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初中生物北師大版七年級下冊《第14章第1節(jié)人類活動對生物圈的影響》教案

  • 二年級數(shù)學(xué)下冊第四單元表內(nèi)除法教案

    二年級數(shù)學(xué)下冊第四單元表內(nèi)除法教案

    1、 談話引入新課六一快到了。小朋友們在老師的帶領(lǐng)下忙著布置自己的教室呢!可是他們遇到了一些數(shù)學(xué)上的問題,你能幫他們一快解決嗎?2、教學(xué)例1。(1)、投影出示主題圖引導(dǎo)學(xué)生仔細觀察。說說他們遇到了什么問題?(2)、引導(dǎo)學(xué)生解決問題并列出算式。板書:56÷8(3)、引導(dǎo)學(xué)生得出算式的商。問:你是怎么計算的?(想乘算除)(4)、學(xué)生獨立解決:要是掛7行呢?你能夠解決嗎?學(xué)生說出自己的計算結(jié)果,并把求商的過程跟大家說一說。2、 小結(jié):在今天的學(xué)習(xí)中我們不僅幫小朋友們解決了數(shù)學(xué)問題,而且還進一步學(xué)會了利用乘法口訣來求商。在以后的除法中只要大家能夠熟記口訣,就能很快算出除法的商了。

  • 二年級數(shù)學(xué)下冊第五單元混合運算教案

    二年級數(shù)學(xué)下冊第五單元混合運算教案

    一、創(chuàng)設(shè)情境,導(dǎo)入新課   1、老師有一個好消息要告訴大家,在動物學(xué)校的旁邊開了一家超市,森林里的小動物們都去那兒購物。今天,小熊哥倆正在商店里購物呢!你想看看嗎?   2、教師出示情境圖,教師板書課題:小熊購物二、自主探究新知   1、解決第(1)個問題“小熊該付多少錢?”   1)“仔細觀察情境圖,你能發(fā)現(xiàn)哪些數(shù)學(xué)信息?”,教師總結(jié)重要數(shù)學(xué)信息。   2)“ 大家看小熊說的話,你能提出什么問題?” 引出“小熊該付多少錢?”這個問題?! ?3),教師巡視搜集學(xué)生出現(xiàn)的不同做法   4)展示學(xué)生作業(yè),并引導(dǎo)其他學(xué)生質(zhì)疑“第二個算式是什么意思?”若學(xué)生中不出現(xiàn)第二個算式,教師引導(dǎo)學(xué)生將兩個算式合在一起?! ?5)脫式計算:根據(jù)學(xué)生列出的算式,教師結(jié)合算式指導(dǎo)學(xué)生進行脫式計算,規(guī)范學(xué)生的書寫格式。

  • 二年級數(shù)學(xué)下冊第八單元克和千克教案

    二年級數(shù)學(xué)下冊第八單元克和千克教案

    1、拿出一本數(shù)學(xué)教課書,和一只筆,提問:哪個重有些?2、肯定學(xué)生的回答,并讓學(xué)生“掂一掂”,然后讓學(xué)生說說有什么樣的感覺。3、從剛才的實踐得出結(jié)論:物體有輕有重。板書課題。二、觀察、操作領(lǐng)悟新知1、出示主題掛圖,物體的輕重的計量。觀察主題掛圖。(1、)請同學(xué)們觀察一下,這幅圖畫的是什么?(2、)這幅圖中的小朋友和阿姨在說什么?(3、)前幾天,老師讓大家廣泛收集、調(diào)查我們?nèi)粘I钪谐R娢锲返馁|(zhì)量,我們現(xiàn)在來交流以下好嗎?表示物品有多重,可以用克和千克單位來表示。(4、)在學(xué)生說的同時,老師拿出有準(zhǔn)備的東西展示。

  • 二年級數(shù)學(xué)下冊第九單元數(shù)學(xué)廣角推理教案

    二年級數(shù)學(xué)下冊第九單元數(shù)學(xué)廣角推理教案

    1,猜一猜 師:這里有一個盒子,盒子里有一朵花,誰能猜出這朵花是什么顏色的?盒子里的花兒的顏色是確定的,為什么你們會有那么多不同的答案? ……師:好,老師給一個提示:紅色和黃色。會是什么顏色呢?師:要想準(zhǔn)確猜出球的顏色,有一個統(tǒng)一的答案,怎么辦? 師:滿足你的愿望,第二個提示:不是紅色的。2、猜球游戲: 小朋友看,老師這里有一個白色和一個黃色的乒乓球,現(xiàn)在把它們放到盒子里,我們一起來玩一個猜一猜的游戲,好嗎? 師:我摸出其中一個,你猜猜是什么顏色的球呢?師:猜得準(zhǔn)嗎?老師給你們一些提示吧:我摸出的不是黃球,那我摸出的是什么顏色的球?你是怎么猜的?師:那盒子里面的是什么顏色的球呢?你是怎么猜的?小朋友們很聰明,根據(jù)老師的提示能準(zhǔn)確地判斷出球的顏色,這種方法就是我們今天要學(xué)習(xí)的簡單的推理。

  • 二年級數(shù)學(xué)下冊第一單元數(shù)據(jù)收集整理教案

    二年級數(shù)學(xué)下冊第一單元數(shù)據(jù)收集整理教案

    問題情景,導(dǎo)入新課1、多媒體課件出示例1主題圖,問:圖上的小朋友在干什么?你們測量過體重嗎?測量了幾次?讀一年級剛?cè)雽W(xué)時,你測量的體重是多少?(學(xué)生自由匯報各自的體重情況)怎樣才能讓大家一看就明白我們班所有人的體重情況呢?二、活動體驗,探究新知1、電腦出示統(tǒng)計表(1): 體重(千克)15以下16~20 21~25 26~30 31以上人數(shù) 師:現(xiàn)在我們就用“正”字記錄法來統(tǒng)計一下剛?cè)雽W(xué)時的體重(集體活動)2、活動結(jié)束后,師生共同將收集的數(shù)據(jù)整理后填入表格中。3、二年級時,我們的體重有什么變化呢? 電腦出示統(tǒng)計表(2) 體重(千克)15以下16~20 21~25 26~30 31以上人數(shù) 集體進行統(tǒng)計活動,并將結(jié)果填入表中。4、討論:如果想把兩年的體重數(shù)據(jù)填入一個統(tǒng)計表中,該如何表示呢? 學(xué)生討論后,在黑板上出示表格(3):(單位:千克)

  • 人教部編版七年級下冊說和做——記聞一多先生言行片段教案

    人教部編版七年級下冊說和做——記聞一多先生言行片段教案

    【設(shè)計意圖】這個環(huán)節(jié)的設(shè)計是在學(xué)生掌握了學(xué)法的基礎(chǔ)上,放手讓學(xué)生自主學(xué)習(xí),從而真正做到“將課堂還給學(xué)生”。這樣的設(shè)計不僅充分激發(fā)了學(xué)生的學(xué)習(xí)興趣,而且更能促使學(xué)生真正掌握初步分析人物形象的方法。四、聯(lián)系實際,拓展延伸1.作者臧克家筆下的聞一多先生是一位潛心于學(xué)術(shù)研究,“做了再說,做了不說”的學(xué)者;也是一位英勇無畏,“說了就做,言論與行動完全一致”的革命家。中國自古以來就重視言行一致,并把它當(dāng)成做人的準(zhǔn)則之一。請收集關(guān)于言和行的成語或名言,選取一句作為你的座右銘,并說明理由。2.課外閱讀聞一多的《太陽吟》《死水》《靜夜》等詩作,欣賞其藝術(shù)特色,感受其中的精神追求。

  • 人教版新目標(biāo)初中英語七年級下冊How was your weekend教案2篇

    人教版新目標(biāo)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(xué)步驟、時間 教師活動 學(xué)生活動 媒體應(yīng)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(xué)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(xué)習(xí))

  • 人教版新目標(biāo)初中英語七年級下冊Don’t eat in class教案2篇

    人教版新目標(biāo)初中英語七年級下冊Don’t eat in class教案2篇

    Don’t fight. =You can’t fight. (板書,教讀)教師把這些句子板書在黑板上,并請學(xué)生大聲整齊地讀祈使句和“can’t”句型,并讓學(xué)生注意兩種句型表達形式的不同和轉(zhuǎn)換,“Don’t …=You can’t…”;并對學(xué)生說:These are our school rules. (板書,教讀) You can’t break the school rules. Don’t break the school rules.(板書,教讀)步驟3 :Practicea. T: Now, each of the students is breaking one of these rules.Please finish 1a.學(xué)生看圖,完成1a的內(nèi)容,檢查答案并大聲朗讀校規(guī)。b. 聽錄音,完成1b,選出四位學(xué)生都違反了哪條校規(guī);聽之前,學(xué)生要讀會英文名。c. 請兩位學(xué)生朗讀1c部分的句型;要求學(xué)生兩人一組對話表演,SA扮演外校轉(zhuǎn)來新生,SB告知本校校規(guī)。(學(xué)生可經(jīng)過討論,多說出他們想到的校規(guī),不必只限于書上;教師應(yīng)給予幫助)2) 第二課時(2a~4)步驟1 :warming up of revisionT: What are the rules at your school?學(xué)生使用“can”或祈使句表達各條校規(guī);其中老師可引出“eat in the cafeteria outside”的表達。步驟2 :Practicea.T: Christina is an exchange student. She doesn’t know the rules. Let’s listen, what activities they’re talking about?學(xué)生聽第一遍時,完成2a;第二遍時,完成2b;b. 請學(xué)生領(lǐng)讀2c部分,看著2a完成的表格,理解2c活動的要求;分成小組針對2a進行問答;

  • 人教版新目標(biāo)初中英語七年級下冊Where is your pen pal from教案

    人教版新目標(biāo)初中英語七年級下冊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:通過本單元的學(xué)習(xí),學(xué)生基本可以談?wù)撊藗兊膰?,居住城市及其所說的語言,通過書信方式去介紹自己并尋找筆友。但在涉及到國外的一些城市時,學(xué)生對這方面的知識相對欠缺,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)生無法通過網(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)生通過計算機網(wǎng)絡(luò)獲取信息,拓寬知識面。

  • 人教版新目標(biāo)初中英語七年級下冊What do you think of game shows教案

    人教版新目標(biāo)初中英語七年級下冊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.說明:這一步旨在讓學(xué)生運用已有的語言知識談?wù)搶κ挛锏目捶ê鸵庖?,并簡單闡明理由,培養(yǎng)學(xué)生的主動思維能力和運用英語的能力。六、教學(xué)拓展調(diào)查電視節(jié)目的收視率任務(wù):調(diào)查你周圍的人對現(xiàn)在各種電視節(jié)目的反響?;顒舆^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)生進行調(diào)查活動,運用本單元所學(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)初中英語七年級下冊Where did you go on vacation教案

    人教版新目標(biāo)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(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單表達。談?wù)摷倨谧龅氖虑榧爱?dāng)時情況。談?wù)摷倨跁r旅游的天氣,旅游者以及食物等。教學(xué)過程一、導(dǎo)入播放一首英文歌曲:Let’s travel 說明:通過讓學(xué)生聽節(jié)奏歡快迪斯尼英語歌曲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,增強課堂氣氛,激發(fā)學(xué)生提高學(xué)習(xí)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(yīng)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(xué)生對詞匯的印象。

  • 人教版新目標(biāo)初中英語七年級下冊What does he look like教案3篇

    人教版新目標(biāo)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(shè)計理想中的人類Step one: 設(shè)計理想中的人類的外貌。把全班同學(xué)分成若干小組,學(xué)生可以邊說邊在紙上畫出他們的模樣。Step two: 設(shè)計理想中人類的性格。學(xué)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(xué),其他同組同學(xué)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(xué)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(biāo)初中英語七年級下冊Where is the post office教案2篇

    人教版新目標(biāo)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(biāo)初中英語七年級下冊I ’d like some noodles教案

    人教版新目標(biāo)初中英語七年級下冊I ’d like some noodles教案

    教學(xué)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”

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    人教版新目標(biāo)初中英語七年級下冊I want to be an actor教案2篇

    三、教學(xué)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(biāo)初中英語七年級下冊It’s raining教案2篇

    人教版新目標(biāo)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(xué)反思:新課程標(biāo)準(zhǔn)中強調(diào)學(xué)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(xué)生不同層次的任務(wù),讓各層面的學(xué)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(xué),效果更好。同時讓了解其他國家風(fēng)景,風(fēng)俗的同學(xué)介紹ideal place,增加學(xué)生的背景知知識,實現(xiàn)跨學(xué)科交流的目的。教案點評:采用任務(wù)型教學(xué)模式,在各個活動中給不同程度的學(xué)生不同層次的任務(wù),讓各層面的學(xué)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(xué),效果更好。讓了解其他國家風(fēng)景,風(fēng)俗的同學(xué)介紹ideal place,增加學(xué)生的背景知識,實現(xiàn)跨學(xué)科交流的目的。

  • 人教版新目標(biāo)初中英語七年級下冊Why do you like koalas教案2篇

    人教版新目標(biāo)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(xué)重點。通過本單元的學(xué)習(xí),學(xué)生應(yīng)能較流利地運用所學(xué)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(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)重難點一覽(五)單元學(xué)情分析學(xué)生此前已經(jīng)學(xué)過由why, where, what 引導(dǎo)的特殊疑問句句型,具有了學(xué)習(xí)本單元知識的認知前提。形形色色的動物能激發(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的教學(xué)和學(xué)生學(xué)習(xí)興趣的培養(yǎng)。

  • 部編版語文八年級下冊《口語交際:應(yīng)對》教案

    部編版語文八年級下冊《口語交際:應(yīng)對》教案

    【研討練習(xí)】題一:閱讀下邊的應(yīng)對案例,簡要說明這些名人采用了什么應(yīng)對技巧。1.孔融十歲的時候就表現(xiàn)出超乎尋常的聰明才智,得到人們的贊許。有一個叫陳的官員卻當(dāng)眾不以為然地說:“小時了了(聰明),大未必佳?!笨兹诹⒓椿貞?yīng)道:“想君小時,必當(dāng)了了?!?.一名英國女士非常喜歡錢鐘書的小說《圍城》,于是打電話給錢鐘書請求見面。錢鐘書對她說:“假如你吃了個雞蛋覺得不錯,何必認識那下蛋的母雞呢?”3.一個年輕的畫家拜訪德國著名的畫家阿道夫·門采爾,向他訴苦說:“我真不明白,為什么我畫一幅畫只用一會兒工夫,可賣出去要整整一年?!薄罢埖惯^來試試吧,”門采爾認真地說,“要是你花一年的工夫去畫它,那么只用一天就準(zhǔn)能賣掉它?!盻_______________________________________________________________________________________________________________________________________參考答案:1.針鋒相對2.歸謬3.自嘲題二:在我們的生活當(dāng)中,經(jīng)常會碰到別人有意的嘲諷。閱讀下面的情境,機智應(yīng)對。

  • 北師大初中數(shù)學(xué)九年級上冊用配方法求解簡單的一元二次方程2教案

    北師大初中數(shù)學(xué)九年級上冊用配方法求解簡單的一元二次方程2教案

    (1) 你能解哪些特殊的一元二次方程?(2) 你會解下列一元二次方程嗎?你是怎么做的?x2=5,2x2+3=5,x2+2x+1=5 ,(x+6)2 +72 = 102(3) 你能解方程x2+12x-15=0嗎?你遇到的困難是什么?你能設(shè)法將這個方程轉(zhuǎn)化成上面方程的形式嗎?與同伴進行交流?;顒佣鹤鲆蛔觯禾钌线m當(dāng)?shù)臄?shù),使下列等式成立(1)x2+12x+ =(x+6)2 (2)x2―4x+ =(x― )2 (3)x2+8x+ =(x+ )2 在上面等式的左邊,常數(shù)項和一次項有什么關(guān)系解一元二次方程的思路是什么?活動三:例1、解方程:x2+8x-9=0你能用語言總結(jié)配方法嗎?課本37頁隨堂練習(xí)課時作業(yè):

  • 北師大初中數(shù)學(xué)九年級上冊用配方法求解簡單的一元二次方程2教案

    北師大初中數(shù)學(xué)九年級上冊用配方法求解簡單的一元二次方程2教案

    二、合作交流活動一:(1) 你能解哪些特殊的一元二次方程?(2) 你會解下列一元二次方程嗎?你是怎么做的?x2=5,2x2+3=5,x2+2x+1=5 ,(x+6)2 +72 = 102(3) 你能解方程x2+12x-15=0嗎?你遇到的困難是什么?你能設(shè)法將這個方程轉(zhuǎn)化成上面方程的形式嗎?與同伴進行交流?;顒佣鹤鲆蛔觯禾钌线m當(dāng)?shù)臄?shù),使下列等式成立(1)x2+12x+ =(x+6)2 (2)x2―4x+ =(x― )2 (3)x2+8x+ =(x+ )2 在上面等式的左邊,常數(shù)項和一次項有什么關(guān)系解一元二次方程的思路是什么?活動三:例1、解方程:x2+8x-9=0你能用語言總結(jié)配方法嗎?課本37頁隨堂練習(xí)課時作業(yè):

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