-
人教版新目標(biāo)初中英語七年級上冊What time do you go to school教案
知識與能力復(fù)習(xí)詞匯time，morning，breakfast，get up，g0 t0 bed，homework，clock，afternoon，lunch，run，watch TV，evening，dinner，eat，usually，o’clock，thirty，fifteen，take a shower，go t0 school等；引導(dǎo)學(xué)生復(fù)習(xí)、鞏固“詢問和談?wù)摃r間”的目標(biāo)語言并運用所學(xué)知識安排自己的學(xué)習(xí)和課外活動。過程與方法運用Summarizing，Classifying和Comparing的學(xué)習(xí)策略。在復(fù)習(xí)教學(xué)中，運用聽寫、提問、對話演練與調(diào)查活動，促使學(xué)生不斷地使用所學(xué)內(nèi)容，從而提高他們靈活運用知識的能力。情感態(tài)度價值觀本部分的主要內(nèi)容是復(fù)習(xí)“日常作息時間”的詢問和表達。通過互相詢問或談?wù)撟约夯驅(qū)Ψ降淖飨r間安排和活動計劃，培養(yǎng)學(xué)生良好的作息習(xí)慣和守時習(xí)慣。教學(xué)重、難點及教學(xué)突破重點復(fù)習(xí)詞匯time，morning，breakfast，get up，g0 to bed，homework，clock，afternoon，lunch，run，watch TV，evening，dinner，eat，usually，o’clock，thirty，fifteen，take a shower，go to school等；引導(dǎo)學(xué)生復(fù)習(xí)、鞏固“詢問和談?wù)摃r間”的目標(biāo)語言。
人教版新目標(biāo)初中英語七年級上冊What’s this in English教案
一、知識和能力目標(biāo)本單元的核心教學(xué)內(nèi)容是“認(rèn)物”。用英語確認(rèn)周圍的常見事物比較符合英語初學(xué)者的實際情況。通過本單元教學(xué)，使學(xué)生運用所學(xué)句型，去熟悉周圍事物的名稱；教學(xué)生學(xué)會在實際生活中如何確認(rèn)事物。通過辨認(rèn)物體，學(xué)生學(xué)到一些生詞，并鞏固所學(xué)句型。二、過程和方法目標(biāo)教師要盡量使學(xué)生對課文中出現(xiàn)的句型能夠熟練上口，這樣，學(xué)生才能順利開展比較靈活的對話。教師可以用手勢，表情，動作等示意，幫助學(xué)生聽懂課堂教學(xué)內(nèi)容，但在實際操作中應(yīng)盡量避免“明知故問”的傾向，應(yīng)該采用應(yīng)用性原則；如：遮蓋物品、顯露局部、辨認(rèn)物體、完形識別、圖形辨認(rèn)等方法。三、情感態(tài)度和價值觀目標(biāo)目標(biāo)在學(xué)生學(xué)習(xí)過程中的作用至關(guān)重要，教師要幫助他們建立起一個切合自己實際的目標(biāo)，通過漸進的學(xué)習(xí)以及一點一滴的進步，使他們逐步建立起成功感。成功越多，自信心就越強。
人教版新目標(biāo)初中英語八年級上冊How do you make a banana milk shake教案2篇
1. First, ... then, ... next, ... finally, ...首先，……然后，……接著，……最后，……這是英語中表達做某事的步驟的一種說法。如果步驟較多，還可以說：first-next-after that-later on-finally/at last通常你會聽到說英語國家的人在說 first, next, then, finally 和后面的內(nèi)容時，他們會做一些停頓。這樣就能提前告訴聽者接下來講的是一系列的步驟。這一點在朗讀和聽力中應(yīng)特別注意。2. how many, how much均為疑問詞，同是“多少”，但用法不同。請看：how many修飾可數(shù)名詞復(fù)數(shù)，how much修飾不可數(shù)名詞。但在用法上，同學(xué)們常犯如下錯誤：1) [誤] How many are there bananas on the table?[正] How many bananas are there on the table?[析] how many, how much 中的many，much是形容詞，常修飾名詞作定語，故后面跟名詞。2) [誤]How much tea are there on the table?[正]How much tea is there on the table?[析] how much修飾不可數(shù)名詞時，謂語動詞用單數(shù)。how many與how much的區(qū)別可簡記為：前how many：問“多少”，復(fù)數(shù)名詞后面跑；how much問“多少”，不可數(shù)名詞單數(shù)好。前者答語用基數(shù)詞，后者答語用數(shù)量關(guān)系。
人教版新目標(biāo)初中英語八年級上冊How was your school trip教案2篇
“Go for it!” is based on “Task-Based Language Teaching”. It adheres to “The authenticity principle”, “The form-function principle”, “The task dependency principle” and “The principle of learning by doing”. These principles all accord with the demands of curriculum focus.In and of Grade Seven (II), “Go for it!”, students have learned “The Simple Past Tense”. And it appears again in of Grade Eight (I). teaches students more about how to talk about events in the past. In addition, it gives affirmative and negative statements in the past tense, such as the sentence patterns “Did you see …?” “Were there …?” “Did you go …?” As the first part of Unit 8, Section A opens with a picture presenting the last school trip in the aquarium and continues with several step-by-step practice activities, which are all good for students to master “The Simple Past Tense”. Doing well in Section A will help students integrate the new target language with that in Section B. Thus, they can describe the events in the past freely and foster their own ability of reflecting and practicing. II. Teaching ObjectivesTeaching objective is the beginning and aim of teaching activities. According to the overall goal of the English elementary course--- improve students' synthetic ability of language application, which should be based on the development of students’ “Language knowledge”, “Language skills”, “Character building”, “Learning strategies” and “Cross-cultural awareness”. The teaching objectives are described as follows(I). Knowledge objectivesi. Master the simple past tense of regular and irregular verbsii. Recite the new words and expressions about the last school trip in the aquarium, including their pronunciation and intonation
人教版新目標(biāo)初中英語八年級上冊How do you get to school教案2篇
Step Ⅶ Role play ( Work on 1b)1. First ask two students to read the dialogue to the class.Sa: How do you get to school?Sb: Well, I ride my bike to the subway station. Then I take the subway.2. Now work with a partner.Suppose you use two kinds of transportation to get to school \Hangzhou\Beijing... (bus, train, subway, walking, bike, etc.) Tell how you get there. You may use the phrases in 1a.3. Then ask different pairs of students to present their conversations to the class.Step ⅧListening1. Work on 2a(1) First ask students to read the list of information that Thomas wants to know.…where Nina lives.…h(huán)ow far from school she lives.…h(huán)ow long it takes to get to school.…h(huán)ow she gets to school.…what she thinks of the transportation.(2) Tell students what transportation and bus stop mean.bus stop 汽車站 transportation n. 運送；運輸Then tell students we'll hear a recording. Please put a checkmark in front of each thing that Thomas wants to know.(3) Now play the recording for students.( Have students pay attention to the sample answer.) (4) Then correct the answers.
人教版新目標(biāo)初中英語八年級上冊What are you doing for vacation教案2篇
Teaching goals : 1. Words & phrases: babysit ,get back , fishing , rent , think about , decide(on) , tourist etc. 2. How to talk about future plans . 3. 現(xiàn)在進行時表示將來計劃或行動. 4. 特殊疑問句（where , when , how long引導(dǎo)） Important and difficult points : Drills :What are you doing for vacation ? I’m watching TV . When are you going ? I’m going … . How long are you staying ? We’re staying for five days . Teaching aids : cards and a tape ,a large wall calendar . Period 1 Teaching procedures : Step 1Leading in1. Free talk . 2. Put up the wall calendar . T: I’m staying home on Saturday (pointing to next Saturday ).Ss repeat . Ss: I’m staying home on Saturday . T: OK. Today we’ll learn how to talk about future plans. Step 2Pre-task SB Page 13 , 1a . 1. Look at the picture carefully and tell what you see in the picture . 2. Write the activities from the pictures in the box and add some more . 3. Practice reading . Step 3While-task1. Using the activities we write in 1a to make conversations .For example :What are you doing for vacation ? I’m visiting my uncle . 2. Pairwork .Practice in pairs . 3. 用第三人稱練習(xí)對話.
人教版新目標(biāo)初中英語八年級上冊I’m more outgoing than my sister教案2篇
1 交通工具的比較此活動為小組活動。學(xué)生通過討論找出到達某一城市可乘坐的各種交通工具，并選擇最佳出行方式。Teacher:We’re going to Shanghai. How many ways can we use to get there? Yes, there are four ways: by bus, by plane, by train, by ship. Please discuss how you are going to get there.操作建議：（1）學(xué)生以小組為單位展開活動，談?wù)摫窘M所選擇的交通工具。（2）各組選代表向全班匯報，闡述本組所選擇的交通工具的利和弊。完成任務(wù)所需要的語言結(jié)構(gòu)：We can go there by ship. It’s more comfortable and cheaper than any other transportation.We can go there by bus. It’s cheaper but it takes longer time.2 哪個城市更合適？此活動具有挑戰(zhàn)性。假設(shè)中國要舉行2014年世界杯足球賽，分別從歷史，人文，天氣等方面對各城市（北京，大連，上海，昆明）進行比較，選擇最佳舉辦城市。T: Imagine China is holding the 2014 FIFA World Cup. Which city do you think is the best for the World Cup, Beijing, Dalian, Shanghai or Kunming? Let’s work in groups. If you choose Beijing, please join the Team Red. If you chose Dalian, please join the Team White. If you choose Shanghai, please join the Team Blue. If you choose Kunming, please join the Team Green. Please show us its advantages. Then let’s see which team will win.
人教版新目標(biāo)初中英語八年級上冊What’s the best radio station教案2篇
教學(xué)重點和難點：運用所掌握的語言描述，比較不同地點的特點。在練習(xí)中學(xué)習(xí)掌握英語比較級和最高級的用法。課前準(zhǔn)備分配小組,每組五至六人。通過上網(wǎng)或翻閱報刊雜志等方法，確定旅游線路，做出基本的旅游計劃。教學(xué)設(shè)計：本節(jié)課流程圖 學(xué)法指導(dǎo)：1．由于這是一堂新課，在教學(xué)中應(yīng)注意面向全體，發(fā)揮學(xué)生的主體性，引導(dǎo)學(xué)生積極參與，激發(fā)學(xué)生的求知欲和學(xué)習(xí)積極性，指導(dǎo)學(xué)生積極思維，主動獲取知識，養(yǎng)成良好的學(xué)習(xí)方法。逐步學(xué)會獨立解決問題?？傊M可能調(diào)動學(xué)生的非智力因素促進智力因素的發(fā)展。教法選擇：1．電化教學(xué)法2．課堂討論法3．任務(wù)型教學(xué)法采用這些方法的目的是為了充分調(diào)動學(xué)生的學(xué)習(xí)積極性，使學(xué)生變被動學(xué)習(xí)為主動學(xué)習(xí)。通過電腦形象的演示，加強印象，提高興趣，突破難點，提高教學(xué)效率，進而增大教學(xué)的容量和信息量。充分體現(xiàn)教師為主導(dǎo)，學(xué)生為主體的教學(xué)原則。
人教版新目標(biāo)初中英語八年級上冊What’s the matter教案2篇
She shouldn’t go to the party tonight.Step7. TaskT: You know, there are lots of problems in our life. If you are a doctor, please tell us how to solve the problem. I will divide you into 9 groups. Please work in groups. And then choose one of you to report your ideas.The following are the problems:I have a toothache.I am hungry. I have a sore throat.I am stressed out. I have a sore back.I am tired. I can’t sleep.I have a cold. I have a headache.Report: If you have a headache, you should go to bed early. You should see the doctor. You should eat some medicine. You shouldn’t wash your face with cold water.You shouldn’t sleep late.You shouldn’t swim.…..T encourages the students to give advice as much as possible.Homework:1. Chose one of the problems, and write down your advice2. Copy the new words這一步是用于熱身的,同時也可以讓他們復(fù)習(xí)一部分的表示人體部位的單詞,擴充知識.學(xué)習(xí)語言的過程也是一個不斷積累的過程,復(fù)習(xí)舊知識,增添新知識.通過小游戲,強化學(xué)生對Does she/he have…這個句子的運用能力.通過復(fù)習(xí)，自然的引到下面新知識的學(xué)習(xí)。充分利用表格,由句子到對話,再到文章,讓學(xué)生循序漸進. 提高學(xué)生的綜合語言運用能力,運用以前學(xué)過的知識來解決身邊的問題.Period 5 (Section B 3a—3c, selfcheck)教學(xué)內(nèi)容與分析:
人教版新目標(biāo)初中英語九年級上冊Teenagers should be allowed to choose their own clothes教案2篇
Step 1 Greeting Greet the class and check the homeworkStep 2 A duty report The S on duty gives a report on the rules in his home and lead in 3a “Sun Fei’s and Wu Yu’s rules” Step 3 ReadingSs read the conversation and write the two girls’ rules in the chart. Check the answers.Get Ss to read after the tape and then read aloud by themselves. Then, T explains the language points.Step 4 Pairwork 3bRole play. Use the information in chart to practice with the conversation in 3a covered. They can look at the sample conversation in the right box.Step 5 Task 2 “Who’s the best reporter?”Make a survey by asking any 5 students the questions in the chart in activity 4. Then give out a report about it. See who is the best reporter? And the best reporter will get a nice ball-pen.Step 6 Summary and homework:Write out the report in your exercise-books.Period ThreeStep 1 Greeting and a duty reportThe S gives a duty report talking about his experience of being late for school. Lead in the question “Do you ever get to school late? How often do you get to school late? Always, usually, sometimes, or never?Step 2 1a Get Ss to finish writing.Step 3 Pairwork 1b Get Ss to talk about their answers with their partners using the sample conversation in the box on the right.Step 4 Listening practice2a Lead-in: What will happen if you get to school late? What about Peter? Let’s listen to a conversation between Peter and his father. Get Ss to finish 2a (As usual, for the first time, Ss only listen.) Check the answers.
人教版新目標(biāo)初中英語九年級上冊I like music that I can dance to教案
教學(xué)目標(biāo): 1. Express preferences2. Talk about one’s likes and dislikes and the reasons3. Learn to express one’s opinions 4. Learn to write a reply 語言功能： 1) Talk about one’s preferences, using t he relative clause2) Talk about people’s likes and dislikes and the reasons3) Talk about opinions語言結(jié)構(gòu)： Relative clauses with that and who語言目標(biāo)：What kind of music do you like?I like music that I can sing along with.I love singers who write their own music.We prefer music that has great lyric.重點詞匯及短語：heart, photography, interest, class, whatever, miss, okay, expect, sweet, taste, itself, laboratory, cancer, increase, biscuit, main, care， prefer… to…, remind somebody of …, dance to, sing along with, be sure to, interest somebody, make somebody adj., to be honest, suit somebody, on display, catch up教學(xué)重難點：What do other people think of the different kinds of things? How to express one’s opinions? 學(xué)習(xí)方式：討論，合作學(xué)習(xí)情感目標(biāo)：通過本單元的學(xué)習(xí)，能提高學(xué)生的藝術(shù)鑒賞能力和審美情趣，并引導(dǎo)學(xué)生養(yǎng)成健康的飲食習(xí)慣。課時安排5課時第一課時：Section A: 1a-2c第二課時：Section A : 3a-4第三課時：Section B:1-2c, Self check2第四課時：Section B: 3a-4, Self check1第五課時：Self check ReadingI like music that I can dance to.
人教版新目標(biāo)初中英語九年級上冊I used to be afraid of the dark教案
內(nèi)容提示1．本單元主要內(nèi)容是學(xué)會used to結(jié)構(gòu)。Used to +動詞原形表示過去經(jīng)常、以前常常，只用于過去式中，用來表示現(xiàn)在已不存在的習(xí)慣或狀態(tài)。例如：They used to play football together．他們過去常在一起蹋足球。（現(xiàn)在不在一起踢了)2．used to的疑問形式和否定形式為Did you use to…?和I didn’t use to… 也可以用Used you to…?和I used not to…但現(xiàn)在多使用前者。例如：Did you used to swim in the river? 你過去常在河里游泳嗎?I didn’t use to play the piano． 我以前并不經(jīng)常彈鋼琴。教學(xué)目標(biāo)一、學(xué)習(xí)目標(biāo)（Language Goal） 1．學(xué)會陳述自己過去常做的事情。2．學(xué)會陳述自己過去的愛好等。3．能夠表達自己現(xiàn)在和過去在外表、性格、娛樂等方面的變化。4．能夠表達朋友、家人等現(xiàn)在和過去的變化。二、語言結(jié)構(gòu)（Language Structures） 1．I used to be short when I was young. 我年輕時個子很矮。 2． —Did you use to have straight hair? 你過去是直發(fā)嗎？—Yes, I did. 是的。 3． —Did you use to play the piano? 你過去彈鋼琴嗎？—No, I didn’t. 不，我不彈。 4．I used to be afraid of dark. 我過去害怕黑暗。 5．I’m terrified of the snakes. 我害怕蛇。
人教版新目標(biāo)初中英語九年級上冊How do you study for a test教案2篇
內(nèi)容提示本單元主要內(nèi)容是學(xué)會利用verb十by／with gerund表示方式方法來討論學(xué)習(xí)英語的策略，認(rèn)識自己在學(xué)習(xí)方面的長處和不足。初步了解現(xiàn)在完成時的結(jié)構(gòu)和用法?，F(xiàn)在完成時由助動詞have／has+動詞的過去分詞構(gòu)成，主要表示過去發(fā)生的某一動作對現(xiàn)在仍有影響或造成的后果，常與already，yet，just，ever，never等副詞連用。教學(xué)目標(biāo)一、學(xué)習(xí)目標(biāo)（Language Goal） 1. Talk about how to study . 學(xué)會討論各種學(xué)習(xí)方法和策略。2. Find out your suitable learning methods. 找出適合自己的學(xué)習(xí)方法。 二、語言結(jié)構(gòu)（Language Structures） 1. Verb + by with gerund by＋動名詞短語 表示“通過…途徑，方法” 2. How questions have引導(dǎo)的特殊疑問句 三、目標(biāo)語言（Target Language） 1. How do you study for tests ? 你是怎樣準(zhǔn)備考試的？Well , I study by working with my classmates. 哦，我和同學(xué)們一起學(xué)習(xí)。2. Have you ever studied with a group ? 你曾經(jīng)參加過學(xué)習(xí)小組嗎？Yes , I have . I’ve learned a lot that way . 是的，參加過。通過這種方式我學(xué)了許多。
人教版新目標(biāo)初中英語九年級上冊It must belong to Carla教案
一、Section A該部分有4個模塊。第一模塊圍繞Whose volleyball is this? 這一話題展開思維（ 1a）、聽力（1b）、口語（ 1c）訓(xùn)練；第二模塊圍繞上一模塊中的話題進行聽力（ 2a-2b）、口語訓(xùn)練（ 2c）；第三模塊繼續(xù)圍繞前兩個模塊中的“making inferences”展開訓(xùn)練。訓(xùn)練形式為閱讀排序（ 3a）和兩人問答（3b）；第四模塊仍就上一話題展開討論。二、Section B該部分有4個模塊。第一模塊要求根據(jù)圖畫和所提供的單詞寫出合理的句子；第二模塊在聽力（ 2a-2b）和分角色口語訓(xùn)練（ 2c）的基礎(chǔ)上，繼續(xù)進行“推測”訓(xùn)練; 第三模塊圍繞“Strange events in Bell Tower neighborhood”這一話題展開閱讀（ 3a）和寫作（3b -3c）訓(xùn)練；第四模塊以dream為話題展開小組活動。三、Self Check該部分有3個模塊。第一模塊以填空形式對所學(xué)詞匯進行訓(xùn)練；第二模塊就8個諺語展開閱讀和討論。
人教版新目標(biāo)初中英語九年級上冊Where would you like to visit教案2篇
The First PeriodⅠ．Teaching Aims and DemandsKnowledge Objects（1） Key Vocabularytiring, educational, fascinating, thrilling, peaceful, exotic, trek, jungle, take it easy, explore, historic, site（2） Target LanguageWhere would you like to go on vacation?I’d like to trek through the jungle, because I like exciting vacations．2． Ability Objects（1）Train students to talk about places they would like to visit with the target language．（2）Train students to describe vacations with different adjectives．（3）Train students' listening skill．3． Moral Object,It′s more interesting to go on vacating somewhere instead of staying at home．Ⅱ． Teaching Key Points1． Key Vocabularytiring, educational, fascinating, thrilling, peaceful, exotic, trek, jungle, take it easy, explore, historic, site2． Target LanguageTalk about different places with the target language．Ⅲ． Teaching Difficult Points1． Describe vacations with different adjectives．2． Talk about different places with the target language．Ⅳ． Teaching Methods1． Teaching by illumination2． Teaching by doing chain drills3． Teaching by pairworkⅤ． Teaching Aids1． A tape recorder2． Some pictures of different places with famous views
北師大初中七年級數(shù)學(xué)上冊普查和抽樣調(diào)查教案1
判斷下面抽樣調(diào)查選取樣本的方法是否合適：（1）檢查某啤酒廠即將出廠的啤酒質(zhì)量情況，先隨機抽取若干箱（捆），再在抽取的每箱（捆）中，隨機抽取1～2瓶檢查；（2）通過網(wǎng)上問卷調(diào)查方式，了解百姓對央視春節(jié)晚會的評價；（3）調(diào)查某市中小學(xué)生學(xué)習(xí)負(fù)擔(dān)的狀況，在該市每所小學(xué)的每個班級選取一名學(xué)生，進行問卷調(diào)查；（4）教育部為了調(diào)查中小學(xué)亂收費情況，調(diào)查了某市所有中小學(xué)生.解析：本題應(yīng)看樣本是否為簡單隨機樣本，是否具有代表性.解：（1）合適，這是一種隨機抽樣的方法，樣本為簡單隨機樣本.（2）不合適，我國農(nóng)村人口眾多，多數(shù)農(nóng)民是不上網(wǎng)的，所以調(diào)查的對象在總體中不具有代表性.（3）不合適，選取的樣本中個體太少.（4）不合適，樣本雖然足夠大，但遺漏了其他城市里的這些群體，應(yīng)在全國范圍內(nèi)分層選取樣本，除了上述原因外，每班的學(xué)生全部作為樣本是沒有必要的.
北師大初中七年級數(shù)學(xué)上冊利用去括號解一元一次方程教案1
解：設(shè)每張300元的門票買了x張，則每張400元的門票買了（8－x）張，由題意得300x＋400×（8－x）＝2700，解得x＝5，∴買400元每張的門票張數(shù)為8－5＝3（張）.答：每張300元的門票買了5張，每張400元的門票買了3張.方法總結(jié)：解題的關(guān)鍵是熟練掌握列方程解應(yīng)用題的一般步驟：①根據(jù)題意找出等量關(guān)系；②列出方程；③解方程；④作答.三、板書設(shè)計本節(jié)課的教學(xué)先讓學(xué)生回顧上一節(jié)所學(xué)的知識，復(fù)習(xí)鞏固方程的解法，讓學(xué)生進一步明白解方程的步驟是逐漸發(fā)展的，后面的步驟是在前面步驟的基礎(chǔ)上發(fā)展而成的.然后通過一個實際問題，列出一個有括號的方程，大膽放手讓學(xué)生去探索、猜想各種解法，去嘗試各種解題的途徑，啟發(fā)學(xué)生在化歸思想影響下想到要去括號.
北師大初中數(shù)學(xué)八年級上冊二次根式及其化簡2教案
屬于此類問題一般有以下三種情況①具體數(shù)字，此時化簡的條件已暗中給定，②恒為非負(fù)值或根據(jù)題中的隱含條件，如（1）小題。③給出明確的條件，如（2）小題。第二類，需討論后再化簡。當(dāng)題目中給定的條件不能判定絕對值符號內(nèi)代數(shù)式值的符號時，則需討論后化簡，如（4）小題。例3．已知a+b=-6,ab=5，求 的值。解：∵ab=5>0,∴a,b同號，又∵a+b=-6<0,∴a<0,b<0∴ .說明：此題中的隱含條件a<0,b<0不能忽視。否則會出現(xiàn)錯誤。例4．化簡： 解：原式=|x-6|-|1+2x|+|x+5|令x-6=0，得x=6，令1+2x=0，得 ，令x+5=0，得x=-5.這樣x=6, ,x=-5，把數(shù)軸分成四段（四個區(qū)間）在這五段里分別討論如下：當(dāng)x≥6時，原式=(x-6)-(1+2x)+(x+5)=-2.當(dāng) 時，原式=-(x-6)-(1+2x)+(x+5)=-2x+10.當(dāng) 時，原式=-(x-6)-[-(1+2x)]+(x+5)=2x+12.當(dāng)x<-5時，原式=-(x-6)+(1+2x)-(x+5)=2.說明：利用公式 ，如果絕對值符號里面的代數(shù)式的值的符號無法決定，則需要討論。方法是：令每一個絕對值內(nèi)的代數(shù)式為零，求出對應(yīng)的“零點”，再用這些“零點”把數(shù)軸分成若干個區(qū)間，再在每個區(qū)間內(nèi)進行化簡。
北師大初中數(shù)學(xué)八年級上冊驗證勾股定理1教案
探究點二：勾股定理的簡單運用如圖，高速公路的同側(cè)有A，B兩個村莊，它們到高速公路所在直線MN的距離分別為AA1＝2km，BB1＝4km，A1B1＝8km.現(xiàn)要在高速公路上A1、B1之間設(shè)一個出口P，使A，B兩個村莊到P的距離之和最短，求這個最短距離和．解析：運用“兩點之間線段最短”先確定出P點在A1B1上的位置，再利用勾股定理求出AP＋BP的長．解：作點B關(guān)于MN的對稱點B′，連接AB′，交A1B1于P點，連BP.則AP＋BP＝AP＋PB′＝AB′，易知P點即為到點A，B距離之和最短的點．過點A作AE⊥BB′于點E，則AE＝A1B1＝8km，B′E＝AA1＋BB1＝2＋4＝6(km)．由勾股定理，得B′A2＝AE2＋B′E2＝82＋62，∴AB′＝10(km)．即AP＋BP＝AB′＝10km，故出口P到A，B兩村莊的最短距離和是10km.方法總結(jié)：解這類題的關(guān)鍵在于運用幾何知識正確找到符合條件的P點的位置，會構(gòu)造Rt△AB′E.三、板書設(shè)計勾股定理驗證拼圖法面積法簡單應(yīng)用通過拼圖驗證勾股定理并體會其中數(shù)形結(jié)合的思想；應(yīng)用勾股定理解決一些實際問題，學(xué)會勾股定理的應(yīng)用并逐步培養(yǎng)學(xué)生應(yīng)用數(shù)學(xué)解決實際問題的能力，為后面的學(xué)習(xí)打下基礎(chǔ)．
北師大初中數(shù)學(xué)八年級上冊軸對稱與坐標(biāo)變化2教案
8.一束光線從點Ａ（３，３）出發(fā)，經(jīng)過ｙ軸上點Ｃ反射后經(jīng)過點Ｂ（１，0）則光線從Ａ點到Ｂ點經(jīng)過的路線長是（ ）A．4 B．5 C．6 D．7第四環(huán)節(jié)課堂小結(jié)1、關(guān)于y軸對稱的兩個圖形上點的坐標(biāo)特征：(x , y)——(- x , y)2、關(guān)于x軸對稱的兩個圖形上點的坐標(biāo)特征：(x , y)——(x , - y)3、關(guān)于原點對稱的兩個圖形上點的坐標(biāo)特征：(x , y)——(- x , -y)第五環(huán)節(jié)布置作業(yè)習(xí)題3.5 1，2，3四、 教學(xué)反思通過“坐標(biāo)與軸對稱”，經(jīng)歷圖形坐標(biāo)變化與圖形的軸對稱之間的關(guān)系的探索過程， 掌握空間與圖形的基礎(chǔ)知識和基本技能，豐富對現(xiàn)實空間及圖形的認(rèn)識，建立初步的空間觀念，發(fā)展形象思維，激發(fā)學(xué)生對數(shù)學(xué)學(xué)習(xí)的好奇心與求知欲，學(xué)生能積極參與數(shù)學(xué)學(xué)習(xí)活動；積極交流合作，體驗數(shù)學(xué)活動充滿著探索與創(chuàng)造。教學(xué)中務(wù)必給學(xué)生創(chuàng)造自主學(xué)習(xí)與合作交流的機會，留給學(xué)生充足的動手機會和思考空間，教師不要急于下結(jié)論。事先一定要準(zhǔn)備好坐標(biāo)紙等，提高課堂效率。