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北師大初中九年級(jí)數(shù)學(xué)下冊(cè)二次函數(shù)y=x2和y=-x2的圖象與性質(zhì)1教案
雨后天空的彩虹、河上架起的拱橋等都會(huì)形成一條曲線．問(wèn)題1：這些曲線能否用函數(shù)關(guān)系式表示？問(wèn)題2：如何畫出這樣的函數(shù)圖象？二、合作探究探究點(diǎn)：二次函數(shù)y＝x2和y＝－x2的圖象與性質(zhì)【類型一】 二次函數(shù)y＝x2和y＝－x2的圖象的畫法及特點(diǎn)在同一平面直角坐標(biāo)系中，畫出下列函數(shù)的圖象：(1)y＝x2；(2)y＝－x2.根據(jù)圖象分別說(shuō)出拋物線(1)(2)的對(duì)稱軸、頂點(diǎn)坐標(biāo)、開(kāi)口方向及最高(低)點(diǎn)坐標(biāo)．解析：利用列表、描點(diǎn)、連線的方法作出兩個(gè)函數(shù)的圖象即可．解：列表如下：x y) －2 －1 0 1 2y＝x2 4 1 0 1 4 y＝－x2 －4 －1 0 －1 －4 描點(diǎn)、連線可得圖象如下：(1)拋物線y＝x2的對(duì)稱軸為y軸，頂點(diǎn)坐標(biāo)為(0，0)，開(kāi)口方向向上，最低點(diǎn)坐標(biāo)為(0，0)；(2)拋物線y＝－x2的對(duì)稱軸為y軸，頂點(diǎn)坐標(biāo)為(0，0)，開(kāi)口方向向下，最高點(diǎn)坐標(biāo)為(0，0)．方法總結(jié)：畫拋物線y＝x2和y＝－x2的圖象時(shí)，還可以根據(jù)它的對(duì)稱性，先用描點(diǎn)法描出拋物線的一側(cè)，再利用對(duì)稱性畫另一側(cè)．
北師大初中九年級(jí)數(shù)學(xué)下冊(cè)二次函數(shù)y=ax2+bx+c的圖象與性質(zhì)1教案
解析：(1)已知拋物線解析式y(tǒng)＝ax2＋bx＋0.9，選定拋物線上兩點(diǎn)E(1，1.4)，B(6，0.9)，把坐標(biāo)代入解析式即可得出a、b的值，繼而得出拋物線解析式；(2)求出y＝1.575時(shí)，對(duì)應(yīng)的x的兩個(gè)值，從而可確定t的取值范圍．解：(1)由題意得點(diǎn)E的坐標(biāo)為(1，1.4)，點(diǎn)B的坐標(biāo)為(6，0.9)，代入y＝ax2＋bx＋0.9，得a＋b＋0.9＝1.4，36a＋6b＋0.9＝0.9，解得a＝－0.1，b＝0.6.故所求的拋物線的解析式為y＝－0.1x2＋0.6x＋0.9；(2)157.5cm＝1.575m，當(dāng)y＝1.575時(shí)，－0.1x2＋0.6x＋0.9＝1.575，解得x1＝32，x2＝92，則t的取值范圍為32＜t＜92.方法總結(jié)：解答本題的關(guān)鍵是注意審題，將實(shí)際問(wèn)題轉(zhuǎn)化為求函數(shù)問(wèn)題，培養(yǎng)自己利用數(shù)學(xué)知識(shí)解答實(shí)際問(wèn)題的能力．三、板書設(shè)計(jì)二次函數(shù)y＝ax2＋bx＋c的圖象與性質(zhì)1．二次函數(shù)y＝ax2＋bx＋c的圖象與性質(zhì)2．二次函數(shù)y＝ax2＋bx＋c的應(yīng)用
北師大初中九年級(jí)數(shù)學(xué)下冊(cè)二次函數(shù)y=ax2+bx+c的圖象與性質(zhì)2教案
1．使學(xué)生掌握用描點(diǎn)法畫出函數(shù)y＝ax2＋bx＋c的圖象。2．使學(xué)生掌握用圖象或通過(guò)配方確定拋物線的開(kāi)口方向、對(duì)稱軸和頂點(diǎn)坐標(biāo)。讓學(xué)生經(jīng)歷探索二次函數(shù)y＝ax2＋bx＋c的圖象的開(kāi)口方向、對(duì)稱軸和頂點(diǎn)坐標(biāo)以及性質(zhì)的過(guò)程，理解二次函數(shù)y＝ax2＋bx＋c的性質(zhì)。用描點(diǎn)法畫出二次函數(shù)y＝ax2＋bx＋c的圖象和通過(guò)配方確定拋物線的對(duì)稱軸、頂點(diǎn)坐標(biāo)理解二次函數(shù)y＝ax2＋bx＋c(a≠0)的性質(zhì)以及它的對(duì)稱軸(頂點(diǎn)坐標(biāo)分別是x＝－b2a、(－b2a，4ac－b24a)一、提出問(wèn)題1．你能說(shuō)出函數(shù)y＝－4(x－2)2＋1圖象的開(kāi)口方向、對(duì)稱軸和頂點(diǎn)坐標(biāo)嗎？(函數(shù)y＝－4(x－2)2＋1圖象的開(kāi)口向下，對(duì)稱軸為直線x＝2，頂點(diǎn)坐標(biāo)是(2，1)。2．函數(shù)y＝－4(x－2)2＋1圖象與函數(shù)y＝－4x2的圖象有什么關(guān)系?(函數(shù)y＝－4(x－2)2＋1的圖象可以看成是將函數(shù)y＝－4x2的圖象向右平移2個(gè)單位再向上平移1個(gè)單位得到的)
北師大初中九年級(jí)數(shù)學(xué)下冊(cè)二次函數(shù)y=a(x-h)2+k的圖象與性質(zhì)1教案
(3)設(shè)點(diǎn)A的坐標(biāo)為(m，0)，則點(diǎn)B的坐標(biāo)為(12－m，0)，點(diǎn)C的坐標(biāo)為(12－m，－16m2＋2m)，點(diǎn)D的坐標(biāo)為(m，－16m2＋2m)．∴“支撐架”總長(zhǎng)AD＋DC＋CB＝(－16m2＋2m)＋(12－2m)＋(－16m2＋2m)＝－13m2＋2m＋12＝－13(m－3)2＋15.∵此二次函數(shù)的圖象開(kāi)口向下，∴當(dāng)m＝3米時(shí)，“支撐架”的總長(zhǎng)有最大值為15米．方法總結(jié)：解決本題的關(guān)鍵是根據(jù)圖形特點(diǎn)選取一個(gè)合適的參數(shù)表示它們，得出關(guān)系式后運(yùn)用函數(shù)性質(zhì)來(lái)解．三、板書設(shè)計(jì)二次函數(shù)y＝a(x－h(huán))2＋k的圖象與性質(zhì)1．二次函數(shù)y＝a(x－h(huán))2＋k的圖象與性質(zhì)2．二次函數(shù)y＝a(x－h(huán))2＋k的圖象與y＝ax2的圖象的關(guān)系3．二次函數(shù)y＝a(x－h(huán))2＋k的應(yīng)用要使課堂真正成為學(xué)生展示自我的舞臺(tái)，還學(xué)生課堂學(xué)習(xí)的主體地位，教師要把激發(fā)學(xué)生學(xué)習(xí)熱情和提高學(xué)生學(xué)習(xí)能力放在教學(xué)首位，為學(xué)生提供展示自己聰明才智的機(jī)會(huì)，使課堂真正成為學(xué)生展示自我的舞臺(tái)．充分利用合作交流的形式，能使教師發(fā)現(xiàn)學(xué)生分析問(wèn)題、解決問(wèn)題的獨(dú)到見(jiàn)解以及思維的誤區(qū)，以便指導(dǎo)今后的教學(xué).
北師大初中九年級(jí)數(shù)學(xué)下冊(cè)二次函數(shù)y=ax2和y=ax2+c的圖象與性質(zhì)1教案
變式訓(xùn)練：見(jiàn)《學(xué)練優(yōu)》本課時(shí)練習(xí)“課堂達(dá)標(biāo)訓(xùn)練”第5題【類型二】 在同一坐標(biāo)系中判斷二次函數(shù)和一次函數(shù)的圖象在同一直角坐標(biāo)系中，一次函數(shù)y＝ax＋c和二次函數(shù)y＝ax2＋c的圖象大致為()解析：∵一次函數(shù)和二次函數(shù)都經(jīng)過(guò)y軸上的點(diǎn)(0，c)，∴兩個(gè)函數(shù)圖象交于y軸上的同一點(diǎn)，故B選項(xiàng)錯(cuò)誤；當(dāng)a＞0時(shí)，二次函數(shù)的圖象開(kāi)口向上，一次函數(shù)的圖象從左向右上升，故C選項(xiàng)錯(cuò)誤；當(dāng)a＜0時(shí)，二次函數(shù)的圖象開(kāi)口向下，一次函數(shù)的圖象從左向右下降，故A選項(xiàng)錯(cuò)誤，D選項(xiàng)正確．故選D.方法總結(jié)：熟記一次函數(shù)y＝kx＋b在不同情況下所在的象限，以及熟練掌握二次函數(shù)的有關(guān)性質(zhì)(開(kāi)口方向、對(duì)稱軸、頂點(diǎn)坐標(biāo)等)是解決問(wèn)題的關(guān)鍵．變式訓(xùn)練：見(jiàn)《學(xué)練優(yōu)》本課時(shí)練習(xí)“課后鞏固提升” 第4題【類型三】 二次函數(shù)y＝ax2＋c的圖象與三角形的綜合
人教版新課標(biāo)小學(xué)數(shù)學(xué)五年級(jí)下冊(cè)設(shè)計(jì)鑲嵌圖案教案
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3課題類型造型表現(xiàn)4教學(xué)目標(biāo)1、認(rèn)識(shí)三原色，讓學(xué)生初步了解三原色的知識(shí)。2、觀察兩個(gè)原色調(diào)和之后產(chǎn)生的色彩變化，說(shuō)出由兩原色調(diào)出的第三個(gè)顏色（間色）3、能夠調(diào)出預(yù)想的色彩，并用它們涂抹成一幅繪畫作品。5重點(diǎn)難點(diǎn)1、引導(dǎo)學(xué)生觀察三原色在相互流動(dòng)中的色彩變化。2、引導(dǎo)學(xué)生進(jìn)行色彩的調(diào)和、搭配。3、培養(yǎng)學(xué)生愛(ài)色彩、善于動(dòng)手、善于觀察、善于動(dòng)腦的能力。
小學(xué)美術(shù)人教版一年級(jí)上冊(cè)《第5課五彩的煙花》教學(xué)設(shè)計(jì)模板說(shuō)課稿
2學(xué)情分析一年級(jí)學(xué)生對(duì)美術(shù)的興趣很高，對(duì)五顏六色的物體特別感興趣，孩子們課前做的準(zhǔn)備很好。3重點(diǎn)難點(diǎn)1.節(jié)日里煙花的畫法。2.油畫棒和水彩顏料相結(jié)合的涂色技巧。教學(xué)活動(dòng)活動(dòng)1【活動(dòng)】教案第5課五彩的煙花
新人教版高中英語(yǔ)必修3Unit 1 Festivals and celebrations-Discovering Useful Structure教學(xué)設(shè)計(jì)
4.That was an experience that frightened everyone. →That was _____________________. 答案：1. taking 2. being discussed 3. in the reading room 4. a frightening experienceStep 6 The meaning and function of V-ing as the predicative動(dòng)詞-ing形式作表語(yǔ)，它通常位于系動(dòng)詞后面，用以說(shuō)明主語(yǔ)“是什么”或“怎么樣”一種表示主語(yǔ)的特質(zhì)、特征和狀態(tài), 其作用相當(dāng)于形容詞; 另一種具體說(shuō)明主語(yǔ)的內(nèi)容, 即主語(yǔ)等同于表語(yǔ), 兩者可互換。The music they are playing sounds so exciting. 他們演奏的音樂(lè)聽(tīng)起來(lái)令人激動(dòng)。The result is disappointing. 結(jié)果令人失望。Our job is playing all kinds of music. 我們的工作就是演奏各種音樂(lè)。Seeing is believing. 眼見(jiàn)為實(shí)。Step 7 Practice1. It is ________(amaze) that the boy is able to solve the problem so quickly.2. Buying a car is simply _______(waste) money. 3. Please stop making the noise—it’s getting ________(annoy). 4. complete the passage with the appropriate -ing form.La Tomatina is a festival that takes place in the Spanish town Bunol every August. I think many food festivals are __________ because people are just eating. however, this festival is _________ because people don't actually eat the tomatoes. Instead, they throw them at each other! the number of people ________ part in this tomato fight, can reach up to 20,000, and it is a very __________ fight that lasts for a whole hour. The _______ thing is how clean Bunol is after the tomatoes are washed away after the fight. this is because the juice form tomatoes is really good for making surfaces clean!答案：1. amazing 2. wasting 3. annoying4. boring interesting taking exciting amazing
新人教版高中英語(yǔ)必修3Unit 1 Festivals and Celebrations-Reading and Thinking教學(xué)設(shè)計(jì)
The topic of this part is “Discover the reasons for festivals and celebrations.The Listening & Speaking & Talking part aims at talking about the experiences and feelings or emotions about the festivals and celebrations. This section aims at detecting the reason why the people celebrate the festivals, the time, the places, the types and the way of celebrations. It also explains why some traditions in the old celebrations are disappearing, like the firecrackers in the big cities and some new things are appearing like the prosperity of business or commerce. 1. Students can talk about what festivals they know and the reasons and the way of celebrating them.2. Students should learn the reading skills such as the headline and get the topic sentences, the structures of articles.3. Students can understand the past, the present situation of some festival around the world and why there are some changes about them. 4. Students can have the international awareness about the festivals.1. Students should learn the reading skills such as the headline and get the topic sentences, the structures of articles.2. Students can understand the past, the present situation of some festival around the world and why there are some changes about them.Step 1 Lead in---Small talkWhat festival do you like best ? Why ?I like the Spring Festivals because I can set off the fireworks, receive the lucky money and enjoy the Gala with my families.Step 2 Before reading---Pair workWhy do people celebrate different festivals ?The Spring Festivals is to celebrate the end of winter and the coming of spring and new life.The Mid-autumn Day is to celebrate the harvest and admire the moon.
新人教版高中英語(yǔ)必修3Unit 1 Festivals and Celebrations-Listening &Speaking＆Talking教學(xué)設(shè)計(jì)
The theme of this section is “Talk about festival activities and festival experiences”.Festival and holiday is a relaxing and interesting topic for students. This part talks about the topic from the daily life of students’. In the part A ---Listening and Speaking, there are three conversations among different speakers from three countries(Japan, Rio and China), where the speakers are participating in or going to participate in the festivals and celebrations. So listening for the relationship among them is a fundamental task. Actually, with the globalization and more international communication, it is normal for Chinese or foreigners to witness different festivals and celebrations in or out of China. In the Conversation 1, a foreign reporter is interviewing a Japanese young girl who just had participated in the ceremony of the Coming-of-Age Day on the street and asking her feeling about the ceremony and the afterwards activities. Conversation 2, Chinese girl Li Mei is witnessing the Rio Carnival for the first time, and her friend Carla gives her some advice on the costumes which enables her to match with the carnival to have a good time. Conversation 3, a Chinese guide is showing a group of foreign visitors around the Lantern Festival and introducing the customs of the festival to them. The three conversations have a strong vitality and insert the festival and cultural elements from different countries. So perceiving the festivals and cultures from different countries is the second task. At the same time, the scripts also insert the targeted grammar --- v-ing as attributive and predicative, which students can perceive and experience in a real context and make a road for the further study. That is the third task. In the Part B--- Listening and Talking, the theme is “Talk about festival experience”, which is the common topic in our daily conversations. During the conversation, Song Lin, a Chinese student, asked Canadian friend Max about how to spend Christmas. In the conversation, Song Lin talked about experience and the feelings during the Chinese Spring Festival, during which there are not only some enjoyable things but some unpleasant things. After the listening, perhaps students find there are some similarities between Christmas and the Chinese Spring Festival as there are some differences in the origins and celebrations. For example, people always visit friends and relatives, decorate their houses, have a big dinner together, chat and give presents to each other.
新人教版高中英語(yǔ)必修3Unit 1 Festivals and Celebrations-Reading for Writing教學(xué)設(shè)計(jì)一
The topic of this part is “Write about your festival experience”.During the Listening and Speaking and Talking, students are just asked to say out their festival experiences such as the Spring Festival, Mid-autumn Day, but this part students will be asked to write down their own festival experiences. During the reading part, it introduces the Naadam Festival in Inner Mongolia Autonomous Region, which can give students a good example to imitate. Students not only learn the festival, but touch and feel the Inner Mongolian’s character, the spirit and cultural atmosphere, which can help students form the cultural awareness and learn to enjoy and value the diversity of Chinese culture.Concretely, the dairy tells the experience that the author spent the Naadam Festival in Inner Mongolia Autonomous Region with his/her friend. The structure is clear. In the opening paragraph, it introduces the topic of the Naadam Festival and the whole feeling. Then it introduces the items of the festival like the ceremony, wrestling and horse racing. Finally, it summarizes this experience. Because this part is a travel journal, we must guide students pay more attention to these details: 1. use the first person. 2. use the past tense to tell the past thing and use the present or future tense to describe the scenery. 3. use the timeline to tell the development. 4. be careful for the author’s psychology, emotion and feeling, etc.1. Read quickly to get main idea; read carefully to get the detailed information about Naadam Festival.2. Learn the structure of the reading article and language.3. Write an article about a festival experience4. Learn to use the psychology, emotions and feeling in the writing.1. Write an article about a festival experience.2. Use the structure of the reading article and language.
新人教版高中英語(yǔ)必修3Unit 2 Morals and Virtues-Reading and Thinking教學(xué)設(shè)計(jì)
The topic of this part is “Learn to make choices in life”.The Listening & Speaking & Talking part aims at the moral dilemmas, and this part is about making choices in life. The heroin is Lin Qiaozhi, a famous medical scientist, made a great contribution to our country’s medical care. Most importantly, her life experience can inspire our students whether in studying or the development of career. she had moral dilemmas and life choices, which are similar to the students who will step into society. Besides, Lin has quite good virtues like kindness, self-improvement, insistence, job-loving , generosity and responsibility, which is worth being learned.Concretely, this article is a biography about Lin Qiaozhi. The article tells her whole life according the timeline, among which the life choices is emphasized. For example, whether married or chased her dream, returned home or stayed abroad, family or public, her choices all reflected her faith, spirit, responsibility and devotion.1. Fast reading to get the detailed information about Lin Qiaozhi; careful reading to do the deductive information.2. Learn the reading skills--deductive judgement according the context.3. Study the structure features and language features. 4. Communicate about Lin’s life choices and reflect their own life choices.1. Learn the reading skills--deductive judgement according the context.2. Study the structure features and language features.3. Communicate about Lin’s life choices and reflect their own life choices.Step 1 Lead in---Small talkWhat are some important life choices?Importance choices: university study, jobs and marriage partners. Because they can determine our future.
新人教版高中英語(yǔ)必修3Unit 2 Morals and Virtues-Reading for Writing教學(xué)設(shè)計(jì)
1. 這個(gè)寓言是一個(gè)關(guān)于一位國(guó)王古寓言。 The fable is an old fable about a king.2.作者用這個(gè)故事讓讀者對(duì)于社區(qū)的問(wèn)題負(fù)有個(gè)人責(zé)任的必要印象深刻。The author used the story to impress upon readers with the need to take personal responsibility for problems in the community.3. 這個(gè)故事十分成功的實(shí)現(xiàn)了它的目的。The story was quite successful in achieving its purpose.Step 7 WritingPlease write a review of the story according the outline above.The fable is an old fable about a king who thought his people are lazy, so he put a large stone in the middle of the road and hides and waited to see if anyone will try to move it.The author used this story to impress upon readers with the need to take personal responsibility for problems in the community. The story was quite successful in achieving its purpose, and I liked it because it had a clear moral.However, while the moral of the story is clear, the actions of the king seemed pointless to me, because none of the characters in the story learnt anything. For this reason, I think there are better stories that can be used to impress upon people with the need for personal responsibility.Step 8 Pair workExchange drafts with a partner. Use this checklist to help your partner revise his/her draft.1. Does the writer give a short description of the story ?2. Does the description include the most important details of the story ?3. Does the writer give his or her opinion about the character or their actions ?4. Is the review well-organised ? 5. Does the writer use the -ing form as the adverbial correctly in the writing ?6. Are there any grammar, spelling, or punctuation errors ?Step 9 HomeworkPut up your revised draft in the classroom or read it to your class.
新人教版高中英語(yǔ)必修3Unit 3 Diverse Cultures-Listening &Speaking＆Talking教學(xué)設(shè)計(jì)
1. In Picture 1 and Picture 2, where do you think they are from? How do you know?From their wearings, we can know they are from ethnic minority of China--- Miao and Dong.Picture 1, they are playing their traditional instrument lusheng in their traditional costumes.Picture 2. the girls are Miao because they wear their traditional costumes and silver accessory.2. In Picture 3, can you find which village it is? What time is it in the picture?It is Dong village. It is at night. Step 2 While-listeningJustin met a new friend while traveling in Guizhou. Listen to their conversation and complete the summaries below.Part 1Justin and Wu Yue watched some Miao people play the lusheng. The instrument has a history of over 3,000 years and it is even mentioned in the oldest collection of Chinese poetry. Then they watched the lusheng dance. Justin wanted to buy some hand-made silver/traditional accessories as souvenirs. He was told that the price will depend on the percentage of silver. Part 2They will go to a pretty Dong minority village called Zhaoxing. they will see the drum towers and the wind and rain bridges. They may also see a performance of the Grand Song of the Dong people.Step 3 Post-listening---TalkingWork in groups. Imagine Justin is telling some friends about his trip to Guizhou. One of you is Justin and the rest of you are his friends. Ask Justin questions about his trip and experience. The following expressions may help you.
