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人教版新目標(biāo)初中英語(yǔ)七年級(jí)下冊(cè)I want to be an actor教案2篇
三、教學(xué)建議第一課時(shí)：1. Lead in (Vocabulary)A) Before class, teacher should collect some pictures of working places. For example: Bank, TV Station, Restaurant, Police Station, Hospital ...B) In class, show students the pictures (PowerPoint, OHP). Ask students to tell the name of the working places and the name of the jobs.Shop assistant, doctor, actor, reporter, police office, waiter, bank clerk, studentC) Do exercise 1a and 3a.2. Bingo GameAsk groups of students to make up pairs of cards with a job on one and the related workplace on the other. For example, waiter / restaurant, teacher / school, doctor / hospital. Encourage students to use both the job / workplace combinations in the book and the ones that students came up during class discussions. Be sure they have twice as many sets of cards as there are students in the group. They can make two sets of cards for a single job / workplace, if necessary. Then have each group mix up its set of cards and hand their cards out in random order. Each time a student gets a pair of cards that match, he or she can lay these cards down. The goal is to have no cards in your hand at the end.3. Task OneA) Ask students to work in pairs and ask the partner what does he / she want to be in the future.e. g. :What do you / does he / does she want to be?I want to be a.Why?Because it's (adj).B) Vocabulary: Section B, 1a4. Homework 1.2.
人教版新目標(biāo)初中英語(yǔ)七年級(jí)下冊(cè)Where is your pen pal from教案
2.1Match the country with the language.Step II Reading3a? let the students read the letter fast and answer the questions.? Let the students ask more questions about the letter as possible as the can.Step III Writing3b.Step IV. Pairwork2cStep V Listening2a, 2bStep V. HomeworkExercises book(1) P3Exercises book (2) P3Period FourStep I . Dictate the words and sentences in Unit1.Step II. Self-checkStep III. Check the answers for Exercises book in the unit.Step IV. Home workRevise and preparation for unit 2.教學(xué)反思：通過(guò)本單元的學(xué)習(xí)，學(xué)生基本可以談?wù)撊藗兊膰?guó)籍，居住城市及其所說(shuō)的語(yǔ)言，通過(guò)書信方式去介紹自己并尋找筆友。但在涉及到國(guó)外的一些城市時(shí)，學(xué)生對(duì)這方面的知識(shí)相對(duì)欠缺，能介紹的城市并不多，也反應(yīng)出學(xué)生課前預(yù)習(xí)不充分，這跟學(xué)生學(xué)習(xí)條件也有關(guān)，大多數(shù)學(xué)生無(wú)法通過(guò)網(wǎng)絡(luò)獲取所需信息。因此，在以后的教學(xué)中要多指導(dǎo)學(xué)生通過(guò)計(jì)算機(jī)網(wǎng)絡(luò)獲取信息，拓寬知識(shí)面。
人教版新目標(biāo)初中英語(yǔ)七年級(jí)下冊(cè)What do you think of game shows教案
五、教學(xué)Section B-2c1. Pair work: What do you think of the belt/sunglasses/…? What does your father/mother/… think of your scarf/belt…?2. Group work（1）. Teacher shows some different kinds of school uniforms (制服)and asks : “ What do you think of your school uniforms? If you have a chance to choose your school uniforms, what kind would you like to choose?”（2）. Discuss in groups.（3）.Get some Ss to report in class.說(shuō)明：這一步旨在讓學(xué)生運(yùn)用已有的語(yǔ)言知識(shí)談?wù)搶?duì)事物的看法和意見，并簡(jiǎn)單闡明理由，培養(yǎng)學(xué)生的主動(dòng)思維能力和運(yùn)用英語(yǔ)的能力。六、教學(xué)拓展調(diào)查電視節(jié)目的收視率任務(wù)：調(diào)查你周圍的人對(duì)現(xiàn)在各種電視節(jié)目的反響。活動(dòng)過(guò)程：1．教師布置任務(wù)，讓學(xué)生調(diào)查周圍的人（包括他的親戚朋友和鄰居）喜歡收看哪方面的電視節(jié)目。2．學(xué)生進(jìn)行調(diào)查活動(dòng)，運(yùn)用本單元所學(xué)的句型What do you think of….? (Why?)What's your favorite game shows?What do you think of talk show?I doesn’t mind it.I like it.I love it.I can’t stand it.3．記錄下排在前10位的TV Program，填寫調(diào)查表，比較其收視率。
人教版新目標(biāo)初中英語(yǔ)七年級(jí)下冊(cè)Where did you go on vacation教案
句型: Where did you go on vacation? I went to summer camp．Did she go to Central Park？Yes，she did．No, she didn’t語(yǔ)法：一般過(guò)去時(shí)特殊疑問(wèn)句、一般疑問(wèn)句及肯、否定回答。課時(shí)安排4課時(shí)第一課時(shí)：Section A：la，1b，lc，2a，2b，2c 第二課時(shí)：Section A：3a，3b，4第三課時(shí)：Section B：1，2a，2b，2c第四課時(shí)：Section B：3a，3b，3c，4 and Self Check第一課時(shí)教學(xué)目標(biāo)掌握描寫假期生活的形容詞。假期里自己所做事情的簡(jiǎn)單表達(dá)。談?wù)摷倨谧龅氖虑榧爱?dāng)時(shí)情況。談?wù)摷倨跁r(shí)旅游的天氣，旅游者以及食物等。教學(xué)過(guò)程一、導(dǎo)入播放一首英文歌曲：Let’s travel 說(shuō)明：通過(guò)讓學(xué)生聽節(jié)奏歡快迪斯尼英語(yǔ)歌曲Let’s travel.引入本節(jié)課談?wù)摰脑掝}vacation and travel. 讓歌曲使學(xué)生的思維活躍，增強(qiáng)課堂氣氛，激發(fā)學(xué)生提高學(xué)習(xí)英語(yǔ)的興趣。T：How is the trip ?Ss : It’s pretty good/ happy/exciting /relaxing/busy/dangerous/ fantastic說(shuō)明：這個(gè)問(wèn)題是為了操練形容詞。建議讓多個(gè)Ss作答。鼓勵(lì)他們用不同的形容詞。上述個(gè)別形容詞本應(yīng)在第二課時(shí)中出現(xiàn)，但可以在warming-up中第一次非正式出現(xiàn)。這些形容詞也可在老師的評(píng)價(jià)語(yǔ)中適時(shí)出現(xiàn)，以加深學(xué)生對(duì)詞匯的印象。
人教版新目標(biāo)初中英語(yǔ)七年級(jí)下冊(cè)Why do you like koalas教案2篇
單元整體說(shuō)明（一）單元教材分析本單元的核心話題是描述動(dòng)物和表達(dá)個(gè)人喜好，以及句式why do you like…? Because…。這也是本單元的教學(xué)重點(diǎn)。通過(guò)本單元的學(xué)習(xí)，學(xué)生應(yīng)能較流利地運(yùn)用所學(xué)詞匯和句型描述動(dòng)物，表達(dá)個(gè)人喜好。（二）單元知識(shí)結(jié)構(gòu)1．詞匯動(dòng)物名稱 tiger, elephant, koala, dolphin, etc．詞匯描述性形容詞: smart, cute, ugly, clever, shy, etc．國(guó)家名: Australia, South Africa2．句型Why do you like koala hears? Because they are cute．Where are pandas from? They're from China．What animals do you like? I like dolphins．（三）單元整體目標(biāo)1．Master the vocabulary2．Master and use: Why do you like koalas? Because they am cute．Where are pandas from? They're from China．What animals do you like? I like dolphins．（四）單元教學(xué)重難點(diǎn)一覽（五）單元學(xué)情分析學(xué)生此前已經(jīng)學(xué)過(guò)由why, where, what 引導(dǎo)的特殊疑問(wèn)句句型，具有了學(xué)習(xí)本單元知識(shí)的認(rèn)知前提。形形色色的動(dòng)物能激發(fā)學(xué)生的好奇心，產(chǎn)生了解它們的欲望，這有利于本單元知識(shí)的教學(xué)和學(xué)生學(xué)習(xí)興趣的培養(yǎng)。
人教版新目標(biāo)初中英語(yǔ)八年級(jí)下冊(cè)He said I was hard-working教案2篇
This activity introduces some new vocabulary and provide oral practice using the target language.Task 1 . Ask four students to stand in front of the class, and the teacher asks them the following questions as a reporter.1.What are you going to do when you grow up?2.What are you going to do next week?3.What are going to do after school?The students will give different answers, then ask a good student to report what they said.I am going to e a doctor.What did she say?----------She said she was going to be a doctor.I am going to have a party on Friday night.What did he say?-------He said he was going to have a party on Friday night.I am going to do my homework.What did she say ?------ She said she was going to do her homework.I am going home after school.What did she say?-----She said she was going home after school.Say In this unit we are going to learn to use words like to report what someone said.Task 2. Read the instructions. Then ask a student to read the four questions. And write the words on the Bb. Explain what soap opera is.Task 3. Ask the students to Look at the pictures, point out the TV screens in the picture. Ask one girl to read what Marcia said.What did Marcia say? She said She said she was having a surprise party for Lana on Friday night. Repeat the other pictures in the same way.Activity3. Listen and number the pictures in activity 1a.
人教版新目標(biāo)初中英語(yǔ)八年級(jí)下冊(cè)Why don’t you get her a scarf教案
教師帶領(lǐng)學(xué)生復(fù)習(xí)有關(guān)描述寵物的詞匯，采用教師提問(wèn)學(xué)生回答的方進(jìn)行。如：T：What animals do you think would be good pets？What animals do you think would be bad pets？What do you think are good animals for a six-year-old child？然后學(xué)生進(jìn)行 pairwork 練習(xí)。Task two: 師生互動(dòng)，學(xué)習(xí)探究 1、播放3a部分的錄音，引導(dǎo)學(xué)生一邊聽錄音，一邊跟讀。2、通過(guò)聽錄音學(xué)生回答以下問(wèn)題：Why do you think pot-bellied pigs are popular？What are the advantages and disadvantages of keeping such a pet？教師對(duì)學(xué)生的回答進(jìn)行及時(shí)點(diǎn)評(píng)。3．學(xué)習(xí)范文，學(xué)習(xí)重點(diǎn)短語(yǔ)，為下步的模仿寫作提供語(yǔ)言素材。T :1. )Have you ever kept a pig as a pet?Do you like pigs? St.:No.…Why don’t you like to keep a pig? St: No.They’re too dirty and lazy(Do you know in some foreign countries like Hollyland, Australia,pigs are the most popular pet.there’s a kind of pig.(圖)it has an interesting name? it ‘s called a pot-bellied pig.) Now,let’s learn an article about this kind of interesting pet.2.)play the tapeSt.:Listen and repeat3.)show some Qs on computer(本子St.: read silently,then answerthe Qs(本子)4.)Ask ss. Close book and retell this passage.(what is a pot-bellied pig? Is it a good or bad pet? ) St.: retell it to each other“A pot –bellied pig is a popular pet now…”5.read the article together.St.:.practice reading
人教版新目標(biāo)初中英語(yǔ)九年級(jí)下冊(cè)Could you please tell me where the restrooms are教案
Step Ⅰ RevisionCheck homework． Ask a few students to read the article in 3a．Then ask a few students to read their guides．Step Ⅱ Part 1Look at the words in the box． Ask a student to read them． Make sure the students understand the meaning of the words． You are to fill in the blanks with the words． In some cases, students may need to use another form of the word, for example adjusting for tense or subject/ verb agreement．Ask students to fill in the blanks on their own．Check the answers． Step ⅢPart 2Go through the instructions with the class．Look at the example with the students．Ask students what the answer would be．Ask a student to read the question and answer it．Excuse me, could you tell me where the bank is, please?The bank is across the street from the shopping malt．Get students to complete the work in pairs．Check the answers． Ask a few students to read their questions．Step Ⅳ Just for Fun!Ask all the students to read the conversation． Ask: What is funny about this cartoon? Help students to explain． A Martian is a person from the planet Mars．There is no such thing as Martian food on Earth, and the clerk looks silly because he is trying to think of where there is a Martian restaurant．Invite some pairs of students to present this conversation to the rest of the class．Step Ⅴ Summary and HomeworkIn this class, we’ve done much writing practice using the key vocabulary words and the target language presented in this unit． After class, please finish the questions in 2 in your exercise books． Then finish the exercises on pages 47～48 of the workbook as well．The Seventh Period Ⅰ Teaching Aims and Demands1． Knowledge Objects（1） Key Vocabularyimage, adventure, jealousy, hero, crime, journey, brave, no longer, show interest in, take it easy, become interested in, plain looks（2）Text:Grown-ups like cartoons, too．2． Ability Objects（1） Fast-reading to get a general idea of the text．（2） Careful-reading to get the detailed information in the text．
國(guó)旗下的講話稿：清明節(jié)緬懷先烈
以下是關(guān)于國(guó)旗下的講話：清明節(jié)緬懷先烈的文章！尊敬的老師、同學(xué)們：沐浴著溫暖的春風(fēng)，奏響雄渾高亢的《義勇軍進(jìn)行曲》，莊嚴(yán)地升起我們神圣的國(guó)旗，看，五星紅旗，我們心中的圖騰，她熱烈鮮艷，迎風(fēng)飄揚(yáng)。飄揚(yáng)在我們每個(gè)炎黃子孫的心中。今天我們?cè)邗r艷的五星紅旗下，懷著一顆感恩的心，緬懷和紀(jì)念我們的革命先烈。歷史的長(zhǎng)河記載了多少英雄的事跡，革命先烈們，把對(duì)勞苦大眾的愛(ài)化為戰(zhàn)斗時(shí)同敵人搏殺的精神力量，不怕犧牲、勇往直前，建立起人民當(dāng)家作主的新中國(guó)；革命先烈們，在中華民族面臨巨大危險(xiǎn)的時(shí)候，以自己的血肉之軀筑起鋼鐵長(zhǎng)城；革命先烈們，在社會(huì)主義建設(shè)最需要的時(shí)刻，拋去家庭和個(gè)人的一切，毫不猶豫、挺身而出，把寶貴的生命無(wú)私地獻(xiàn)給祖國(guó)和人民，把滿腔的熱血灑遍祖國(guó)的大地。如今，戰(zhàn)爭(zhēng)年代漸行漸遠(yuǎn)，我們這些90后，00后的孩子，過(guò)著無(wú)比幸福的生活，無(wú)法體會(huì)戰(zhàn)爭(zhēng)的困苦與磨難，最多只能從書中，長(zhǎng)輩的教誨和電視劇中去體會(huì)和感悟先烈們這比天高比海深的愛(ài)國(guó)情懷。
大班美術(shù)教案：京劇臉譜（二）
2、 通過(guò)活動(dòng)進(jìn)一步培養(yǎng)幼兒涂色塊的能力，增強(qiáng)美感。準(zhǔn)備：第一次的作品、油畫棒、范例。過(guò)程：一、導(dǎo)如活動(dòng)，引起幼兒活動(dòng)的興趣教師：上次我們畫了各種京劇臉譜，可是還沒(méi)有涂上好看的顏色，先來(lái)看老師畫 的各種臉譜，你們說(shuō)好看嗎？你們知道我是怎樣畫出來(lái)的嗎？想不想使你們的京劇臉譜也畫得和老師一樣好看？幼兒討論。
精編教師個(gè)人新課標(biāo)學(xué)習(xí)心得體會(huì)優(yōu)選例文
我將根據(jù)新的語(yǔ)文能力實(shí)踐系統(tǒng)，致力于學(xué)生語(yǔ)文綜合素質(zhì)的提高，促進(jìn)語(yǔ)文課程的呈現(xiàn)方式和學(xué)生學(xué)習(xí)方式的轉(zhuǎn)變，確立學(xué)生在學(xué)習(xí)中的主體地位，努力給學(xué)生創(chuàng)造一個(gè)有利于素質(zhì)教育的空間?！ ?duì)于小學(xué)語(yǔ)文教學(xué)來(lái)說(shuō)，既要轉(zhuǎn)變教的方式又要轉(zhuǎn)變學(xué)的方式，培養(yǎng)和形成“自主、合作、探究”的學(xué)習(xí)方式，在這兩個(gè)轉(zhuǎn)變中，教的方式轉(zhuǎn)變是主要矛盾。教的方式一轉(zhuǎn)變，學(xué)的方式也隨之轉(zhuǎn)變。學(xué)的方式轉(zhuǎn)變可以理情地在課堂中呈現(xiàn)，證明教的方式轉(zhuǎn)變，證明教師新理念的真正樹立。課改實(shí)踐告訴我們，沒(méi)有堅(jiān)定的新課程理念，真正意義上的教與學(xué)方式的轉(zhuǎn)變是不可能的。把課標(biāo)學(xué)習(xí)與教材教法研究結(jié)合起來(lái)：要鉆研新教材，理解和把握新教材，用好新教材，要重視教學(xué)反思，個(gè)案研究和收集，要牢記驗(yàn)證課標(biāo)和檢驗(yàn)教材的實(shí)驗(yàn)任務(wù)。
初中語(yǔ)文《大自然的語(yǔ)言》試講稿_教案設(shè)計(jì)
竺可楨（1890--1974），浙江上虞人。氣象學(xué)家、地理學(xué)家、教育家。中國(guó)近代地理學(xué)和氣象學(xué)的奠基者。領(lǐng)導(dǎo)創(chuàng)建了我國(guó)第一個(gè)氣象研究所和首批氣象臺(tái)站，并在臺(tái)風(fēng)、季風(fēng)、氣候變遷、農(nóng)業(yè)氣候、物候、自然區(qū)劃等方面有開拓性的研究。創(chuàng)建了我國(guó)第一個(gè)地學(xué)系，成為當(dāng)時(shí)培養(yǎng)地學(xué)英才的搖籃。以求實(shí)精神領(lǐng)導(dǎo)浙江大學(xué)工作，培育了多方面的人才。長(zhǎng)期領(lǐng)導(dǎo)中國(guó)科學(xué)院工作，積極倡導(dǎo)并組織和參加中國(guó)地學(xué)、生物學(xué)、天文學(xué)、自然資源綜合考察及自然科學(xué)史研究等多方面工作，主編了《中國(guó)自然區(qū)劃》、《中國(guó)自然地理》等叢書，是我國(guó)地理學(xué)和氣象學(xué)界的一代宗師。
精編提高團(tuán)隊(duì)執(zhí)行力學(xué)習(xí)個(gè)人心得體會(huì)參考范文
一、要有率先垂范的團(tuán)隊(duì)領(lǐng)導(dǎo)： 領(lǐng)導(dǎo)者是團(tuán)隊(duì)的核心，是團(tuán)隊(duì)的領(lǐng)路人，領(lǐng)導(dǎo)者的執(zhí)行力決定了這個(gè)團(tuán)隊(duì)的執(zhí)行力。領(lǐng)導(dǎo)力就是戰(zhàn)斗力，領(lǐng)導(dǎo)力就是執(zhí)行力！對(duì)領(lǐng)導(dǎo)者而言，執(zhí)行力不只是員工的義務(wù)，更是領(lǐng)導(dǎo)者的責(zé)任。身教勝于言傳，要求員工做到的，領(lǐng)導(dǎo)者必須先做到，正如付老師所言：“要得到什么，就必須先付出什么！。如果領(lǐng)導(dǎo)者有”法不依、有令不行，上有政策、下有對(duì)策，那員工又怎么會(huì)聽從領(lǐng)導(dǎo)的安排?如果說(shuō)領(lǐng)導(dǎo)者能以身作責(zé)、率先垂范，員工上行下效怎么會(huì)執(zhí)行不力?所以說(shuō)，一個(gè)團(tuán)隊(duì)的執(zhí)行力強(qiáng)弱與否，領(lǐng)導(dǎo)者是關(guān)鍵。領(lǐng)導(dǎo)者的一次率先垂范勝過(guò)對(duì)員工一百次蒼白無(wú)力的說(shuō)教！
中班語(yǔ)言課件教案：故事創(chuàng)編表演
二、活動(dòng)的由來(lái)： 三間房子搭建好之后，激起了孩子們表演的欲望，大家一起制作道具分配角色表演起來(lái)了，每個(gè)孩子在表演過(guò)程中都很投入，但發(fā)現(xiàn)孩子在選擇角色時(shí)都喜歡扮演小花豬，由于大灰狼最后的遭遇不好，孩子都不喜歡扮演這個(gè)角色。有的孩子就提出問(wèn)題：“大灰狼可不可以不死呀？”“大灰狼最后跟小豬成了好朋友”“大灰狼也很聰明，它也會(huì)想辦法對(duì)付大灰狼的”。隨著孩子們表演經(jīng)驗(yàn)不斷豐富，他們對(duì)故事的情節(jié)提出了新的要求，要求增加新的角色，于是，決定大家一起來(lái)改編故事并進(jìn)行表演。三、活動(dòng)具體目標(biāo)：（1）創(chuàng)編故事并制訂故事表演的計(jì)劃，并能按計(jì)劃去完成故事表演。（2）能運(yùn)用語(yǔ)調(diào)、表情、動(dòng)作去表現(xiàn)人物的形象和情感變化，發(fā)展幼兒的語(yǔ)感，增強(qiáng)語(yǔ)言的表現(xiàn)力。（3）通過(guò)表演游戲擴(kuò)大詞匯量，積累語(yǔ)言經(jīng)驗(yàn)，在日常生活、交往中遷移運(yùn)用，提高自身的語(yǔ)言能力。（4）培養(yǎng)幼兒自信、勇敢、大方的個(gè)性，能積極主動(dòng)與人交談、協(xié)商、合作與交往。
北師大初中八年級(jí)數(shù)學(xué)下冊(cè)利用四邊形邊的關(guān)系判定平行四邊形教案
解：四邊形ABCD是平行四邊形．證明如下：∵DF∥BE，∴∠AFD＝∠CEB.又∵AF＝CE，DF＝BE，∴△AFD≌△CEB(SAS)，∴AD＝CB，∠DAF＝∠BCE，∴AD∥CB，∴四邊形ABCD是平行四邊形．方法總結(jié)：此題主要考查了平行四邊形的判定，以及三角形全等的判定與性質(zhì)，解題的關(guān)鍵是根據(jù)條件證出△AFD≌△CEB.三、板書設(shè)計(jì)1．平行四邊形的判定定理(1)兩組對(duì)邊分別相等的四邊形是平行四邊形．2．平行四邊形的判定定理(2)一組對(duì)邊平行且相等的四邊形是平行四邊形．在整個(gè)教學(xué)過(guò)程中，以學(xué)生看、想、議、練為主體，教師在學(xué)生仔細(xì)觀察、類比、想象的基礎(chǔ)上加以引導(dǎo)點(diǎn)撥．判定方法是學(xué)生自己探討發(fā)現(xiàn)的，因此，應(yīng)用也就成了學(xué)生自發(fā)的需要，用起來(lái)更加得心應(yīng)手．在證明命題的過(guò)程中，學(xué)生自然將判定方法進(jìn)行對(duì)比和篩選，或?qū)σ活}進(jìn)行多解，便于思維發(fā)散，不把思路局限在某一判定方法上.
北師大初中八年級(jí)數(shù)學(xué)下冊(cè)平行四邊形的判定定理3與兩平行線間的距離教案
(2)∵點(diǎn)G是BC的中點(diǎn)，BC＝12，∴BG＝CG＝12BC＝6.∵四邊形AGCD是平行四邊形，DC＝10，AG＝DC＝10，在Rt△ABG中，根據(jù)勾股定理得AB＝8，∴四邊形AGCD的面積為6×8＝48.方法總結(jié)：本題考查了平行四邊形的判定和性質(zhì)，勾股定理，平行四邊形的面積，掌握定理是解題的關(guān)鍵．三、板書設(shè)計(jì)1．平行四邊形的判定定理3：對(duì)角線互相平分的四邊形是平行四邊形；2．平行線的距離；如果兩條直線互相平行，則其中一條直線上任意一點(diǎn)到另一條直線的距離都相等，這個(gè)距離稱為平行線之間的距離．3．平行四邊形判定和性質(zhì)的綜合．本節(jié)課的教學(xué)主要通過(guò)分組討論、操作探究以及合作交流等方式來(lái)進(jìn)行，在探究?jī)蓷l平行線間的距離時(shí)，要讓學(xué)生進(jìn)行合作交流．在解決有關(guān)平行四邊形的問(wèn)題時(shí)，要根據(jù)其判定和性質(zhì)綜合考慮，培養(yǎng)學(xué)生的邏輯思維能力.
北師大初中九年級(jí)數(shù)學(xué)下冊(cè)二次函數(shù)y=ax2+bx+c的圖象與性質(zhì)1教案
解析：(1)已知拋物線解析式y(tǒng)＝ax2＋bx＋0.9，選定拋物線上兩點(diǎn)E(1，1.4)，B(6，0.9)，把坐標(biāo)代入解析式即可得出a、b的值，繼而得出拋物線解析式；(2)求出y＝1.575時(shí)，對(duì)應(yīng)的x的兩個(gè)值，從而可確定t的取值范圍．解：(1)由題意得點(diǎn)E的坐標(biāo)為(1，1.4)，點(diǎn)B的坐標(biāo)為(6，0.9)，代入y＝ax2＋bx＋0.9，得a＋b＋0.9＝1.4，36a＋6b＋0.9＝0.9，解得a＝－0.1，b＝0.6.故所求的拋物線的解析式為y＝－0.1x2＋0.6x＋0.9；(2)157.5cm＝1.575m，當(dāng)y＝1.575時(shí)，－0.1x2＋0.6x＋0.9＝1.575，解得x1＝32，x2＝92，則t的取值范圍為32＜t＜92.方法總結(jié)：解答本題的關(guān)鍵是注意審題，將實(shí)際問(wèn)題轉(zhuǎn)化為求函數(shù)問(wèn)題，培養(yǎng)自己利用數(shù)學(xué)知識(shí)解答實(shí)際問(wèn)題的能力．三、板書設(shè)計(jì)二次函數(shù)y＝ax2＋bx＋c的圖象與性質(zhì)1．二次函數(shù)y＝ax2＋bx＋c的圖象與性質(zhì)2．二次函數(shù)y＝ax2＋bx＋c的應(yīng)用
北師大初中九年級(jí)數(shù)學(xué)下冊(cè)二次函數(shù)y=ax2+bx+c的圖象與性質(zhì)2教案
1．使學(xué)生掌握用描點(diǎn)法畫出函數(shù)y＝ax2＋bx＋c的圖象。2．使學(xué)生掌握用圖象或通過(guò)配方確定拋物線的開口方向、對(duì)稱軸和頂點(diǎn)坐標(biāo)。讓學(xué)生經(jīng)歷探索二次函數(shù)y＝ax2＋bx＋c的圖象的開口方向、對(duì)稱軸和頂點(diǎn)坐標(biāo)以及性質(zhì)的過(guò)程，理解二次函數(shù)y＝ax2＋bx＋c的性質(zhì)。用描點(diǎn)法畫出二次函數(shù)y＝ax2＋bx＋c的圖象和通過(guò)配方確定拋物線的對(duì)稱軸、頂點(diǎn)坐標(biāo)理解二次函數(shù)y＝ax2＋bx＋c(a≠0)的性質(zhì)以及它的對(duì)稱軸(頂點(diǎn)坐標(biāo)分別是x＝－b2a、(－b2a，4ac－b24a)一、提出問(wèn)題1．你能說(shuō)出函數(shù)y＝－4(x－2)2＋1圖象的開口方向、對(duì)稱軸和頂點(diǎn)坐標(biāo)嗎？(函數(shù)y＝－4(x－2)2＋1圖象的開口向下，對(duì)稱軸為直線x＝2，頂點(diǎn)坐標(biāo)是(2，1)。2．函數(shù)y＝－4(x－2)2＋1圖象與函數(shù)y＝－4x2的圖象有什么關(guān)系?(函數(shù)y＝－4(x－2)2＋1的圖象可以看成是將函數(shù)y＝－4x2的圖象向右平移2個(gè)單位再向上平移1個(gè)單位得到的)
北師大初中九年級(jí)數(shù)學(xué)下冊(cè)二次函數(shù)y=x2和y=-x2的圖象與性質(zhì)2教案
【教學(xué)目標(biāo)】(一)教學(xué)知識(shí)點(diǎn)能夠利用描點(diǎn)法作出函數(shù) 的圖象，并根據(jù)圖象認(rèn)識(shí)和理解二次函數(shù) 的性質(zhì)；比較兩者的異同.(二)能力訓(xùn)練要求：經(jīng)歷探索二次函數(shù) 圖象的作法和性質(zhì)的過(guò)程，獲得利用圖象研究函數(shù)性質(zhì)的經(jīng)驗(yàn).（三）情感態(tài)度與價(jià)值觀：通過(guò)學(xué)生自己的探索活動(dòng)，達(dá)到對(duì)拋物線自身特點(diǎn)的認(rèn)識(shí)和對(duì)二次函數(shù)性質(zhì)的理解. 【重、難點(diǎn)】重點(diǎn) ：會(huì)畫y=ax2的圖象，理解其性質(zhì)。難點(diǎn)：描點(diǎn)法畫y=ax2的圖象，體會(huì)數(shù)與形的相互聯(lián)系。 【導(dǎo)學(xué)流程】 一、自主預(yù)習(xí)（用時(shí)15分鐘）1.創(chuàng)設(shè)教學(xué)情境我們?cè)诮虒W(xué)了正比例函數(shù)、一次函數(shù)、反比例函數(shù)的定義后，都借助圖像研究了它們的性質(zhì).而上節(jié)課我們所學(xué)的二次函數(shù)的圖象是什么呢？本節(jié)課我們將從最簡(jiǎn)單的二次函數(shù)y=x2入手去研究
北師大初中九年級(jí)數(shù)學(xué)下冊(cè)二次函數(shù)y=a(x-h)2+k的圖象與性質(zhì)1教案
(3)設(shè)點(diǎn)A的坐標(biāo)為(m，0)，則點(diǎn)B的坐標(biāo)為(12－m，0)，點(diǎn)C的坐標(biāo)為(12－m，－16m2＋2m)，點(diǎn)D的坐標(biāo)為(m，－16m2＋2m)．∴“支撐架”總長(zhǎng)AD＋DC＋CB＝(－16m2＋2m)＋(12－2m)＋(－16m2＋2m)＝－13m2＋2m＋12＝－13(m－3)2＋15.∵此二次函數(shù)的圖象開口向下，∴當(dāng)m＝3米時(shí)，“支撐架”的總長(zhǎng)有最大值為15米．方法總結(jié)：解決本題的關(guān)鍵是根據(jù)圖形特點(diǎn)選取一個(gè)合適的參數(shù)表示它們，得出關(guān)系式后運(yùn)用函數(shù)性質(zhì)來(lái)解．三、板書設(shè)計(jì)二次函數(shù)y＝a(x－h(huán))2＋k的圖象與性質(zhì)1．二次函數(shù)y＝a(x－h(huán))2＋k的圖象與性質(zhì)2．二次函數(shù)y＝a(x－h(huán))2＋k的圖象與y＝ax2的圖象的關(guān)系3．二次函數(shù)y＝a(x－h(huán))2＋k的應(yīng)用要使課堂真正成為學(xué)生展示自我的舞臺(tái)，還學(xué)生課堂學(xué)習(xí)的主體地位，教師要把激發(fā)學(xué)生學(xué)習(xí)熱情和提高學(xué)生學(xué)習(xí)能力放在教學(xué)首位，為學(xué)生提供展示自己聰明才智的機(jī)會(huì)，使課堂真正成為學(xué)生展示自我的舞臺(tái)．充分利用合作交流的形式，能使教師發(fā)現(xiàn)學(xué)生分析問(wèn)題、解決問(wèn)題的獨(dú)到見解以及思維的誤區(qū)，以便指導(dǎo)今后的教學(xué).