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初中历史与社会人教版九年级下册《地球一小时 活动》教材教案

  • 人音版小学音乐四年级上大雁湖说课稿

    人音版小学音乐四年级上大雁湖说课稿

    2、舞蹈渗透 爱的体验这个环节采用舞蹈表演化的设计,增强学生的学习兴趣。从歌曲中的节奏的练习后引出课题大雁湖,通过朗读歌词,熟悉歌曲内容,激发学生对大西北的热爱,又让学生按照歌曲的节奏读歌词,为学唱歌曲打下了基础,学生通过啦、呜、哩等声音来随琴模唱旋律。从教师表演蒙古舞蹈激发学生的学习兴趣,引出歌曲,让学生更加投入的进行歌曲学习当中来,从舞蹈表演到掌握歌曲,始终让学生在看看、听听、说说、唱唱、跳跳的轻松、愉快过程中学会歌曲。3、联系生活 爱的交流通过简单介绍自己家乡人、物、事等从而让学生获得了解家乡爱家乡共鸣。整堂课的爱家乡的教育使学生感悟体验对家乡的爱,通过爱家乡的呼唤让学生学会奉献,学会回报。此环节起到了画龙点睛升华的作用。

  • 人音版小学音乐四年级上大家来唱说课稿

    人音版小学音乐四年级上大家来唱说课稿

    (四)拓展提升唱好歌曲后,(PPT)简要介绍世界三大男高音和(PPT)欣赏意大利歌剧《桑塔?露琪亚》、《我的太阳》拓展学生的知识面。最后(PPT)再让学生说说这节课的收获,加深对本课的印象。(五)课堂小结(PPT)唱!大家来唱!你也唱,我也唱,大家来唱!我们每个人都喜欢歌唱,歌唱是幸福的,歌唱是快乐的。教师用这样的结束语进行小结,结束本课教学。六、学习评价方式(PPT)本课的学习评价方式采用自评、互评的方式进行评价。(一)自评:在学习过程中,学生对集体和自身在音乐教学活动中的表现进行评价。如:演唱歌曲时,音色是否合适。(二)互评:采用教师为主的方式进行评价。如:演唱时的声音再美一点。以上是我对本课教学的设计的阐述,谢谢您的聆听!

  • 人音版小学音乐四年级上荡秋千说课稿

    人音版小学音乐四年级上荡秋千说课稿

    第四步:表现歌曲在学生能熟练演唱歌曲的基础上,我启发学生用自己喜欢的各种方式来表现歌曲,可以律动,也可以是打击乐器,并提醒学生用打击乐器时的注意事项,这一环节,有了更大的开放性,学生也有了更多的实践和创造的机会,大大提高了学生音乐表现力和创造力。这一环节也将整堂课推向高潮。最后一个环节:拓展欣赏 深层体验完整的音乐课堂应该动静结合,在学生又唱又跳又奏热闹过后。我让学生欣赏仡佬族的特色节目《蹦蹦鼓》,使进一步了解仡佬族丰富的表演艺术,拓宽学生艺术视野,增强学生民族自豪感。最后,我简单向大家介绍下我的板书设计。本方案的设计,力求体现以人为本的思想,着眼于学生的主动发展,通过充分的音乐实践培养学生的能力,提高音乐素养。

  • 人音版小学音乐四年级上故乡是北京说课稿

    人音版小学音乐四年级上故乡是北京说课稿

    你是怎样来分的,这一环节速度怎样?通过与第一部分的比较,感受到歌词的再现,节奏的扩展,使对北京故乡的热爱之情更加的情真意切。(设计目的:通过以上的这些问题,让学生真正成为学习的主人,不仅学会,而且会学,来思考歌曲所表达的情感所在)(2介绍歌曲曲式结构 A B A’(3歌曲的演唱形式是什么?--------女声独唱,‘曲作家为什么选择女高音独唱?(设计目的:学生三、拓展师:我们的词曲作者用歌曲的形式来表达内心对故乡的热爱之情,这也正是生长于北京的人们对乡土的怀恋之情。那你们爱自己的家乡吗?喜欢家乡的什么?生:师:让我们一起走进美丽的滨海城市---慈溪,来感受慈溪的繁荣、魅力景象吧生观赏设计目的:我衷心的希望,通过这样的设计,能让“音乐”这魅力无穷而令人神往的艺术,成为孩子们心中的花朵,让他铺满孩子们的人生道路,散发出不绝的芬芳!我的说课到此结束,敬请各位评委老师多多给予指导。谢谢大家!

  • 人音版小学音乐四年级上龙里格龙说课稿

    人音版小学音乐四年级上龙里格龙说课稿

    l)、启发学生上台分别扮演“生、旦、净、丑”,各自设计适合各角色的动作,随音乐《龙里格龙》依次出场表演、造型。“净”和“丑”角可带上脸谱表演。2)、教师进行评价,请学生做票友,在精彩的地方鼓掌、喝彩。3)、全班起立,分旦角、生角加上动作表演唱《龙里格龙》。四、总结,延伸1、谈感想师:今天我们了解了京剧的一些知识,大家是不是有一点喜欢京剧了?有什么感想?请你说说。(学生自由发言。)2、介绍京剧的发展师:京剧虽然已经有两百多年的历史,但是它随着时代的进步不断地发展。现在,除了古装的传统京剧以外,还编了许多现代京剧,像著名的《红灯记》、《沙家浜》、《智取威虎山》等,但它们的唱腔并没有变。因此京剧被外国人称为东方歌剧,还有的被改编成歌曲的形式演唱,很受大家欢迎,像《唱脸谱》、《我是中国人》等,都已在祖国的大江南北传唱。在座的同学如有兴趣,可在课外多听、多看、多学,为宏扬我国传统的京剧艺术出一份力。

  • 人音版小学音乐四年级上哦,十分钟说课稿

    人音版小学音乐四年级上哦,十分钟说课稿

    同时,新课标指出“教学应体现学科综合”的理念,我将音乐与舞蹈有机结合起来,培养了学生正确的审美观,发展了学生丰富的想象力,增强了学生的创造意识和团队精神。第四个环节:课堂小结。此环节中我会指出学生学习中的问题,进一步强调2/4拍和×××后十六音符和0××带休止的切分节奏,突破重难点。同时,我会鼓励学生去课外寻找和学习跟本课的内容相关,或节奏相同的歌曲和音乐知识。教科书已不再是唯一的课程资源,课堂也不是学生获取知识的唯一途径。音乐教学的功能绝不仅仅只体现在一堂课上,我鼓励孩子们去寻找和学习课外资源,为学生的终身发展起到了推波助澜的作用。以上所述只是我对本课的一种预设,很多环节可能还需要不断的改进,在实际教学中可能还有各种问题产生,我会根据实际情况及时引导和调整。

  • 人音版小学音乐四年级上月亮月光光说课稿

    人音版小学音乐四年级上月亮月光光说课稿

    结合合作学习评价的特点,本课堂中实行多元评价,一是个人评价与小组集体评价相结合。二是重视学习过程评价与学习结果评价相结合。教师主要对学生在学习过程的态度:倾听、交流、协作情况,作评价,做得好的小组“加星换积分”,表现突出的个人“奖小圆片换积分”在课末对学生表现作统计,一个月下来,表现突出的小组被评为明星小组,并给予小礼物的肯定和鼓励。七、资源开发针对《月亮月光光》一课的教学设计,我充分的利用了课本资源、网络资源和学生自身的资源。其中在课本资源的开发利用上:在小组合作的简谱视唱环节最大限度地利用了歌谱这个课本资源。在学生自身资源的利用上:充分发挥学生的合作学习能力,放手让学生自主学习旋律。在多媒体网络资源的开发利用上,我运用多媒体,帮助学生理解,刺激学生的感官,在学生的脑海里留下深刻印象等。

  • 人音版小学音乐四年级上让我们荡起双桨说课稿

    人音版小学音乐四年级上让我们荡起双桨说课稿

    第二部分演唱歌词,首先教师同(3—5名)高声部歌唱能力强的同学配合演唱,其他同学熟悉歌词,感受情绪。其次请高、低声部能力强的同学进行示范。最后教师指挥学生进行轻声合唱并提示互相倾听。并利用计算机录音,引导学生自己从录音中发现演唱问题,及时解决。当学生能较好的演唱二声部时,引导学生随录音伴奏演唱,并用自然的体态动作,表现起伏、摇荡的感觉。体验驾着小船尽情歌唱的幸福、喜悦心情。三、完整演唱在唱好的基础上,引导学生设计多种形式演唱歌曲,充分表现完整音乐形象,创设积极自主地学习氛围,尽情表现歌曲。在这环节中,利用听录音伴奏,教师指挥完整演唱歌曲,并提示注意:在演唱过程中关注演唱声音的控制和表现,以情助声、声情并茂;师生共同创编多种形式表现歌曲(独唱、齐唱、合唱;表演唱;女生齐唱;男生齐唱)在表演中教师采用计算机录音,录制不同形式的演唱,并从声音、情绪、和声的效果三方面进行评价。最后学生起立随视频进行表演唱。教师激励评价。

  • 人音版小学音乐四年级上山童说课稿

    人音版小学音乐四年级上山童说课稿

    三、欣赏合唱歌曲《山童》1. 教师:山林里不仅有自然的声音,还有山童的歌声呢!欣赏《山童》动画。2. 提问:这首歌曲是什么演唱形式?什么情绪?歌曲有什么特点?学生回答。3. 教师总结:这首歌曲是一首具有西南地区风格音调的童声合唱,歌曲的曲调生动活泼,加入了滑音、倚音、变化音等,构成了这首歌曲特有的风格。4. 播放《山童》音频。听到合唱部分随音乐轻轻晃动身体。教师指导:指导学生感受童声合唱音色的和谐,感受歌曲自由、活泼的情绪。四、课堂小结 今天我们不仅用自己创编的声音表现了大自然的美妙,还欣赏了动听的歌曲,歌曲歌唱了色彩斑斓的大自然和富有生机的世界,希望我们大家都能够感受到大自然对我们唱出的美妙歌声。

  • 人音版小学音乐四年级上幸福拍手歌说课稿

    人音版小学音乐四年级上幸福拍手歌说课稿

    3、第三个环节:创编歌词和动作。教师问学生:除了幸福拍手,你还会做什么呢?请你做一回音乐家,创编一段,带领大家表演。(充分发挥学生的主观能动性,在创编中得到快乐)4、第四个环节:综合表演。今天大家的表现实在是很出色,但似乎还没法满足大家的创作欲望,最后我们一起跟着音乐,把你创编的歌词和动作展示一遍,(这一环节让学生充分展示自己的才艺,从创作中获得自信、获得满足。)5、第五个环节:拓展视野,介绍乐器名称,让孩子们感受乐器的声音节奏,并让孩子们用乐器给歌曲进行伴奏。充分发挥孩子们的主观能动性,主动参与到课堂创作中来。6、第六个环节:课堂小结度过了快乐的四十分钟,能告诉我你快乐吗?最后,在师生配合中结束这节课。

  • 人音版小学音乐四年级上祝你快乐说课稿

    人音版小学音乐四年级上祝你快乐说课稿

    本 课的教学过程我是这样设计的:它由通俗歌曲〈〈快乐老家〉〉导入,激起学生对音乐课的兴趣;随之进入军乐曲〈〈祝你快乐〉〉的欣赏,进一步强化学生对音乐的体验,而认识和了解军乐乐器的音色及其所表现是本节课的重点;最后学唱新歌〈〈明天会更好〉〉,同时引导学生采用各种形式表现歌曲,开发学生的创新思维;最后在快乐的歌声中结束.这样层层深入,让学生感受到音乐的魅力,从而更好地理解音乐,表现音乐.首先我请同学们听一段优美的音乐,让大家的心先沉静下来,之后播放《快乐老家》,请学生说出歌曲的名字以及这首歌曲所体现的是怎样的一种情绪?并且能够随着音乐一起律动表达对歌曲的感受,这时候我揭示课题“同学们,你们已经步入了中学时代,已经感受到了”花季”充满着快乐 充满着好奇 充满着美好的憧憬!老师愿你们的中学时代洋溢着青春的活力 青春的自豪,祝你们天天快乐!

  • 新人教版高中英语必修3Unit 1 Festivals and celebrations-Discovering Useful Structure教学设计

    新人教版高中英语必修3Unit 1 Festivals and celebrations-Discovering Useful Structure教学设计

    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动词-ing形式作表语,它通常位于系动词后面,用以说明主语“是什么”或“怎么样”一种表示主语的特质、特征和状态, 其作用相当于形容词; 另一种具体说明主语的内容, 即主语等同于表语, 两者可互换。The music they are playing sounds so exciting. 他们演奏的音乐听起来令人激动。The result is disappointing. 结果令人失望。Our job is playing all kinds of music. 我们的工作就是演奏各种音乐。Seeing is believing. 眼见为实。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

  • 新人教版高中英语必修3Unit 4 Space Exploration-Discovering Useful Structure教学设计

    新人教版高中英语必修3Unit 4 Space Exploration-Discovering Useful Structure教学设计

    The theme of the section is “Describe space facts and efforts to explore space”. Infinitives are one of non-finite verbs, as the subjects, objects, predicative, attributes and adverbials. This unit is about space exploration, which is a significant scientific activity, so every scientific activity has strong planning. Therefore, using the infinitives to show its purpose, explanations or restrictions is the best choice.1. Learn the structure, functions and features of infinitives.2. Learn to summarize some rules about infinitives to show purpose and modify.3. Learn to use infinitives in oral and writing English. 1. Learn the structure, functions and features of infinitives.2. Learn to summarize some rules about infinitives to show purpose and modify.3. Learn to use use infinitives in oral and writing English.Step 1 Lead in---Pair workLook at the following sentences and focus on the italicized infinitives. In pairs, discuss their functions. 1. I trained for a long time to fly airplanes as a fighter pilot..(作目的状语)2. As we all know, an astronaut needs to be healthy and calm in order to work in space..(作目的状语)3. First of all, you must be intelligent enough to get a related college degree..(作目的状语)4. Some scientist were determined to help humans realise their dream to explore space..(作定语)5. On 12 April 1961, Yuri Gagarin became the first person in the world to go into space..(作定语)Summary:1. 不定式的结构:to+do原形。2. 分析上面的句子,我们知道在描述太空探索时,动词不定式不仅可以用来表目的,还可以用来作定语,表修饰。

  • 新人教版高中英语必修3Unit 4 Space Exploration-Reading for Writing教学设计二

    新人教版高中英语必修3Unit 4 Space Exploration-Reading for Writing教学设计二

    ⑦在我看来, 探索太空是值得的。As far as I am concerned, it is worthwhile to explore the space.Step 10 Writing---draftRecently, students in our class have had heated a discussion on whether space is worth exploring. Students hold different ideas about it.30% of us think space exploration is not worthwhile. They think space is too far away from us and our daily life and is a waste of money. And the money spent on space exploration can be used to solve the earth’s problems such as starvation and pollution.On the other hand,70% think space is worth exploring because we have benefited a lot from it,such as using satellites for communication and weather forecast. What’s more,with further space research,we may solve the population problem by moving to other planets one day. Also,space research will enable us to find new sources to solve the problem of energy shortages on the earth.As far as I am concerned, it is worthwhile to explore the space. Not only can it promote the development of society but also enrich our life. Step 11 Pair workExchange drafts with a partner. Use this checklist to help your partner revise his/her draft.1.Does the writer explain why he/she changed/wanted to change?2.Does the writer tell how the changes have improved or will improve his/her life?3.Is the text well-organised?4.Does the writer use words and expressions to show similarities and differences?5.Are there any grammar or spelling errors?6.Does the writer use correct punctuation?

  • 新人教版高中英语必修3Unit 5 The Value of Money- Discovering Useful Structure教学设计

    新人教版高中英语必修3Unit 5 The Value of Money- Discovering Useful Structure教学设计

    Step 3 Meaning1. 过去将来时表示从过去某一时间来看将要发生的动作或存在的状态, 常用在宾语从句中。一般由“would/should +动词原形”构成。She hoped that they would meet again someday. 她希望将来有一天他们能再见面。2. was/were going to+动词原形: 表示过去将要发生或很有可能发生的动作, 常用于口语中, 表示预言、意图或者打算等。He was going to start work the following week. 他打算下星期开始工作。3. was/were about to do: 常用来表示即将发生的动作, “刚要/正要做……”。注意该结构不与任何时间状语连用。I felt that something terrible was about to happen. 我感到某种可怕的事情即将发生。4.was/were to do: 表示“曾计划做某事”, 如果表示“本来计划做某事, 动作没实现”, 则需用 “was/were to have done”。She said she was to have told me about the accident. 她说她本来想告诉我关于事故的事。5.Start, go, come, leave, see, meet等动词的过去进行时: 表示就过去某一时刻而言即将发生的动作。She was coming later. 她随后就来。I had just put on my overcoat and was leaving to visit a friend of mine. 我刚穿上外套要去看我的一个朋友。

  • 新人教版高中英语选修2Unit 4 Journey Across a Vast Land教学设计

    新人教版高中英语选修2Unit 4 Journey Across a Vast Land教学设计

    当孩子们由父母陪同时,他们才被允许进入这个运动场。3.过去分词(短语)作状语时的几种特殊情况(1)过去分词(短语)在句中作时间、条件、原因、让步状语时,相当于对应的时间、条件、原因及让步状语从句。Seen from the top of the mountain (=When it is seen from the top of the mountain), the whole town looks more beautiful.从山顶上看,整个城市看起来更美了。Given ten more minutes (=If we are given ten more minutes), we will finish the work perfectly.如果多给十分钟,我们会完美地完成这项工作。Greatly touched by his words (=Because she was greatly touched by his words), she was full of tears.由于被他的话深深地感动,她满眼泪花。Warned of the storm (=Though they were warned of the storm), the farmers were still working on the farm.尽管被警告了风暴的到来,但农民们仍在农场干活。(2)过去分词(短语)在句中作伴随、方式等状语时,可改为句子的并列谓语或改为并列分句。The teacher came into the room, followed by two students (=and was followed by two students).后面跟着两个学生,老师走进了房间。He spent the whole afternoon, accompanied by his mom(=and was accompanied by his mom).他由母亲陪着度过了一整个下午。

  • 新人教版高中英语选修2Unit 1 Science and Scientists-Reading and thinking教学设计

    新人教版高中英语选修2Unit 1 Science and Scientists-Reading and thinking教学设计

    Step 5: After learning the text, discuss with your peers about the following questions:1.John Snow believed Idea 2 was right. How did he finally prove it?2. Do you think John Snow would have solved this problem without the map?3. Cholera is a 19th century disease. What disease do you think is similar to cholera today?SARS and Covid-19 because they are both deadly and fatally infectious, have an unknown cause and need serious public health care to solve them urgently.keys:1. John Snow finally proved his idea because he found an outbreak that was clearly related to cholera, collected information and was able to tie cases outside the area to the polluted water.2. No. The map helped John Snow organize his ideas. He was able to identify those households that had had many deaths and check their water-drinking habits. He identified those houses that had had no deaths and surveyed their drinking habits. The evidence clearly pointed to the polluted water being the cause.3. SARS and Covid-19 because they are both deadly and fatally infectious, have an unknown cause and need serious public health care to solve them urgently.Step 6: Consolidate what you have learned by filling in the blanks:John Snow was a well-known _1___ in London in the _2__ century. He wanted to find the _3_____ of cholera in order to help people ___4_____ it. In 1854 when a cholera __5__ London, he began to gather information. He ___6__ on a map ___7___ all the dead people had lived and he found that many people who had ___8____ (drink) the dirty water from the __9____ died. So he decided that the polluted water ___10____ cholera. He suggested that the ___11__ of all water supplies should be _12______ and new methods of dealing with ____13___ water be found. Finally, “King Cholera” was __14_____.Keys: 1. doctor 2. 19th 3.cause 4.infected with 5.hit 6.marked 7.where 8.drunk 9.pump 10.carried 11.source 12.examined 13.polluted 14.defeatedHomework: Retell the text after class and preview its language points

  • 新人教版高中英语选修2Unit 2 Bridging Cultures-Discovering useful structures教学设计

    新人教版高中英语选修2Unit 2 Bridging Cultures-Discovering useful structures教学设计

    The grammar of this unit is designed to review noun clauses. Sentences that use nouns in a sentence are called noun clauses. Nominal clauses can act as subject, object, predicate, appositive and other components in compound sentences. According to the above-mentioned different grammatical functions, nominal clauses are divided into subject clause, object clause, predicate clause and appositive clause. In this unit, we will review the three kinds of nominal clauses. Appositive clauses are not required to be mastered in the optional compulsory stage, so they are not involved.1. Guide the students to judge the compound sentences and determine the composition of the clauses in the sentence.2. Instruct students to try to learn grammar by generalizing grammar rules, controlling written practice, and semi-open oral output.3. Inspire the students to systematize the function and usage of noun clause1.Instruct students to try to learn grammar by generalizing grammar rules, controlling written practice, and semi-open oral output.2.Inspire the students to systematize the function and usage of noun clauseStep1: The teacher ask studetns to find out more nominal clauses from the reading passage and udnerline the nominal clauses.

  • 人教版高中数学选择性必修二等差数列的前n项和公式(1)教学设计

    人教版高中数学选择性必修二等差数列的前n项和公式(1)教学设计

    高斯(Gauss,1777-1855),德国数学家,近代数学的奠基者之一. 他在天文学、大地测量学、磁学、光学等领域都做出过杰出贡献. 问题1:为什么1+100=2+99=…=50+51呢?这是巧合吗?试从数列角度给出解释.高斯的算法:(1+100)+(2+99)+…+(50+51)= 101×50=5050高斯的算法实际上解决了求等差数列:1,2,3,…,n,"… " 前100项的和问题.等差数列中,下标和相等的两项和相等.设 an=n,则 a1=1,a2=2,a3=3,…如果数列{an} 是等差数列,p,q,s,t∈N*,且 p+q=s+t,则 ap+aq=as+at 可得:a_1+a_100=a_2+a_99=?=a_50+a_51问题2: 你能用上述方法计算1+2+3+… +101吗?问题3: 你能计算1+2+3+… +n吗?需要对项数的奇偶进行分类讨论.当n为偶数时, S_n=(1+n)+[(2+(n-1)]+?+[(n/2+(n/2-1)]=(1+n)+(1+n)…+(1+n)=n/2 (1+n) =(n(1+n))/2当n为奇数数时, n-1为偶数

  • 人教版高中数学选择性必修二导数的四则运算法则教学设计

    人教版高中数学选择性必修二导数的四则运算法则教学设计

    求函数的导数的策略(1)先区分函数的运算特点,即函数的和、差、积、商,再根据导数的运算法则求导数;(2)对于三个以上函数的积、商的导数,依次转化为“两个”函数的积、商的导数计算.跟踪训练1 求下列函数的导数:(1)y=x2+log3x; (2)y=x3·ex; (3)y=cos xx.[解] (1)y′=(x2+log3x)′=(x2)′+(log3x)′=2x+1xln 3.(2)y′=(x3·ex)′=(x3)′·ex+x3·(ex)′=3x2·ex+x3·ex=ex(x3+3x2).(3)y′=cos xx′=?cos x?′·x-cos x·?x?′x2=-x·sin x-cos xx2=-xsin x+cos xx2.跟踪训练2 求下列函数的导数(1)y=tan x; (2)y=2sin x2cos x2解析:(1)y=tan x=sin xcos x,故y′=?sin x?′cos x-?cos x?′sin x?cos x?2=cos2x+sin2xcos2x=1cos2x.(2)y=2sin x2cos x2=sin x,故y′=cos x.例5 日常生活中的饮用水通常是经过净化的,随着水的纯净度的提高,所需进化费用不断增加,已知将1t水进化到纯净度为x%所需费用(单位:元),为c(x)=5284/(100-x) (80<x<100)求进化到下列纯净度时,所需进化费用的瞬时变化率:(1) 90% ;(2) 98%解:净化费用的瞬时变化率就是净化费用函数的导数;c^' (x)=〖(5284/(100-x))〗^'=(5284^’×(100-x)-"5284 " 〖(100-x)〗^’)/〖(100-x)〗^2 =(0×(100-x)-"5284 " ×(-1))/〖(100-x)〗^2 ="5284 " /〖(100-x)〗^2

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