-
北师大初中七年级数学下册用尺规作三角形教案
【类型三】 已知三边作三角形已知三条线段a、b、c，用尺规作出△ABC，使BC＝a，AC＝b、AB＝c.解：作法：1.作线段BC＝a；2．以点C为圆心，以b为半径画弧，再以B为圆心，以c为半径画弧，两弧相交于点A；3．连接AC和AB，则△ABC即为所求作的三角形，如图所示．方法总结：已知三角形三边的长，根据全等三角形的判定“SSS”，知三角形的形状和大小也就确定了．作三角形相当于确定三角形三个顶点的位置．因此可先确定三角形的一条边(即两个顶点)，再分别以这条边的两个端点为圆心，以已知线段长为半径画弧，两弧的交点即为另一个顶点．三、板书设计1．已知两边及其夹角作三角形2．已知两角及其夹边作三角形3．已知三边作三角形本节课学习了有关三角形的作图，主要包括两种基本作图：作一条线段等于已知线段，作一个角等于已知角．作图时，鼓励学生一边作图，一边用几何语言叙述作法，培养学生的动手能力、语言表达能力
北师大初中九年级数学下册弧长及扇形的面积教案
1．了解扇形的概念，理解n°的圆心角所对的弧长和扇形面积的计算公式并熟练掌握它们的应用；(重点)2．通过复习圆的周长、圆的面积公式，探索n°的圆心角所对的弧长l＝nπR180和扇形面积S扇＝nπR2360的计算公式，并应用这些公式解决一些问题．(难点)一、情境导入如图是圆弧形状的铁轨示意图，其中铁轨的半径为100米，圆心角为90°.你能求出这段铁轨的长度吗(π 取3.14)?我们容易看出这段铁轨是圆周长的14，所以铁轨的长度l≈2×3.14×1004＝157(米). 如果圆心角是任意的角度，如何计算它所对的弧长呢？二、合作探究探究点一：弧长公式【类型一】 求弧长如图，某厂生产横截面直径为7cm的圆柱形罐头盒，需将“蘑菇罐头”字样贴在罐头侧面．为了获得较佳视觉效果，字样在罐头盒侧面所形成的弧的度数为90°，则“蘑菇罐头”字样的长度为()
北师大初中九年级数学下册圆内接正多边形教案
解析：正多边形的边心距、半径、边长的一半正好构成直角三角形，根据勾股定理就可以求解．解：(1)设正三角形ABC的中心为O，BC切⊙O于点D，连接OB、OD，则OD⊥BC，BD＝DC＝a.则S圆环＝π·OB2－π·OD2＝πOB2－OD2＝π·BD2＝πa2；(2)只需测出弦BC(或AC，AB)的长；(3)结果一样，即S圆环＝πa2；(4)S圆环＝πa2.方法总结：正多边形的计算，一般是过中心作边的垂线，连接半径，把内切圆半径、外接圆半径、边心距，中心角之间的计算转化为解直角三角形．变式训练：见《学练优》本课时练习“课后巩固提升”第4题【类型四】 圆内接正多边形的实际运用如图①，有一个宝塔，它的地基边缘是周长为26m的正五边形ABCDE(如图②)，点O为中心(下列各题结果精确到0.1m)．(1)求地基的中心到边缘的距离；(2)已知塔的墙体宽为1m，现要在塔的底层中心建一圆形底座的塑像，并且留出最窄处为1.6m的观光通道，问塑像底座的半径最大是多少？
部编版语文九年级上册《中国人失掉自信力了吗》教案
一、导入新课我们已经学过鲁迅先生的不少文章，学过他的小说，看他用无数生动的形象表达他在时代里的“呐喊”与“彷徨”；学过他的散文，与他一同在失落中“朝花夕拾”，安静地回忆过往。今天，我们将学习鲁迅先生的一篇杂文，看他是如何作为民族斗士，将手中的笔，变成抨击敌人的枪。二、教学新课目标导学一：学习驳论，理清思路1．初读课文，找出对方的错误观点，并说说作者是怎样引出这一观点的。明确：对方的错误观点是“中国人失掉自信力了”。开篇以似乎确凿的事实为据，用一句话指出了三个阶段中“中国人”表现出来的三种不同的态度：盲目骄傲，夜郎自大；盲目崇拜，借助外援；今不如昔，祈求鬼神。即由自夸到崇洋，到自欺欺人、虚无渺茫的态度变化。因此有人“慨叹”：“中国人失掉自信力了。”这是论敌的论点。
人教版新目标初中英语七年级上册Can you play the guitar教案
本单元主要是学习情态动词can的肯定句、否定句、一般疑问句，肯定与否定回答，以及特殊疑问句的构成和用法；复习what弓！导的特殊疑问句。本单元主要围绕“加人俱乐部，谈论自己的能力”这一话题，设计了三个任务型活动：任务一是：自己的才艺表演，学习情态动词can的用法；任务二是：自己建立俱乐部，运用情态动词can谈论自己在某一方面的能力、喜好和意愿；任务三是：我能成功，主要是复习巩固谈论各自的爱好和特长的方法。单元知识系统（树）Can you/he/she/you dance? 一Yes，I/he/she/we can．／No，I/he/she/we can’t．Can Bill play the guitar?一Yes，he can，but he can’t sing．单元总体目标通过学习情态动词can的用法，使学生能够表达自己在某一方面所具备的才能；能够谈论自己的喜好与意愿；能够为自己成立的各种俱乐部制作海报；会写招聘广告。单元重难点一览重点 难点I．复习词汇：can，play，want2.词汇：guitar, dance, swim，sing, chess, speak, drum，trumpet，violin，play the guitar3．句型：Can you/he/she/you dance?Yes，I/he/she/we can．／No，I/he/she/we can’t．Can Bill play the guitar?
人教版新目标初中英语七年级上册How much are these pants教案
个性练习设计 阅读广告：在日常生活中，人们去买东西之前，一般要阅读广告，从广告中获取该商品的一些有用信息，包括价格、性能等。所以给学生提供有些商品的广告或让学生去商店去阅读一些商品的广告，从中获取商品的价格，即可以锻炼学生的阅读能力，又能提高实践能力。 Self Check 教学内容 Self Check(教材P42) 教学目标 知识与能力 复习词汇pant，sock，T-shirt，sweater，shoes，color，black，white，red，green，blue，big，short，long，数字10--31； 学习词汇Zig Zag，clothes，shop，yellow，ask，which；学会谈论服装的价格、颜色、大小和长短；学会填写价格标签。 过程与方法 运用Summarizing和Classifying的学习策略。在复习教学中，运用听写、绘画、互相询问调查与检测等手段，促使学生不断地使用所学内容，从而提高他们灵活运用知识的能力。 情感态度价值观 该部分学习内容主要是复习谈论服装的价格和颜色以及对服装的喜好，能引起学生的共鸣；通过购物的对话练习教学生学会购物时使用的礼貌用语和如何感谢人。
人教版新目标初中英语七年级上册What time do you go to school教案
知识与能力复习词汇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；引导学生复习、巩固“询问和谈论时间”的目标语言并运用所学知识安排自己的学习和课外活动。过程与方法运用Summarizing，Classifying和Comparing的学习策略。在复习教学中，运用听写、提问、对话演练与调查活动，促使学生不断地使用所学内容，从而提高他们灵活运用知识的能力。情感态度价值观本部分的主要内容是复习“日常作息时间”的询问和表达。通过互相询问或谈论自己或对方的作息时间安排和活动计划，培养学生良好的作息习惯和守时习惯。教学重、难点及教学突破重点复习词汇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；引导学生复习、巩固“询问和谈论时间”的目标语言。
人教版新目标初中英语八年级上册Can you come to my party教案3篇
Step 3 (3b)First, tell the students when we talk about our future plans, we often use: I’m+verb+ing When we talk about what we must do, we use have to. Ask the students to fill in the blanks in 3b. The answers are: shopping, go to see, a test, I’m going, my family. Step 4 (3c)Let the students write an e-mail message to a friend. Say why you can’t visit next. Before the exercise, ask the students to give some possible answers and write them on the blackboard. So the students will feel easy to finish the writing exercise. After they finish it, Let them to correct it in groups first. Each group chooses theirs best one to read in front of the whole class. Step 5 ( planning a party )First read the conversation in the box together. Then ask the students to turn to page 88.Write down everything you have to do next week. Write in all the things you have to do . Ask the students to look at the list. Ask them “What day are you free?” This is when you can have your party. Step 6 (Self check 1 )Let the students to fill in the blanks with the words given. Change the forms of the words if possible. Then make their own sentences. The answers are: visit, playing, have to, study, comeStep 7 (Self check 2)Imagine you are Marie. Read the information and look at your schedule. Write replies to the invitation.
人教版新目标初中英语八年级上册How do you make a banana milk shake教案2篇
1. First, ... then, ... next, ... finally, ...首先，……然后，……接着，……最后，……这是英语中表达做某事的步骤的一种说法。如果步骤较多，还可以说：first-next-after that-later on-finally/at last通常你会听到说英语国家的人在说 first, next, then, finally 和后面的内容时，他们会做一些停顿。这样就能提前告诉听者接下来讲的是一系列的步骤。这一点在朗读和听力中应特别注意。2. how many, how much均为疑问词，同是“多少”，但用法不同。请看：how many修饰可数名词复数，how much修饰不可数名词。但在用法上，同学们常犯如下错误：1) [误] 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是形容词，常修饰名词作定语，故后面跟名词。2) [误]How much tea are there on the table?[正]How much tea is there on the table?[析] how much修饰不可数名词时，谓语动词用单数。how many与how much的区别可简记为：前how many：问“多少”，复数名词后面跑；how much问“多少”，不可数名词单数好。前者答语用基数词，后者答语用数量关系。
人教版新目标初中英语八年级上册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
人教版新目标初中英语八年级上册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.…how far from school she lives.…how long it takes to get to school.…how she gets to school.…what she thinks of the transportation.(2) Tell students what transportation and bus stop mean.bus stop 汽车站 transportation n. 运送；运输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.
人教版新目标初中英语八年级上册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. 现在进行时表示将来计划或行动. 4. 特殊疑问句（where , when , how long引导） 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. 用第三人称练习对话.
人教版新目标初中英语八年级上册I’m going to be a basketball player教案3篇
教学目标1.知识目标：（1）学习What are you going to be when you grow up?/How are you going to do that?句式。（2）学会用英语描述有关职业的表达法。2.能力目标：（1）能够谈论为实现理想所做出的打算和安排。（2）能够谈论未来自己与他人理想的职业及原因。（3）能用英语描述课余时间的活动安排，最终具备表达综合信息的能力。3.情感目标：新学期到来之际，让他们在学习、体育、饮食、特长、读书等方面制定计划，教育学生合理安排自己的课外生活，思考自己的理想职业及适合自己的职业。教学重点、难点本单元的重点为“be going to”表将来,want to be, what,where, when,how引导的特殊疑问句。难点是语言目标的实现。教材分析本单元以I am going to be a basketball player为话题，共设计了三部分的内容：一、Section A该部分有4个模块。第一模块围绕Do you think these jobs are interesting?这一话题展开思维（1a）、听力（1b）、口语（1c）训练；
人教版新目标初中英语八年级上册I’m more outgoing than my sister教案2篇
1 交通工具的比较此活动为小组活动。学生通过讨论找出到达某一城市可乘坐的各种交通工具，并选择最佳出行方式。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.操作建议：（1）学生以小组为单位展开活动，谈论本组所选择的交通工具。（2）各组选代表向全班汇报，阐述本组所选择的交通工具的利和弊。完成任务所需要的语言结构：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 哪个城市更合适？此活动具有挑战性。假设中国要举行2014年世界杯足球赛，分别从历史，人文，天气等方面对各城市（北京，大连，上海，昆明）进行比较，选择最佳举办城市。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.
人教版新目标初中英语八年级上册What’s the best radio station教案2篇
教学重点和难点：运用所掌握的语言描述，比较不同地点的特点。在练习中学习掌握英语比较级和最高级的用法。课前准备分配小组,每组五至六人。通过上网或翻阅报刊杂志等方法，确定旅游线路，做出基本的旅游计划。教学设计：本节课流程图 学法指导：1．由于这是一堂新课，在教学中应注意面向全体，发挥学生的主体性，引导学生积极参与，激发学生的求知欲和学习积极性，指导学生积极思维，主动获取知识，养成良好的学习方法。逐步学会独立解决问题。总之要尽可能调动学生的非智力因素促进智力因素的发展。教法选择：1．电化教学法2．课堂讨论法3．任务型教学法采用这些方法的目的是为了充分调动学生的学习积极性，使学生变被动学习为主动学习。通过电脑形象的演示，加强印象，提高兴趣，突破难点，提高教学效率，进而增大教学的容量和信息量。充分体现教师为主导，学生为主体的教学原则。
人教版新目标初中英语九年级上册I like music that I can dance to教案
教学目标: 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 语言功能： 1) Talk about one’s preferences, using t he relative clause2) Talk about people’s likes and dislikes and the reasons3) Talk about opinions语言结构： Relative clauses with that and who语言目标：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.重点词汇及短语：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教学重难点：What do other people think of the different kinds of things? How to express one’s opinions? 学习方式：讨论，合作学习情感目标：通过本单元的学习，能提高学生的艺术鉴赏能力和审美情趣，并引导学生养成健康的饮食习惯。课时安排5课时第一课时：Section A: 1a-2c第二课时：Section A : 3a-4第三课时：Section B:1-2c, Self check2第四课时：Section B: 3a-4, Self check1第五课时：Self check ReadingI like music that I can dance to.
人教版新目标初中英语九年级上册I used to be afraid of the dark教案
内容提示1．本单元主要内容是学会used to结构。Used to +动词原形表示过去经常、以前常常，只用于过去式中，用来表示现在已不存在的习惯或状态。例如：They used to play football together．他们过去常在一起蹋足球。（现在不在一起踢了)2．used to的疑问形式和否定形式为Did you use to…?和I didn’t use to… 也可以用Used you to…?和I used not to…但现在多使用前者。例如：Did you used to swim in the river? 你过去常在河里游泳吗?I didn’t use to play the piano． 我以前并不经常弹钢琴。教学目标一、学习目标（Language Goal） 1．学会陈述自己过去常做的事情。2．学会陈述自己过去的爱好等。3．能够表达自己现在和过去在外表、性格、娱乐等方面的变化。4．能够表达朋友、家人等现在和过去的变化。二、语言结构（Language Structures） 1．I used to be short when I was young. 我年轻时个子很矮。 2． —Did you use to have straight hair? 你过去是直发吗？—Yes, I did. 是的。 3． —Did you use to play the piano? 你过去弹钢琴吗？—No, I didn’t. 不，我不弹。 4．I used to be afraid of dark. 我过去害怕黑暗。 5．I’m terrified of the snakes. 我害怕蛇。
人教版新目标初中英语九年级上册How do you study for a test教案2篇
内容提示本单元主要内容是学会利用verb十by／with gerund表示方式方法来讨论学习英语的策略，认识自己在学习方面的长处和不足。初步了解现在完成时的结构和用法。现在完成时由助动词have／has+动词的过去分词构成，主要表示过去发生的某一动作对现在仍有影响或造成的后果，常与already，yet，just，ever，never等副词连用。教学目标一、学习目标（Language Goal） 1. Talk about how to study . 学会讨论各种学习方法和策略。2. Find out your suitable learning methods. 找出适合自己的学习方法。 二、语言结构（Language Structures） 1. Verb + by with gerund by＋动名词短语 表示“通过…途径，方法” 2. How questions have引导的特殊疑问句 三、目标语言（Target Language） 1. How do you study for tests ? 你是怎样准备考试的？Well , I study by working with my classmates. 哦，我和同学们一起学习。2. Have you ever studied with a group ? 你曾经参加过学习小组吗？Yes , I have . I’ve learned a lot that way . 是的，参加过。通过这种方式我学了许多。
人教版新目标初中英语九年级上册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
人教部编版道德与法制五年级上册美丽文字，民族瑰宝
学生阅读欣赏教材第66页王羲之的《兰亭集序》和柳公权的《玄秘塔碑》，然后，教师引导学生说说自己喜欢的字体，并将课前搜集到的字帖或者自己的书法作品与同学分享。设计意图：引导学生欣赏汉字的书法艺术，体验书法的艺术美。环节三：课堂小结，内化提升学生谈一谈学习本节课的收获，教师相机引导。设计意图：梳理总结，体验收获与成功的喜悦，内化提升学生的认识与情感。环节四：布置作业，课外延伸课后，以古老而优美的汉字为主题办一期手抄报。设计意图：将课堂所学延伸到学生的日常生活中，有利于落实行为实践。六、板书设计为了突出重点，让学生整体上感知本节课的主要内容，我将以思维导图的形式设计板书：在黑板中上方的中间位置是课题《美丽文字，民族瑰宝》，下面是：直观形象，生动多姿；形体优美，风格迥异。
