版高中數(shù)學(xué)選擇性必修二等比數(shù)列的前n項(xiàng)和公式 (2) 教學(xué)設(shè)計(jì)
二、典例解析例10. 如圖，正方形ABCD 的邊長(zhǎng)為5cm ，取正方形ABCD 各邊的中點(diǎn)E,F,G,H, 作第2個(gè)正方形 EFGH，然后再取正方形EFGH各邊的中點(diǎn)I,J,K,L，作第3個(gè)正方形IJKL ，依此方法一直繼續(xù)下去. (1) 求從正方形ABCD 開(kāi)始，連續(xù)10個(gè)正方形的面積之和；(2) 如果這個(gè)作圖過(guò)程可以一直繼續(xù)下去，那么所有這些正方形的面積之和將趨近于多少？分析：可以利用數(shù)列表示各正方形的面積，根據(jù)條件可知，這是一個(gè)等比數(shù)列。解：設(shè)正方形的面積為a_1，后續(xù)各正方形的面積依次為a_2, a_(3, ) 〖…,a〗_n,…，則a_1=25,由于第k+1個(gè)正方形的頂點(diǎn)分別是第k個(gè)正方形各邊的中點(diǎn)，所以a_(k+1)=〖1/2 a〗_k,因此{(lán)a_n}，是以25為首項(xiàng)，1/2為公比的等比數(shù)列.設(shè){a_n}的前項(xiàng)和為S_n（1）S_10=(25×[1-(1/2)^10 ] )/("1 " -1/2)=50×[1-(1/2)^10 ]=25575/512所以，前10個(gè)正方形的面積之和為25575/512cm^2.(2)當(dāng)無(wú)限增大時(shí)，無(wú)限趨近于所有正方形的面積和
