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北師大初中七年級數(shù)學下冊利用“角邊角”“角角邊”判定三角形全等教案
1．理解并掌握三角形全等的判定方法——“角邊角”“角角邊”；(重點)2．能運用“角邊角”“角角邊”判定方法解決有關(guān)問題．(難點) 一、情境導入如圖所示，某同學把一塊三角形的玻璃不小心打碎成了三塊，現(xiàn)在要到玻璃店去配一塊完全一樣的玻璃，那么最省事的辦法是帶哪塊去？學生活動：學生先自主探究出答案，然后再與同學進行交流．教師點撥：顯然僅僅帶①或②是無法配成完全一樣的玻璃的，而僅僅帶③則可以，為什么呢？本節(jié)課我們繼續(xù)研究三角形全等的判定方法．二、合作探究探究點一：全等三角形判定定理“ASA”如圖，AD∥BC，BE∥DF，AE＝CF，試說明：△ADF≌△CBE.解析：根據(jù)平行線的性質(zhì)可得∠A＝∠C，∠DFE＝∠BEC，再根據(jù)等式的性質(zhì)可得AF＝CE，然后利用“ASA”可得到△ADF≌△CBE.
北師大初中九年級數(shù)學下冊解直角三角形1教案
方法總結(jié)：解答此類題目的關(guān)鍵是根據(jù)題意構(gòu)造直角三角形，然后利用所學的三角函數(shù)的關(guān)系進行解答．變式訓練：見《學練優(yōu)》本課時練習“課后鞏固提升” 第7題【類型三】 構(gòu)造直角三角形解決面積問題在△ABC中，∠B＝45°，AB＝2，∠A＝105°，求△ABC的面積．解析：過點A作AD⊥BC于點D，根據(jù)勾股定理求出BD、AD的長，再根據(jù)解直角三角形求出CD的長，最后根據(jù)三角形的面積公式解答即可．解：過點A作AD⊥BC于點D，∵∠B＝45°，∴∠BAD＝45°，∴AD＝BD＝22AB＝22×2＝1.∵∠A＝105°，∴∠CAD＝105°－45°＝60°，∴∠C＝30°，∴CD＝ADtan30°＝133＝3，∴S△ABC＝12(CD＋BD)·AD＝12×(3＋1)×1＝3＋12. 方法總結(jié)：解答此類題目的關(guān)鍵是根據(jù)題意構(gòu)造直角三角形，然后利用所學的三角函數(shù)的關(guān)系進行解答．
北師大初中九年級數(shù)學下冊利用三角函數(shù)測高2教案
問題2、如何用測角儀測量一個低處物體的俯角呢?和測量仰角的步驟是一樣的，只不過測量俯角時，轉(zhuǎn)動度盤，使度盤的直徑對準低處的目標，記下此時鉛垂線所指的度數(shù)，同樣根據(jù)“同角的余角相等”，鉛垂線所指的度數(shù)就是低處的俯角.活動三：測量底部可以到達的物體的高度.“底部可以到達”，就是在地面上可以無障礙地直接測得測點與被測物體底部之間的距離.要測旗桿MN的高度，可按下列步驟進行：(如下圖)1.在測點A處安置測傾器(即測角儀)，測得M的仰角∠MCE=α.2.量出測點A到物體底部N的水平距離AN＝l.3.量出測傾器(即測角儀)的高度AC＝a(即頂線PQ成水平位置時，它與地面的距離).根據(jù)測量數(shù)據(jù)，就能求出物體MN的高度.在Rt△MEC中，∠MCE=α，AN=EC=l，所以tanα= ，即ME=tana·EC＝l·tanα.又因為NE＝AC＝a，所以MN＝ME+EN＝l·tanα+a.
人教部編版語文九年級下冊蒲柳人家（節(jié)選）教案
劉紹棠，中國當代著名鄉(xiāng)土文學作家，1936年2月出生于河北通縣（今北京通州區(qū)）大運河畔的儒林村，1949年開始發(fā)表作品，一生留下了500多萬字的鄉(xiāng)土文學作品，包括《地火》《京門臉子》等多部長篇小說，《蒲柳人家》《運河的槳聲》等多部中篇小說，以及《青枝綠葉》《蛾眉》等多部短篇小說集。他的作品在國內(nèi)多次獲獎，在國際上亦有影響。劉紹棠的作品內(nèi)容各不相同，但都藝術(shù)地再現(xiàn)了其家鄉(xiāng)大運河畔不同歷史時期的風土人情和社會風貌，描繪了充滿詩情畫意的鄉(xiāng)風水色、世俗人情。20世紀80年代以來，劉紹棠不遺余力地倡導鄉(xiāng)土文學，創(chuàng)作上堅持“中國氣派，民族風格，地方特色，鄉(xiāng)土題材”。文學評論家指出，他的作品格調(diào)清新淳樸，鄉(xiāng)土色彩濃郁，形成了獨具特色的大運河鄉(xiāng)土文學風格。
人教部編版語文八年級下冊慶祝奧林匹克運動復興25周年教案
（3）推薦男女生代表各一位在全班進行演講展示。 （4）圍繞“講”和“演”兩方面的技巧，點評演講效果。（生開展演講活動，師指導）【設計意圖】本環(huán)節(jié)通過集中梳理演講技巧，并設計演講技巧進行演講展示，引導學生將理論知識逐步運用于具體的演講實踐中，提高學生的演講能力。五、總結(jié)存儲1.教師總結(jié)現(xiàn)代奧林匹克運動的創(chuàng)始人顧拜旦面對世界政治格局劇變的局面，以戰(zhàn)略家的視野指出奧林匹克精神的內(nèi)涵與價值，用詩歌般的語言闡述了奧林匹克平和自信的內(nèi)涵，提出了奧林匹克運動的宗旨是教育，是面向大眾，是促進和平、公平、公正。他激情澎湃地暢想美好前景，確信奧林匹克精神必將如陽光般普照大地。整篇演講詞站位高、格局廣，語言莊重、典雅，值得我們用心體會。2.布置作業(yè)學校即將舉行春季運動會，如果你被邀請在運動會的開幕式上作為學生代表發(fā)言，你將如何演講？結(jié)合你對奧林匹克運動的精神的理解，寫一篇300字左右的演講詞，并適當設計一些演講技巧。
部編人教版四年級下冊《 納米技術(shù)就在我們身邊》創(chuàng)新教案
【教學理念】 1.整體感知課文內(nèi)容，理清文章思路。2.培養(yǎng)學生篩選信息能力，了解納米的有關(guān)知識和應用前景。3.激發(fā)科學興趣，培養(yǎng)學生勇于大膽想象的科學精神?！窘虒W流程】一、談話引入，激發(fā)興趣。1．今天我們來學習一篇新課文《納米技術(shù)就在我們身邊》（板書課題）。2．以前聽說過“納米技術(shù)”嗎？你了解納米技術(shù)嗎？是怎么了解到的？預設：我通過預習課文了解到“納米技術(shù)”就是研究小小物質(zhì)新奇特性的一門學問。預設：我是通過查找資料了解什么是納米，什么是納米技術(shù)的。二、通讀課文，了解大意。1.檢查課文朗讀。出示課文中的科技術(shù)語和句子。先組內(nèi)相互聽讀糾正，然后全班交流。詞語：除臭技術(shù) 納米緩釋技術(shù) 長度單位 納米涂層 碳納米管 納米吸波材料 探測雷達波。句子：納米技術(shù)就是研究并利用這些特性造福于人類的一門新學問。2．自由交流：讀了課文，你知道了什么？
部編人教版四年級下冊《 納米技術(shù)就在我們身邊》教案
一、圖片導入,激發(fā)興趣。1.導語:大家還記得在科幻世界里那些隨意消失變化的人嗎？還記得在神話世界里，孫悟空的七十二變嗎？現(xiàn)在所有這一切都不是在瘋狂的科幻世界里，不是在神奇的神話里，而是在離我們也許只有幾年之遙的納米時代！那么什么是納米？什么是納米技術(shù)？大家想不想了解有關(guān)這方面的知識？2.展示圖片:【課件出示2】圖1.納米機器人（描述的是一個納米機器人在清理血管中的有害堆積物。由于納米機器人可以小到在人的血管中自由地游動，對于像腦血栓、動脈硬化等病灶，它們可以非常容易地予以清理，而不再用進行危險的開顱、開胸手術(shù)。）圖2.納米技術(shù)制作的中國地圖（這是中國科學院化學所的科技人員，利用納米加工技術(shù)在石墨表面，通過搬遷碳原子而繪制出的世界上最小的中國地圖。這幅地圖到底有多小呢？打個比方吧，如果把這幅圖放大到一張一米見方的中國地圖大小的尺寸，就相當于把該幅地圖放大到中國遼闊的領(lǐng)土的面積。）
人教版新目標初中英語七年級下冊How was your weekend教案2篇
Teaching Goal:1. General aims:Talk about recent past events2. Particular aims:A. Language Focus.Talk about recent past events and think of the past events.B. Language goalsHow was….?It was …What did …do over the weekend?C. Language structures:(1). How was your weekend? I was great. Pay attention to no form.(2). What did you do over the weekend? I played soccer. We went to the beach.D. Useful words and phrases:Words: was, did, went, beach, over, project, test, wasn’t, false, number, geography, spend, week, most, mixture, their, had, little, cook, read, saw, change, everyone, sit, sat, no, anythingPhrases: did one’s homework, played soccer, cleaned my room, went to the beach, played tennis, went to the movies, on Saturday morning, over the weekend, cook … for, what about, do some reading, have a party, talk show, go shoppingE. Grammar language:Present simple past tenseRegular and irregular verbsF. Learning strategies:Tour and holidaysG. Interdiscipinary:H. Emotion and manner:Teaching time: 5 periodsTeaching procedures:Period One教學步驟、時間 教師活動 學生活動 媒體應用Step 1Free talk 3’ Ask some questions like:Who’s on duty today?What’s the weather like? Answer and talk about something.讓同學們回答下列問題1. Do you like weekend? (Let some students answer)It takes them three minutes to talk about the question.2. Why do you like weekend? (let the students answer) Most of the students like the weekend此時教師用漢語問：“在周末期間問你干了什么?這句話用英語這么回答?Let the students guess.At last the teacher give them right answer3. What did you do over the weekend?(板書、學習)
人教版新目標初中英語七年級下冊What does he look like教案3篇
所需要用到的句子：Who is that?That is Jack. I like him.Why do you like him?I like him because he is interesting.Task 4: 設計理想中的人類Step one: 設計理想中的人類的外貌。把全班同學分成若干小組，學生可以邊說邊在紙上畫出他們的模樣。Step two: 設計理想中人類的性格。學生們可以把那些能描述性格的單詞寫在圖畫的旁邊。Step three: 每組選出一名同學，其他同組同學提問，他作簡單回答，并說明原因。所需用到的句子：What does he or she look like?He or she ...What is he or she like?He or she is ...Why?Because ...Task 5: 挑戰(zhàn)性活動調(diào)查性格是天生的還是后天形成的，讓每個同學回家去調(diào)查一下自己成長過程中性格是否有變化，具體是怎樣的，為什么會這樣？ Teaching Aims:1. Enable students to have a general understanding of how to talk about people's physical appearance.2. Enable students to tackle some essential vocabularies and patterns about describing people. Provide them with necessary skills and methods.3. Create various chances for students to describe the persons they're familiar with, such as classmates, family members, teachers, idols, etc.
人教版新目標初中英語七年級下冊Where is the post office教案2篇
Period 2 (3a----Section B 2c)Preview(Pre-task): Key points: What laAdd another information about their pen pals----their language on the cardnguage does she/he speak?She/He speaks....Does she/he have any brothers and sisters? Does she/he speak English?Preview(Pre-task): Add another information about their pen pals----their language on the cardKey points: What language does she/he speak?She/He speaks....Does she/he have any brothers and sisters? Does she/he speak English?Step 1 Revision1.Revisionand dictation of the new words 2.Revise the drills they learned yesterday.(by pairwork and grammar exercise)Step 2 Leading-inT has a conversation with one student. The conversation is following:---Do you have a pen pal?---Yes, I do.---What's your pen pal's name? ---His/Her name is....---Where is your pen pal from? ---He/She is from...---Where does he/she live? ---He/She lives in....---What language does he/she speak?He/She speaks...Write the new words on the Bb. They are following: EnglishChineseJapaneseFrenchStep 3 LearnLearn the new words with the whole class.Finish 3a with the students3b Pairwork T still does an example with one student Then the Ss practise in pairs. The example is following:--Curry Muray is my pen pal. He is from the United States.---What language does he speak?
人教版新目標初中英語七年級下冊I ’d like some noodles教案
教學過程Step 1: warming-up Sing a song---------“food and drink” Step 2: Revision1 Dictation2 Revise: What kind of noodles would you like?I’d like …What size bowl of noodles would you like?I’d like…Step 3: Presentation1 show pictures of food, ask students say the words.2 Students read the newspaper ad in 3a. Fill in blanks with words in the box. Then read the ad together, the teacher explains some difficult language points.3 Check the answers Step 4 PracticeAsk students to finish 3b in the same way according to 3a. Students read the short passage and fill in the blanks .At last, check the answers.Step 5 productionAsk students to write their own ad for dumplings, noodles, drinks, and other foods they know. Then ask students to read their partner’s ad. Then order food and drink from their partner.Step 6 Home workGroup work – make an ad about “food and drink”
人教版新目標初中英語七年級下冊I want to be an actor教案2篇
三、教學建議第一課時：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.
人教版新目標初中英語七年級下冊It’s raining教案2篇
1 Each group choose one place to describe and what you are doing in it Choose one place, and describe what they are doing 2 Move around the room and give suggestions Talk about it and write it down 3 Ask one to show their works and act it Choose one of each group to make a report 4 Evaluate the best group and the best reporter Choose the best one Homework Ask your friends their ideal place and write about it教學反思：新課程標準中強調(diào)學生在課堂中的主體地位，在綜合課中他們的主體地位就更加突出。在各個活動中給不同程度的學生不同層次的任務，讓各層面的學生都有表現(xiàn)發(fā)揮的機會，從而產(chǎn)生對英語的興趣。使用照片圖片多媒體來輔助教學，效果更好。同時讓了解其他國家風景，風俗的同學介紹ideal place，增加學生的背景知知識，實現(xiàn)跨學科交流的目的。教案點評：采用任務型教學模式，在各個活動中給不同程度的學生不同層次的任務，讓各層面的學生都有表現(xiàn)發(fā)揮的機會，從而產(chǎn)生對英語的興趣。使用照片圖片多媒體來輔助教學，效果更好。讓了解其他國家風景，風俗的同學介紹ideal place，增加學生的背景知識，實現(xiàn)跨學科交流的目的。
人教版新目標初中英語七年級下冊What do you think of game shows教案
五、教學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.說明：這一步旨在讓學生運用已有的語言知識談論對事物的看法和意見，并簡單闡明理由，培養(yǎng)學生的主動思維能力和運用英語的能力。六、教學拓展調(diào)查電視節(jié)目的收視率任務：調(diào)查你周圍的人對現(xiàn)在各種電視節(jié)目的反響。活動過程：1．教師布置任務，讓學生調(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．學生進行調(diào)查活動，運用本單元所學的句型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。
人教版新目標初中英語七年級下冊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語法：一般過去時特殊疑問句、一般疑問句及肯、否定回答。課時安排4課時第一課時：Section A：la，1b，lc，2a，2b，2c 第二課時：Section A：3a，3b，4第三課時：Section B：1，2a，2b，2c第四課時：Section B：3a，3b，3c，4 and Self Check第一課時教學目標掌握描寫假期生活的形容詞。假期里自己所做事情的簡單表達。談論假期做的事情及當時情況。談論假期時旅游的天氣，旅游者以及食物等。教學過程一、導入播放一首英文歌曲：Let’s travel 說明：通過讓學生聽節(jié)奏歡快迪斯尼英語歌曲Let’s travel.引入本節(jié)課談論的話題vacation and travel. 讓歌曲使學生的思維活躍，增強課堂氣氛，激發(fā)學生提高學習英語的興趣。T：How is the trip ?Ss : It’s pretty good/ happy/exciting /relaxing/busy/dangerous/ fantastic說明：這個問題是為了操練形容詞。建議讓多個Ss作答。鼓勵他們用不同的形容詞。上述個別形容詞本應在第二課時中出現(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價語中適時出現(xiàn)，以加深學生對詞匯的印象。
人教版新目標初中英語七年級下冊Why do you like koalas教案2篇
單元整體說明（一）單元教材分析本單元的核心話題是描述動物和表達個人喜好，以及句式why do you like…? Because…。這也是本單元的教學重點。通過本單元的學習，學生應能較流利地運用所學詞匯和句型描述動物，表達個人喜好。（二）單元知識結(jié)構(gòu)1．詞匯動物名稱 tiger, elephant, koala, dolphin, etc．詞匯描述性形容詞: smart, cute, ugly, clever, shy, etc．國家名: 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）單元教學重難點一覽（五）單元學情分析學生此前已經(jīng)學過由why, where, what 引導的特殊疑問句句型，具有了學習本單元知識的認知前提。形形色色的動物能激發(fā)學生的好奇心，產(chǎn)生了解它們的欲望，這有利于本單元知識的教學和學生學習興趣的培養(yǎng)。
人教版新目標初中英語八年級下冊Have you ever been to an amusement park教案
（1）Have you ever been to …? Yes, I have. / Yes, I have ever been to …No, I haven’t. / No, I have never been to …（2）When did you go there? I went there last year. （3）I have never been to a water park. Neither have I. I have ever been to an amusement park. So have I. （4）How long have you been studying English? I’ve been studying English since nine o’clock. I’ve been studying English since I came back home. I’ve been studying English for five hours. （5）What’s that? It’s an amusement park in Japan. I’ve never been to an amusement park like it before. It’s fun to learn another language. Let’s go tonight. Isn’t this great?space museum, amusement park, water park, South America, Peru, Holland, European culture, tour guide, flight attendant, musical instrument, more than, be from, get to, take lessons, neither, discover, graduate, change
人教版新目標初中英語八年級下冊If you go to the party, you’ll have a great time教案2篇
區(qū)分賓語從句、定于從句和狀語從句賓語從句和狀語從句，都叫做主從復合句。賓語從句主要是中考必考的，是初中階段必掌握的從句，賓語從句主要是掌握三要素，所謂賓語從句，就是賓語在主從復合句當中充當賓語的一個句子，叫做賓語從句。主句的謂語動詞是及物動詞，后面如果是詞或者是短語的話，是簡單句，如果是句子的話，肯定是賓語從句。I know that he good at English.就是賓語從句，三要素，一要素是要注意連詞，連詞一共學了三類連詞，一類連詞是that口語當中可以省略，就像剛才說的那一句，I hear he is good at English.還有疑問代詞、疑問副詞，how where when，疑問代詞、疑問副詞。還有一類連詞weather是否的意思，不是狀語從句當中的如果，這一定要和如果區(qū)分開，這是是否。I don't know if he interested at English。賓語從句要注意if是連詞。第二要素是語序，要用陳述舉語序。比如說你家有幾口人，我們都說How many people are there in you family?但是這是簡單句，一旦說成賓語從句，你可以告訴我你家有幾口人嗎？Could you tell me how many people there are in you family ?
人教版新目標初中英語八年級下冊It’s a nice day, isn’t it教案2篇
"Hello! Welcome to English class! Introduce yourself. Meet your new classmates." That's what the teacher says. What do you say? "Oh no!" It can be difficult talking to new people. But it can be fun, and you can make friends. How do you do it? Make small talk. Small talk is polite conversation. "Wang Nan is a great pingpang player, isn't she?" "I'd love to meet her, wouldn't you?" "It's been raining a lot, hasn't it?" Tag questions are a form of polite speech. To make small talk successfully, you should know how to make them. You should also know what topics to talk about. Try to learn this unit carefully. The next time you're in English class, you'll find out. Making small talk's easy, isn't it? (“你好！歡迎你！請做一下自我介紹。認識一下你的新同學?！蓖ǔＴ谡n上老師會這樣說。你會說什么呢？“噢，不！”與陌生人談話太困難了。但是這也很有意思，并且你還能交到朋友。你該怎么做呢？閑聊。閑聊指得是禮貌的對話?！巴蹰且粋€很棒的乒乓球運動員，不是嗎？”“我希望自己能認識她，你呢？“今年的雨水很多，不是嗎？”反意疑問句是一種禮貌用語。為了使得談話成功，你應該知道怎樣去進行閑聊。你還應該知道與不同的人該談論什么樣的話題。認真的學習這個單元吧，下次在英語課上，你會發(fā)現(xiàn)與大家展開談話是一件很容易的事情，不信我們來試試。)
人教版新目標初中英語八年級下冊How long have you been collecting shells教案2篇
Step Ⅱ Show the new words on the screen and teach the new words. Read the new words to students and ask them to repeat.Step Ⅲ 3aThis activity introduces new vocabulary and provides reading practice using the target language.In this activity first look at the four pictures.T: What can you see in the pictures?Ss: Four snow globes.T: Right. There are four snow globes in the pictures. And what are they?Ss: They are a monster, two polar bears, two penguins and a birthday cake.Write these words on the blackboard: snow globe; monster; polar bear; penguin and birthday cake. Read them to the class and ask students to repeat each one. Make sure students understand each word.Use a computer to show the E-mail message on the screen and read the message to students.Get students to read the e-mail on their own, and then draw lines connecting each snow globe and its description.Correct the answers.AnswersA line should connect each snow globe picture with the words that describe it in the letter.Step Ⅳ 3bThis activity provides writing practice using the target language.First review Activity 2a on Page 47.Then ask students to complete the message according to Activity 2a.Some partial sentences are given to students. Write about one person's collection.When students work, walk around the room checking the progress and offering help as needed.When they finish, ask some students to read their messages to the class.
