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北师大初中七年级数学下册利用“角边角”“角角边”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——“角边角”“角角边”；(重点)2．能运用“角边角”“角角边”判定方法解决有关问题．(难点) 一、情境导入如图所示，某同学把一块三角形的玻璃不小心打碎成了三块，现在要到玻璃店去配一块完全一样的玻璃，那么最省事的办法是带哪块去？学生活动：学生先自主探究出答案，然后再与同学进行交流．教师点拨：显然仅仅带①或②是无法配成完全一样的玻璃的，而仅仅带③则可以，为什么呢？本节课我们继续研究三角形全等的判定方法．二、合作探究探究点一：全等三角形判定定理“ASA”如图，AD∥BC，BE∥DF，AE＝CF，试说明：△ADF≌△CBE.解析：根据平行线的性质可得∠A＝∠C，∠DFE＝∠BEC，再根据等式的性质可得AF＝CE，然后利用“ASA”可得到△ADF≌△CBE.
北师大初中七年级数学下册三角形的内角和教案
解：∵CE⊥AF，∴∠DEF＝90°，∴∠EDF＝90°－∠F＝90°－40°＝50°.由三角形的内角和定理得∠C＋∠DBC＋∠CDB＝∠F＋∠DEF＋∠EDF，又∵∠CDB＝∠EDF，∴30°＋∠DBC＝40°＋90°，∴∠DBC＝100°.方法总结：本题主要利用了“直角三角形两锐角互余”的性质和三角形的内角和定理，熟记性质并准确识图是解题的关键．三、板书设计1．三角形的内角和定理：三角形的内角和等于180°.2．三角形内角和定理的证明3．直角三角形的性质：直角三角形两锐角互余．本节课通过一段对话设置疑问，巧设悬念，激发起学生获取知识的求知欲，充分调动学生学习的积极性，使学生由被动接受知识转为主动学习，从而提高学习效率．然后让学生自主探究，在教学过程中充分发挥学生的主动性，让学生提出猜想．在教学中，教师通过必要的提示指明学生思考问题的方向，在学生提出验证三角形内角和的不同方法时，教师注意让学生上台演示自己的操作过程和说明自己的想法，这样有助于学生接受三角形的内角和是180°这一结论
北师大初中八年级数学下册等腰三角形的判定与反证法教案
方法总结：本题结合三角形内角和定理考查反证法，解此题关键要懂得反证法的意义及步骤．反证法的步骤是：(1)假设结论不成立；(2)从假设出发推出矛盾；(3)假设不成立，则结论成立．在假设结论不成立时要注意考虑结论的反面所有可能的情况．如果只有一种，那么否定一种就可以了，如果有多种情况，则必须一一否定．三、板书设计1．等腰三角形的判定定理：有两个角相等的三角形是等腰三角形(等角对等边)．2．反证法(1)假设结论不成立；(2)从假设出发推出矛盾；(3)假设不成立，则结论成立．解决几何证明题时，应结合图形，联想我们已学过的定义、公理、定理等知识，寻找结论成立所需要的条件．要特别注意的是，不要遗漏题目中的已知条件．解题时学会分析，可以采用执果索因(从结论出发，探寻结论成立所需的条件)的方法.
北师大初中九年级数学下册三角函数的计算2教案
解在角度单位状态为“度”的情况下（屏幕显示出 ），按下列顺序依次按键：显示结果为36.538 445 77.再按键：显示结果为36゜32′18.4.所以，x≈36゜32′.例5 已知cot x=0.1950,求锐角x.（精确到1′）分析根据tan x＝ ，可以求出tan x的值，然后根据例4的方法就可以求出锐角x的值.四、课堂练习1. 使用计算器求下列三角函数值.（精确到0.0001）sin24゜,cos51゜42′20″,tan70゜21′,cot70゜.2. 已知锐角a的三角函数值，使用计算器求锐角a.（精确到1′）（1）sin a=0.2476; （2）cos a=0.4174;（3）tan a=0.1890; （4）cot a=1.3773.五、学习小结内容总结不同计算器操作不同，按键定义也不一样。同一锐角的正切值与余切值互为倒数。在生活中运用计算器一定要注意计算器说明书的保管与使用。方法归纳在解决直角三角形的相关问题时，常常使用计算器帮助我们处理比较复杂的计算。
九年级下册道德与法治世界舞台上的中国2作业设计
(四) 作业分析与设计意图这是一项基于素质教育导向的整体式课时作业设计，结合信息技术下的思政课与信息 技术的深度有效融合，不仅完成了培育学生课程核心素养提高政治认同的目标，而且有效 的激发了学生的学习兴趣。作业以学生的“微型讨论会”为主要情境，设置了三项任务，层层 递进，螺旋式上升。作业以填写“活动记录”的形式呈现。教师从“掌握必备知识， 理论联系实 际 ”“培养核心素养，提高政治认同”等 5 个维度对作业进行评价，以“优秀”“良好” “合格”三个等级呈现。学生通过“微型讨论会”的方式，畅谈自己对中国在国际社会中的 地位和作用及相关外交政策的了解，通过该作业设计，教师可以引导学生关注国家和世界 局势，树立正确的人生观，世界观和价值观。 以增强学生的政治认同和责任意识。
九年级下册道德与法治世界舞台上的中国4作业设计
8. 2022 年，俄乌冲突以来，美方不断泛化国家安全概念，滥用出口管制措施， 多次以所谓“人权”等为由，对中国企业无理打压，严重破坏国际经贸规则。 同时美国不顾中方多次警告，将航母驶入南海进行挑衅，美国国会操弄“台湾地图牌” 。面对美方的无端打压和干涉，我国应该 ( )A.谦让机遇，合作共赢，与美国共发展B.抓住机遇，迎接挑战，积极谋求发展C.集中力量，增强实力，掌控世界趋势D.主动迎击，不畏强权，巩固霸主地位9． 中华诗词浓缩了中华文化的精华，经过岁月的沉淀仍然闪烁着时代的光芒。 从下列经典诗句中得到的启示，你认为不正确的是 ( )A.“万物并育而不相害，道并行而不相悖”—在国际交往中我国要坚持合作、共赢的理念，做到互信互利 B.“国虽大，好战必亡；天下虽平，忘战必亡”— 中国要屹立于世界民族之林，必须通过战争树立国际地位C.“天与不取，反受其咎；时至不行，反受其殃”—机遇稍纵即逝，我们要抓住机遇，勇于创新，追求发展D.“同心掬得满庭芳”—各族人民要铸牢中华民族共同体意识，手足相亲、守望相助10．从漫画“新四大发明”中，下列认识和理解正确的有 ( )①我们要培育壮大经济发展新动能②我国把提升发展质量放在首位③中国决定着世界经济发展的趋势④中国与世界各国共享发展成果
九年级下册道德与法治世界舞台上的中国1作业设计
A.大力深化大数据、人工智能等研发应用B.高举新时代改革开放旗帜,继续全面深化改革、全面扩大开放C.加强国际交流与合作,培育竞争新优势D.建立更加公平、更可持续的社会保障制度 2、发展是解决我国一切问题的基础和关键。全面建设社会主义现代化国家,必须始终抓好发展 这个基础和关键。中国积极谋求发展,就必须 ( )①引领、主导全球规则的制定②要加快构建以国内大循环为主体、国内国际双循环相互促进的新发展格局③掌握国际竞争主动权④积极寻求新的经济增长点A. ①②③ B.①②④ C.①③④ D.②③④3、“中国制造2025”构想的提出,对于中国传统制造业的转型升级影响深远。新一代信息技术 和传统工业的深度融合已成为中国新一轮制造发展制高点,我们要把智能制造作为中国制造未 来的主攻方向,实现由“中国制造”向“中国创造”“中国智造”转型。这有利于 ( )①促进我国经济实现由实体经济向虚拟经济转变②通过新技术将传统产业打造为高新技术产业③推动传统产业优化升级,从而进一步提升我国在全球分工中的地位④催生新兴产业,形成新的经济增长点
北师大初中七年级数学下册用科学记数法表示较小的数教案
方法总结：绝对值小于1的数也可以用科学记数法表示，一般形式为a×10－n，其中1≤a<10，n为正整数．与较大数的科学记数法不同的是其所使用的是负整数指数幂，指数由原数左边起第一个不为零的数前面的0的个数所决定．【类型二】 将用科学记数法表示的数还原为原数用小数表示下列各数：(1)2×10－7; (2)3.14×10－5；(3)7.08×10－3; (4)2.17×10－1.解析：小数点向左移动相应的位数即可．解：(1)2×10－7＝0.0000002；(2)3.14×10－5＝0.0000314；(3)7.08×10－3＝0.00708； (4)2.17×10－1＝0.217.方法总结：将科学记数法表示的数a×10－n还原成通常表示的数，就是把a的小数点向左移动n位所得到的数．三、板书设计用科学记数法表示绝对值小于1的数：一般地，一个小于1的正数可以表示为a×10n，其中1≤a<10，n是负整数．从本节课的教学过程来看，结合了多种教学方法，既有教师主导课堂的例题讲解，又有学生主导课堂的自主探究．课堂上学习气氛活跃，学生的学习积极性被充分调动，在拓展学生学习空间的同时，又有效地保证了课堂学习质量
人教部编版七年级下册写作写出人物的精神教案
我来到书房，找到了字典，既想快点知晓答案，和妈妈比个胜负，又想慢点儿，万一又错了怎么办。我紧张地翻开字典，找到了“偌”字的读音。天呐，我是对的，我太开心了！（不足1：缺少动作描写，没有展现出“我”的紧张。修改：我使劲地捏着字典，颤抖着双手，慢慢地打开字典。不足2：结尾缺少人物的语言和神态描写，没有展现出人物开心的心理。修改：我眉飞色舞地大叫道：“天呐，我赢啦！我赢啦！”）我捧着字典，连蹦带跳地来到妈妈面前，欣喜若狂地说：“妈妈，你想不到吧，你一个堂堂初中老师，居然败在拼音不太好的女儿手下。哈哈，我终于报‘仇’了……”此时的我，简直比中了五百万还要开心一百倍。妈妈一听便傻了眼，刚才那坚定的神情已经荡然无存，妈妈连忙接过字典看了又看，生怕我看错了似的。看到字典上的读音，妈妈哑口无言。
人教部编版语文九年级下册蒲柳人家（节选）教案
刘绍棠，中国当代著名乡土文学作家，1936年2月出生于河北通县（今北京通州区）大运河畔的儒林村，1949年开始发表作品，一生留下了500多万字的乡土文学作品，包括《地火》《京门脸子》等多部长篇小说，《蒲柳人家》《运河的桨声》等多部中篇小说，以及《青枝绿叶》《蛾眉》等多部短篇小说集。他的作品在国内多次获奖，在国际上亦有影响。刘绍棠的作品内容各不相同，但都艺术地再现了其家乡大运河畔不同历史时期的风土人情和社会风貌，描绘了充满诗情画意的乡风水色、世俗人情。20世纪80年代以来，刘绍棠不遗余力地倡导乡土文学，创作上坚持“中国气派，民族风格，地方特色，乡土题材”。文学评论家指出，他的作品格调清新淳朴，乡土色彩浓郁，形成了独具特色的大运河乡土文学风格。
人教部编版语文八年级下册庆祝奥林匹克运动复兴25周年教案
（3）推荐男女生代表各一位在全班进行演讲展示。 （4）围绕“讲”和“演”两方面的技巧，点评演讲效果。（生开展演讲活动，师指导）【设计意图】本环节通过集中梳理演讲技巧，并设计演讲技巧进行演讲展示，引导学生将理论知识逐步运用于具体的演讲实践中，提高学生的演讲能力。五、总结存储1.教师总结现代奥林匹克运动的创始人顾拜旦面对世界政治格局剧变的局面，以战略家的视野指出奥林匹克精神的内涵与价值，用诗歌般的语言阐述了奥林匹克平和自信的内涵，提出了奥林匹克运动的宗旨是教育，是面向大众，是促进和平、公平、公正。他激情澎湃地畅想美好前景，确信奥林匹克精神必将如阳光般普照大地。整篇演讲词站位高、格局广，语言庄重、典雅，值得我们用心体会。2.布置作业学校即将举行春季运动会，如果你被邀请在运动会的开幕式上作为学生代表发言，你将如何演讲？结合你对奥林匹克运动的精神的理解，写一篇300字左右的演讲词，并适当设计一些演讲技巧。
人教版新目标初中英语七年级下册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?
人教版新目标初中英语七年级下册I ’d like some noodles教案
教学过程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”
人教版新目标初中英语七年级下册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.教学反思：通过本单元的学习，学生基本可以谈论人们的国籍，居住城市及其所说的语言，通过书信方式去介绍自己并寻找笔友。但在涉及到国外的一些城市时，学生对这方面的知识相对欠缺，能介绍的城市并不多，也反应出学生课前预习不充分，这跟学生学习条件也有关，大多数学生无法通过网络获取所需信息。因此，在以后的教学中要多指导学生通过计算机网络获取信息，拓宽知识面。
人教版新目标初中英语八年级下册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
人教版新目标初中英语八年级下册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.
人教版新目标初中英语八年级下册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.
人教版新目标初中英语八年级下册Why don’t you get her a scarf教案
教师带领学生复习有关描述宠物的词汇，采用教师提问学生回答的方进行。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？然后学生进行 pairwork 练习。Task two: 师生互动，学习探究 1、播放3a部分的录音，引导学生一边听录音，一边跟读。2、通过听录音学生回答以下问题：Why do you think pot-bellied pigs are popular？What are the advantages and disadvantages of keeping such a pet？教师对学生的回答进行及时点评。3．学习范文，学习重点短语，为下步的模仿写作提供语言素材。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.(图)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
人教版新目标初中英语八年级下册Would you mind turning down the music教案
Step 4. Group work (4)1. Ask a pair of students to read the dialogue. Say, This activity provides speaking, listening and writing practice using the target language.2. Ask students to complete the work in groups.3. Check the answers with the whole class. 4. Explain some of the language points. Step 5. Word review (Self check 1)1. Ask students to read the words and the phrases given. 2. Fill in the blanks with proper forms of these words to complete the sentences. 3. Check the answers with the whole class. Homework:Do activity 2 on page 57 after class. Period 6Teaching aims: 1. Teach vocabulary words and the useful expressions. 2. Enable the students to learn etiquette in different culture. 3. Help the students learn how to behave politely in public places and in daily life. Teaching procedures:Step 1. RevisionHelp students to review the function of making requests through a free talk. Then lead them to the topic of etiquette. Explain the meaning of etiquette. Or, ask students to look it up in the dictionary. Step 2. Pre-reading (Section 1)1. Ask students to read the picture and make a list with their partner about how many rules of etiquette can be seen being broken.
人教版新目标初中英语九年级下册Rainy days make me sad教案
1. 教材分析本单元以how do things affect you？为话题, 从颜色、天气、音乐、广告、产品等方面谈论了外界事物如何影响人的心情。要求学生掌握表达某物或某事给人带来的感觉、看法或影响等。共设计了四个部分的内容：Section A 该部分有4个模块：第一模块围绕Which restaurant would you like to go to?这一话题展开思维（1a）、听力（1b）、口语（1c）训练；第二模块围绕How does music affect you? 进行听力（2a-2b）、口语训练（2c）；第三模块继续围绕how do colors in the restaurant affect you这一话题展开训练，训练形式为阅读和问题体验（3a）和小组活动（3b）；第四模块仍就How do things affect you这一话题以调查的形式展开讨论。Section B该部分有4个模块：第一模块围绕产品广告对人们的影响这一话题以“配对”（1a）与“列举”（1b）两种形式展开训练；第二模块继续围绕How do things affect you? 进行听力（2a-2b）、口语对话训练（2c）；第三模块围绕“Advertising”这一话题展开阅读（3a-3b）和写作（3c）训练；第四模块围绕How posters affect you这一话题以口语训练形式展开小组活动。
