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新人教版高中英語選修2Unit 2 Bridging Cultures-Discovering useful structures教學(xué)設(shè)計
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.
新人教版高中英語選修2Unit 5 First Aid-Discovering useful structures教學(xué)設(shè)計
You have no excuse for not going.你沒有理由不去。He was punished for not having finished his homework.他因未完成作業(yè)而受到懲罰。2．動詞ing形式復(fù)合結(jié)構(gòu)由物主代詞或人稱代詞賓格、名詞所有格或普通格加動詞ing，即“sb./sb.'s＋doing”構(gòu)成。動詞ing形式的復(fù)合結(jié)構(gòu)實際上是給動詞ing形式加了一個邏輯主語。動詞ing形式的復(fù)合結(jié)構(gòu)有四種形式：①形容詞性物主代詞＋動詞ing②名詞所有格＋動詞ing③代詞賓格＋動詞ing④名詞＋動詞ingHer coming to help encouraged all of us.她來幫忙鼓舞了我們所有人。The baby was made awake by the door suddenly shutting.這個嬰兒被突然的關(guān)門聲吵醒了。Can you imagine him/Jack cooking at home?你能想象他/杰克在家做飯的樣子嗎？無生命名詞無論是作主語還是作賓語都不能用第②種形式。Tom's winning first prize last year impressed me a lot.湯姆去年得了一等獎使我印象深刻。Do you mind my/me/Jack's/Jack leaving now?你介意我/杰克現(xiàn)在離開嗎？Excuse me for my not coming on time．很抱歉我沒能按時來。His father's being ill made him worried.他父親病了，他很擔(dān)心。We are looking forward to the singer's/the singer to give us a concert.我們盼望著這位歌手來給我們舉辦一場演唱會。
新人教版高中英語選修2Unit 1 Science and Scientists-Discovering useful structures教學(xué)設(shè)計
The grammatical structure of this unit is predicative clause. Like object clause and subject clause, predicative clause is one of Nominal Clauses. The leading words of predicative clauses are that, what, how, what, where, as if, because, etc.The design of teaching activities aims to guide students to perceive the structural features of predicative clauses and think about their ideographic functions. Beyond that, students should be guided to use this grammar in the context apporpriately and flexibly.1. Enable the Ss to master the usage of the predicative clauses in this unit.2. Enable the Ss to use the predicative patterns flexibly.3. Train the Ss to apply some skills by doing the relevant exercises.1.Guide students to perceive the structural features of predicative clauses and think about their ideographic functions.2.Strengthen students' ability of using predicative clauses in context, but also cultivate their ability of text analysis and logical reasoning competence.Step1: Underline all the examples in the reading passage, where noun clauses are used as the predicative. Then state their meaning and functions.1) One theory was that bad air caused the disease.2) Another theory was that cholera was caused by an infection from germs in food or water.3) The truth was that the water from the Broad Street had been infected by waste.Sum up the rules of grammar:1. 以上黑體部分在句中作表語。2. 句1、2、3中的that在從句中不作成分，只起連接作用。 Step2: Review the basic components of predicative clauses1.Definition
新人教版高中英語選修2Unit 1 Science and Scientists-Learning about Language教學(xué)設(shè)計
Step 7: complete the discourse according to the grammar rules.Cholera used to be one of the most 1.__________ (fear) diseases in the world. In the early 19th century, _2_________ an outbreak of cholera hit Europe, millions of people died. But neither its cause, 3__________ its cure was understood. A British doctor, John Snow, wanted to solve the problem and he knew that cholera would not be controlled _4_________ its cause was found. In general, there were two contradictory theories 5 __________ explained how cholera spread. The first suggested that bad air caused the disease. The second was that cholera was caused by an _6_________(infect) from germs in food or water. John Snow thought that the second theory was correct but he needed proof. So when another outbreak of cholera hit London in 1854, he began to investigate. Later, with all the evidence he _7_________ (gather), John Snow was able to announce that the pump water carried cholera germs. Therefore, he had the handle of the pump _8_________ (remove) so that it couldn't be used. Through his intervention，the disease was stopped in its tracks. What is more, John Snow found that some companies sold water from the River Thames that __9__________________ (pollute) by raw waste. The people who drank this water were much more likely _10_________ (get) cholera than those who drank pure or boiled water. Through John Snow's efforts, the _11_________ (threaten) of cholera around the world saw a substantial increase. Keys： 1.feared 2.when 3. nor 4.unless 5.that/which 6.infection 7.had gathered 8.removed 9.was polluted 10.to get 11. threat
新人教版高中英語選修2Unit 1 Science and Scientists-Using langauge教學(xué)設(shè)計
This happens because the dish soap molecules have a strong negative charge, and the milk molecules have a strong positive charge. Like magnets, these molecules are attracted to each other, and so they appear to move around on the plate, taking the food coloring with them, making it look like the colors are quickly moving to escape from the soap.Listening text:? Judy: Oh, I'm so sorry that you were ill and couldn't come with us on our field trip. How are you feeling now? Better?? Bill: Much better, thanks. But how was it?? Judy: Wonderful! I especially liked an area of the museum called Light Games.it was really cool. They had a hall of mirrors where I could see myself reflected thousands of times!? Bill: A hall of mirrors can be a lot of fun. What else did they have?? Judy: Well, they had an experiment where we looked at a blue screen for a while, and then suddenly we could see tiny bright lights moving around on it. You'll never guess what those bright lights were!? Bill: Come on, tell me!? Judy: They were our own blood cells. For some reason, our eyes play tricks on us when we look at a blue screen, and we can see our own blood cells moving around like little lights! But there was another thing I liked better. I stood in front of a white light, and it cast different shadows of me in every color of the rainbow!? Bill: Oh, I wish I had been there. Tell me more!? Judy: Well, they had another area for sound. They had a giant piano keyboard that you could use your feet to play. But then, instead of playing the sounds of a piano, it played the voices of classical singers! Then they had a giant dish, and when you spoke into it, it reflected the sound back and made it louder. You could use it to speak in a whisper to someone 17 meters away.? Bill: It all sounds so cool. I wish I could have gone with you? Judy: I know, but we can go together this weekend. I'd love to go there again!? Bill: That sounds like a great idea!
新人教版高中英語必修2Unit 3 The Internet-Reading and Thinking教案二
Q5：What's Jan's next goal?Her next goal is to start a charity website to raise money for children in poor countries.Q6：What can we learn from her experiences?We learn that when we go through tough times, we can find help and support from other people online. We learn that we can feel less lonelyStep 5: While reading---rethinkingQ1: What is Jan’s attitude to the Internet ?Thankful/Grateful, because it has changed her and her life.Q2: What writing skills is used in the article ?Examples(Jan’s example, the 59-year-old man’s and the 61-year-old woman’s example)Q3: Can you get the main idea of the article ?The Internet has changed Jan’s life/Jan’s life has been changed by the Internet.Step 6 Post reading---Retell the storyMuch has been written about the wonders of the World Wide Web. There are countless articles (1)telling(tell) us how the Internet has made our lives more convenient. But the Internet has done a lot (2)more(much) for people than simply make life more convenient. People’s lives (3) have been changed(change) by online communities and social networks so far. Take Jan for example, who developed a serious illness that made her (4)stuck(stick) at home with only her computer to keep (5)her(she) company. She joined an online group (6)where she could share problems, support and advice with others. She considered the ability to remove the distance between people as one of the greatest (7)benefits(benefit). She was so inspired (8)that she started an IT club in which many people have been helped. She has started to learn more about how to use the Internet to make society better. Her next goal is to start a charity website to raise money (9)for children in poor countries. Jan’s life has been (10)greatly(great) improved by the Internet.
高中數(shù)學(xué)人教版必修二直線的點斜式方程教案
【教學(xué)目標(biāo)】知識目標(biāo)：理解直線的點斜式方程、斜截式方程、橫截距、縱截距的概念；掌握直線的點斜式方程、斜截式方程的確定．能力目標(biāo)：通過求解直線的點斜式方程和斜截式方程，培養(yǎng)學(xué)生的數(shù)學(xué)思維能力與數(shù)形結(jié)合的數(shù)學(xué)思想．情感目標(biāo)：通過學(xué)習(xí)直線的點斜式方程和斜截式方程，體會數(shù)形結(jié)合的直觀感受．【教學(xué)重點】直線的點斜式方程、斜截式方程的確定．【教學(xué)難點】直線的點斜式方程、斜截式方程的確定．
高中數(shù)學(xué)人教版必修二直線的點斜式方程教案
【教學(xué)重點】直線的點斜式方程、斜截式方程的確定．【教學(xué)難點】直線的點斜式方程、斜截式方程的確定．【教學(xué)過程】1、對特殊三角函數(shù)進行鞏固復(fù)習(xí)；表1 內(nèi)特殊三角函數(shù)值 不存在圖1 特殊三角形2、鞏固復(fù)習(xí)直線的傾斜角和斜率相關(guān)內(nèi)容；直線的傾斜角：，；直線的斜率： ， ；設(shè)點為直線l上的任意兩點，當(dāng)時，
人教A版高中數(shù)學(xué)必修一充分條件與必要條件教學(xué)設(shè)計（2）
【例3】本例中“p是q的充分不必要條件”改為“p是q的必要不充分條件”，其他條件不變，試求m的取值范圍．【答案】見解析【解析】由x2－8x－20≤0得－2≤x≤10，由x2－2x＋1－m2≤0(m>0)得1－m≤x≤1＋m(m>0)因為p是q的必要不充分條件，所以q?p，且p?/q.則{x|1－m≤x≤1＋m，m>0}?{x|－2≤x≤10}所以m>01－m≥－21＋m≤10，解得0<m≤3.即m的取值范圍是(0,3]．解題技巧：（利用充分、必要、充分必要條件的關(guān)系求參數(shù)范圍）(1)化簡p、q兩命題，(2)根據(jù)p與q的關(guān)系(充分、必要、充要條件)轉(zhuǎn)化為集合間的關(guān)系，(3)利用集合間的關(guān)系建立不等關(guān)系，(4)求解參數(shù)范圍．跟蹤訓(xùn)練三3．已知P＝{x|a－4<x<a＋4}，Q＝{x|1<x<3}，“x∈P”是“x∈Q”的必要條件，求實數(shù)a的取值范圍．【答案】見解析【解析】因為“x∈P”是x∈Q的必要條件，所以Q?P.所以a－4≤1a＋4≥3解得－1≤a≤5即a的取值范圍是[－1,5]．五、課堂小結(jié)讓學(xué)生總結(jié)本節(jié)課所學(xué)主要知識及解題技巧
人教A版高中數(shù)學(xué)必修一充分條件與必要條件教學(xué)設(shè)計（1）
本課是高中數(shù)學(xué)第一章第4節(jié)，充要條件是中學(xué)數(shù)學(xué)中最重要的數(shù)學(xué)概念之一， 它主要討論了命題的條件與結(jié)論之間的邏輯關(guān)系,目的是為今后的數(shù)學(xué)學(xué)習(xí)特別是數(shù)學(xué)推理的學(xué)習(xí)打下基礎(chǔ)。從學(xué)生學(xué)習(xí)的角度看，與舊教材相比，教學(xué)時間的前置，造成學(xué)生在學(xué)習(xí)充要條件這一概念時的知識儲備不夠豐富，邏輯思維能力的訓(xùn)練不夠充分，這也為教師的教學(xué)帶來一定的困難．“充要條件”這一節(jié)介紹了充分條件,必要條件和充要條件三個概念,由于這些概念比較抽象,中學(xué)生不易理解,用它們?nèi)ソ鉀Q具體問題則更為困難,因此”充要條件”的教學(xué)成為中學(xué)數(shù)學(xué)的難點之一,而必要條件的定義又是本節(jié)內(nèi)容的難點.A.正確理解充分不必要條件、必要不充分條件、充要條件的概念；B.會判斷命題的充分條件、必要條件、充要條件．C.通過學(xué)習(xí)，使學(xué)生明白對條件的判定應(yīng)該歸結(jié)為判斷命題的真假.D.在觀察和思考中，在解題和證明題中，培養(yǎng)學(xué)生思維能力的嚴(yán)密性品質(zhì)．
人教A版高中數(shù)學(xué)必修一三角函數(shù)的應(yīng)用教學(xué)設(shè)計（2）
本節(jié)課是在學(xué)習(xí)了三角函數(shù)圖象和性質(zhì)的前提下來學(xué)習(xí)三角函數(shù)模型的簡單應(yīng)用，進一步突出函數(shù)來源于生活應(yīng)用于生活的思想，讓學(xué)生體驗一些具有周期性變化規(guī)律的實際問題的數(shù)學(xué)“建?！彼枷?從而培養(yǎng)學(xué)生的創(chuàng)新精神和實踐能力.課程目標(biāo)1.了解三角函數(shù)是描述周期變化現(xiàn)象的重要函數(shù)模型，并會用三角函數(shù)模型解決一些簡單的實際問題．2．實際問題抽象為三角函數(shù)模型． 數(shù)學(xué)學(xué)科素養(yǎng)1.邏輯抽象：實際問題抽象為三角函數(shù)模型問題；2.數(shù)據(jù)分析：分析、整理、利用信息，從實際問題中抽取基本的數(shù)學(xué)關(guān)系來建立數(shù)學(xué)模型； 3.數(shù)學(xué)運算：實際問題求解； 4.數(shù)學(xué)建模：體驗一些具有周期性變化規(guī)律的實際問題的數(shù)學(xué)建模思想，提高學(xué)生的建模、分析問題、數(shù)形結(jié)合、抽象概括等能力.
人教A版高中數(shù)學(xué)必修一等式性質(zhì)與不等式性質(zhì)教學(xué)設(shè)計（2）
等式性質(zhì)與不等式性質(zhì)是高中數(shù)學(xué)的主要內(nèi)容之一，在高中數(shù)學(xué)中占有重要地位，它是刻畫現(xiàn)實世界中量與量之間關(guān)系的有效數(shù)學(xué)模型，在現(xiàn)實生活中有著廣泛的應(yīng)，有著重要的實際意義.同時等式性質(zhì)與不等式性質(zhì)也為學(xué)生以后順利學(xué)習(xí)基本不等式起到重要的鋪墊.課程目標(biāo)1. 掌握等式性質(zhì)與不等式性質(zhì)以及推論，能夠運用其解決簡單的問題．2. 進一步掌握作差、作商、綜合法等比較法比較實數(shù)的大?。?3. 通過教學(xué)培養(yǎng)學(xué)生合作交流的意識和大膽猜測、樂于探究的良好思維品質(zhì)。數(shù)學(xué)學(xué)科素養(yǎng)1.數(shù)學(xué)抽象：不等式的基本性質(zhì)；2.邏輯推理：不等式的證明；3.數(shù)學(xué)運算：比較多項式的大小及重要不等式的應(yīng)用；4.數(shù)據(jù)分析：多項式的取值范圍，許將單項式的范圍之一求出，然后相加或相乘.（將減法轉(zhuǎn)化為加法，將除法轉(zhuǎn)化為乘法）；5.數(shù)學(xué)建模：運用類比的思想有等式的基本性質(zhì)猜測不等式的基本性質(zhì)。
人教A版高中數(shù)學(xué)必修一函數(shù)的零點與方程的解教學(xué)設(shè)計（1）
本節(jié)課是新版教材人教A版普通高中課程標(biāo)準(zhǔn)實驗教科書數(shù)學(xué)必修1第四章第4.5.1節(jié)《函數(shù)零點與方程的解》，由于學(xué)生已經(jīng)學(xué)過一元二次方程與二次函數(shù)的關(guān)系，本節(jié)課的內(nèi)容就是在此基礎(chǔ)上的推廣。從而建立一般的函數(shù)的零點概念，進一步理解零點判定定理及其應(yīng)用。培養(yǎng)和發(fā)展學(xué)生數(shù)學(xué)直觀、數(shù)學(xué)抽象、邏輯推理和數(shù)學(xué)建模的核心素養(yǎng)。1、了解函數(shù)（結(jié)合二次函數(shù)）零點的概念；2、理 解函數(shù)零點與方程的根以及函數(shù)圖象與x軸交點的關(guān)系,掌握零點存在性定理的運用；3、在認(rèn)識函數(shù)零點的過程中，使學(xué)生學(xué)會認(rèn)識事物的特殊性與一般性之間的關(guān)系，培養(yǎng)數(shù)學(xué)數(shù)形結(jié)合及函數(shù)思想； a.數(shù)學(xué)抽象：函數(shù)零點的概念；b.邏輯推理：零點判定定理；c.數(shù)學(xué)運算：運用零點判定定理確定零點范圍；d.直觀想象：運用圖形判定零點；e.數(shù)學(xué)建模：運用函數(shù)的觀點方程的根；
人教A版高中數(shù)學(xué)必修一函數(shù)的零點與方程的解教學(xué)設(shè)計（2）
本章通過學(xué)習(xí)用二分法求方程近似解的的方法，使學(xué)生體會函數(shù)與方程之間的關(guān)系，通過一些函數(shù)模型的實例，讓學(xué)生感受建立函數(shù)模型的過程和方法，體會函數(shù)在數(shù)學(xué)和其他學(xué)科中的廣泛應(yīng)用，進一步認(rèn)識到函數(shù)是描述客觀世界變化規(guī)律的基本數(shù)學(xué)模型，能初步運用函數(shù)思想解決一些生活中的簡單問題。1.了解函數(shù)的零點、方程的根與圖象交點三者之間的聯(lián)系.2.會借助零點存在性定理判斷函數(shù)的零點所在的大致區(qū)間.3.能借助函數(shù)單調(diào)性及圖象判斷零點個數(shù)．?dāng)?shù)學(xué)學(xué)科素養(yǎng)1.數(shù)學(xué)抽象：函數(shù)零點的概念；2.邏輯推理：借助圖像判斷零點個數(shù)；3.數(shù)學(xué)運算：求函數(shù)零點或零點所在區(qū)間；4.數(shù)學(xué)建模：通過由抽象到具體，由具體到一般的思想總結(jié)函數(shù)零點概念.重點：零點的概念，及零點與方程根的聯(lián)系；難點：零點的概念的形成．
人教A版高中數(shù)學(xué)必修一集合的基本運算教學(xué)設(shè)計（1）
本節(jié)是新人教A版高中數(shù)學(xué)必修1第1章第1節(jié)第3部分的內(nèi)容。在此之前,學(xué)生已學(xué)習(xí)了集合的含義以及集合與集合之間的基本關(guān)系,這為學(xué)習(xí)本節(jié)內(nèi)容打下了基礎(chǔ)。本節(jié)內(nèi)容主要介紹集合的基本運算一并集、交集、補集。是對集合基木知識的深入研究。在此,通過適當(dāng)?shù)膯栴}情境,使學(xué)生感受、認(rèn)識并掌握集合的三種基本運算。本節(jié)內(nèi)容是函數(shù)、方程、不等式的基礎(chǔ)，在教材中起著承上啟下的作用。本節(jié)內(nèi)容是高中數(shù)學(xué)的主要內(nèi)容，也是高考的對象，在實踐中應(yīng)用廣泛，是高中學(xué)生必須掌握的重點。A.理解兩個集合的并集與交集的含義，會求簡單集合的交、并運算；B.理解補集的含義，會求給定子集的補集；C.能使用 圖表示集合的關(guān)系及運算。 1.數(shù)學(xué)抽象：集合交集、并集、補集的含義；2.數(shù)學(xué)運算：集合的運算；3.直觀想象：用 圖、數(shù)軸表示集合的關(guān)系及運算。
人教A版高中數(shù)學(xué)必修一集合的基本運算教學(xué)設(shè)計（2）
集合的基本運算是人教版普通高中課程標(biāo)準(zhǔn)實驗教科書，數(shù)學(xué)必修1第一章第三節(jié)的內(nèi)容. 在此之前，學(xué)生已學(xué)習(xí)了集合的含義以及集合與集合之間的基本關(guān)系，這為學(xué)習(xí)本節(jié)內(nèi)容打下了基礎(chǔ). 本節(jié)內(nèi)容是函數(shù)、方程、不等式的基礎(chǔ)，在教材中起著承上啟下的作用. 本節(jié)內(nèi)容是高中數(shù)學(xué)的主要內(nèi)容，也是高考的對象，在實踐中應(yīng)用廣泛，是高中學(xué)生必須掌握的重點.課程目標(biāo)1. 理解兩個集合的并集與交集的含義，能求兩個集合的并集與交集；2. 理解全集和補集的含義，能求給定集合的補集； 3. 能使用Venn圖表達集合的基本關(guān)系與基本運算.數(shù)學(xué)學(xué)科素養(yǎng)1.數(shù)學(xué)抽象：并集、交集、全集、補集含義的理解；2.邏輯推理：并集、交集及補集的性質(zhì)的推導(dǎo)；3.數(shù)學(xué)運算：求 兩個集合的并集、交集及補集，已知并集、交集及補集的性質(zhì)求參數(shù)（參數(shù)的范圍）；4.數(shù)據(jù)分析：通過并集、交集及補集的性質(zhì)列不等式組，此過程中重點關(guān)注端點是否含“=”及?問題；
人教A版高中數(shù)學(xué)必修一集合間的基本關(guān)系教學(xué)設(shè)計（2）
第一節(jié)通過研究集合中元素的特點研究了元素與集合之間的關(guān)系及集合的表示方法，而本節(jié)重點通過研究元素得到兩個集合之間的關(guān)系，尤其學(xué)生學(xué)完兩個集合之間的關(guān)系后，一定讓學(xué)生明確元素與集合、集合與集合之間的區(qū)別。課程目標(biāo)1. 了解集合之間包含與相等的含義，能識別給定集合的子集．2. 理解子集.真子集的概念． 3. 能使用 圖表達集合間的關(guān)系，體會直觀圖示對理解抽象概念的作用。數(shù)學(xué)學(xué)科素養(yǎng)1.數(shù)學(xué)抽象：子集和空集含義的理解；2.邏輯推理：子集、真子集、空集之間的聯(lián)系與區(qū)別；3.數(shù)學(xué)運算：由集合間的關(guān)系求參數(shù)的范圍，常見包含一元二次方程及其不等式和不等式組；4.數(shù)據(jù)分析：通過集合關(guān)系列不等式組， 此過程中重點關(guān)注端點是否含“=”及 問題；5.數(shù)學(xué)建模：用集合思想對實際生活中的對象進行判斷與歸類。
人教A版高中數(shù)學(xué)必修一簡單的三角恒等變換教學(xué)設(shè)計（2）
它位于三角函數(shù)與數(shù)學(xué)變換的結(jié)合點上，能較好反應(yīng)三角函數(shù)及變換之間的內(nèi)在聯(lián)系和相互轉(zhuǎn)換，本節(jié)課內(nèi)容的地位體現(xiàn)在它的基礎(chǔ)性上。作用體現(xiàn)在它的工具性上。前面學(xué)生已經(jīng)掌握了兩角和與差的正弦、余弦、正切公式以及二倍角公式，并能通過這些公式進行求值、化簡、證明，雖然學(xué)生已經(jīng)具備了一定的推理、運算能力，但在數(shù)學(xué)的應(yīng)用意識與應(yīng)用能力方面尚需進一步培養(yǎng).課程目標(biāo)1.能用二倍角公式推導(dǎo)出半角公式，體會三角恒等變換的基本思想方法，以及進行簡單的應(yīng)用． 2.了解三角恒等變換的特點、變換技巧，掌握三角恒等變換的基本思想方法． 3.能利用三角恒等變換的技巧進行三角函數(shù)式的化簡、求值以及證明，進而進行簡單的應(yīng)用． 數(shù)學(xué)學(xué)科素養(yǎng)1.邏輯推理： 三角恒等式的證明； 2.數(shù)據(jù)分析：三角函數(shù)式的化簡； 3.數(shù)學(xué)運算：三角函數(shù)式的求值.
人教A版高中數(shù)學(xué)必修一全稱量詞與存在量詞教學(xué)設(shè)計（2）
(4)“不論m取何實數(shù),方程x2+2x-m=0都有實數(shù)根”是全稱量詞命題,其否定為“存在實數(shù)m0,使得方程x2+2x-m0=0沒有實數(shù)根”,它是真命題.解題技巧：（含有一個量詞的命題的否定方法）(1)一般地,寫含有一個量詞的命題的否定,首先要明確這個命題是全稱量詞命題還是存在量詞命題,并找到其量詞的位置及相應(yīng)結(jié)論,然后把命題中的全稱量詞改成存在量詞,存在量詞改成全稱量詞,同時否定結(jié)論.(2)對于省略量詞的命題,應(yīng)先挖掘命題中隱含的量詞,改寫成含量詞的完整形式,再依據(jù)規(guī)則來寫出命題的否定.跟蹤訓(xùn)練三3．寫出下列命題的否定,并判斷其真假:(1)p:?x∈R,x2-x+ ≥0;(2)q:所有的正方形都是矩形;(3)r:?x∈R,x2+3x+7≤0;(4)s:至少有一個實數(shù)x,使x3+1=0.【答案】見解析【解析】(1) p:?x∈R,x2-x+1/4<0.∵?x∈R,x2-x+1/4=(x"-" 1/2)^2≥0恒成立,∴ p是假命題.
人教A版高中數(shù)學(xué)必修一同角三角函數(shù)的基本關(guān)系教學(xué)設(shè)計（2）
本節(jié)內(nèi)容是學(xué)生學(xué)習(xí)了任意角和弧度制，任意角的三角函數(shù)后，安排的一節(jié)繼續(xù)深入學(xué)習(xí)內(nèi)容，是求三角函數(shù)值、化簡三角函數(shù)式、證明三角恒等式的基本工具，是整個三角函數(shù)知識的基礎(chǔ)，在教材中起承上啟下的作用。同時，它體現(xiàn)的數(shù)學(xué)思想與方法在整個中學(xué)數(shù)學(xué)學(xué)習(xí)中起重要作用。課程目標(biāo)1.理解并掌握同角三角函數(shù)基本關(guān)系式的推導(dǎo)及應(yīng)用．2.會利用同角三角函數(shù)的基本關(guān)系式進行化簡、求值與恒等式證明．?dāng)?shù)學(xué)學(xué)科素養(yǎng)1.數(shù)學(xué)抽象：理解同角三角函數(shù)基本關(guān)系式；2.邏輯推理： “sin α±cos α”同“sin αcos α”間的關(guān)系；3.數(shù)學(xué)運算：利用同角三角函數(shù)的基本關(guān)系式進行化簡、求值與恒等式證明重點：理解并掌握同角三角函數(shù)基本關(guān)系式的推導(dǎo)及應(yīng)用； 難點：會利用同角三角函數(shù)的基本關(guān)系式進行化簡、求值與恒等式證明．
