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人教版高中數(shù)學(xué)選擇性必修二變化率問題教學(xué)設(shè)計(jì)
導(dǎo)語(yǔ)在必修第一冊(cè)中，我們研究了函數(shù)的單調(diào)性，并利用函數(shù)單調(diào)性等知識(shí)，定性的研究了一次函數(shù)、指數(shù)函數(shù)、對(duì)數(shù)函數(shù)增長(zhǎng)速度的差異，知道“對(duì)數(shù)增長(zhǎng)” 是越來(lái)越慢的，“指數(shù)爆炸” 比“直線上升” 快得多，進(jìn)一步的能否精確定量的刻畫變化速度的快慢呢，下面我們就來(lái)研究這個(gè)問題。新知探究問題1 高臺(tái)跳水運(yùn)動(dòng)員的速度高臺(tái)跳水運(yùn)動(dòng)中，運(yùn)動(dòng)員在運(yùn)動(dòng)過程中的重心相對(duì)于水面的高度h(單位：m)與起跳后的時(shí)間t(單位：s)存在函數(shù)關(guān)系h(t)＝－4.9t2＋4.8t＋11.如何描述用運(yùn)動(dòng)員從起跳到入水的過程中運(yùn)動(dòng)的快慢程度呢？直覺告訴我們，運(yùn)動(dòng)員從起跳到入水的過程中，在上升階段運(yùn)動(dòng)的越來(lái)越慢，在下降階段運(yùn)動(dòng)的越來(lái)越快，我們可以把整個(gè)運(yùn)動(dòng)時(shí)間段分成許多小段，用運(yùn)動(dòng)員在每段時(shí)間內(nèi)的平均速度v ?近似的描述它的運(yùn)動(dòng)狀態(tài)。
人教版高中數(shù)學(xué)選擇性必修二導(dǎo)數(shù)的概念及其幾何意義教學(xué)設(shè)計(jì)
新知探究前面我們研究了兩類變化率問題：一類是物理學(xué)中的問題，涉及平均速度和瞬時(shí)速度；另一類是幾何學(xué)中的問題，涉及割線斜率和切線斜率。這兩類問題來(lái)自不同的學(xué)科領(lǐng)域，但在解決問題時(shí)，都采用了由“平均變化率”逼近“瞬時(shí)變化率”的思想方法；問題的答案也是一樣的表示形式。下面我們用上述思想方法研究更一般的問題。探究1： 對(duì)于函數(shù)y=f(x) ，設(shè)自變量x從x_0變化到x_0+ ?x ，相應(yīng)地，函數(shù)值y就從f(x_0)變化到f(〖x+x〗_0) 。這時(shí)， x的變化量為?x，y的變化量為?y=f(x_0+?x)-f(x_0)我們把比值?y/?x，即?y/?x=(f(x_0+?x)-f(x_0)" " )/?x叫做函數(shù)從x_0到x_0+?x的平均變化率。1．導(dǎo)數(shù)的概念如果當(dāng)Δx→0時(shí)，平均變化率ΔyΔx無(wú)限趨近于一個(gè)確定的值，即ΔyΔx有極限，則稱y＝f (x)在x＝x0處____，并把這個(gè)________叫做y＝f (x)在x＝x0處的導(dǎo)數(shù)(也稱為__________)，記作f ′(x0)或________，即
人教版高中數(shù)學(xué)選擇性必修二等比數(shù)列的概念 (2) 教學(xué)設(shè)計(jì)
二、典例解析例4. 用 10 000元購(gòu)買某個(gè)理財(cái)產(chǎn)品一年.（1）若以月利率0.400%的復(fù)利計(jì)息，12個(gè)月能獲得多少利息（精確到1元）？（2）若以季度復(fù)利計(jì)息，存4個(gè)季度，則當(dāng)每季度利率為多少時(shí)，按季結(jié)算的利息不少于按月結(jié)算的利息（精確到10^(-5)）？分析：復(fù)利是指把前一期的利息與本金之和算作本金，再計(jì)算下一期的利息.所以若原始本金為a元，每期的利率為r ，則從第一期開始，各期的本利和a , a(1+r)，a(1+r)^2…構(gòu)成等比數(shù)列.解：（1）設(shè)這筆錢存 n 個(gè)月以后的本利和組成一個(gè)數(shù)列{a_n }，則{a_n }是等比數(shù)列，首項(xiàng)a_1=10^4 (1+0.400%)，公比 q=1+0.400%，所以a_12=a_1 q^11 〖=10〗^4 (1+0.400%)^12≈10 490.7.所以，12個(gè)月后的利息為10 490.7-10^4≈491（元）.解：（2）設(shè)季度利率為 r ，這筆錢存 n 個(gè)季度以后的本利和組成一個(gè)數(shù)列{b_n }，則{b_n }也是一個(gè)等比數(shù)列，首項(xiàng) b_1=10^4 (1+r)，公比為1+r，于是 b_4=10^4 (1+r)^4.
人教版高中數(shù)學(xué)選擇性必修二等比數(shù)列的前n項(xiàng)和公式 (1) 教學(xué)設(shè)計(jì)
新知探究國(guó)際象棋起源于古代印度.相傳國(guó)王要獎(jiǎng)賞國(guó)際象棋的發(fā)明者，問他想要什么.發(fā)明者說(shuō)：“請(qǐng)?jiān)谄灞P的第1個(gè)格子里放上1顆麥粒，第2個(gè)格子里放上2顆麥粒，第3個(gè)格子里放上4顆麥粒，依次類推，每個(gè)格子里放的麥粒都是前一個(gè)格子里放的麥粒數(shù)的2倍，直到第64個(gè)格子.請(qǐng)給我足夠的麥粒以實(shí)現(xiàn)上述要求.”國(guó)王覺得這個(gè)要求不高，就欣然同意了.假定千粒麥粒的質(zhì)量為40克，據(jù)查，2016--2017年度世界年度小麥產(chǎn)量約為7.5億噸，根據(jù)以上數(shù)據(jù)，判斷國(guó)王是否能實(shí)現(xiàn)他的諾言.問題1：每個(gè)格子里放的麥粒數(shù)可以構(gòu)成一個(gè)數(shù)列,請(qǐng)判斷分析這個(gè)數(shù)列是否是等比數(shù)列?并寫出這個(gè)等比數(shù)列的通項(xiàng)公式.是等比數(shù)列,首項(xiàng)是1，公比是2，共64項(xiàng). 通項(xiàng)公式為〖a_n=2〗^(n-1)問題2：請(qǐng)將發(fā)明者的要求表述成數(shù)學(xué)問題.
人教版高中數(shù)學(xué)選擇性必修二等差數(shù)列的概念（1）教學(xué)設(shè)計(jì)
我們知道數(shù)列是一種特殊的函數(shù)，在函數(shù)的研究中，我們?cè)诶斫饬撕瘮?shù)的一般概念，了解了函數(shù)變化規(guī)律的研究?jī)?nèi)容（如單調(diào)性，奇偶性等）后，通過研究基本初等函數(shù)不僅加深了對(duì)函數(shù)的理解，而且掌握了冪函數(shù)，指數(shù)函數(shù)，對(duì)數(shù)函數(shù)，三角函數(shù)等非常有用的函數(shù)模型。類似地，在了解了數(shù)列的一般概念后，我們要研究一些具有特殊變化規(guī)律的數(shù)列，建立它們的通項(xiàng)公式和前n項(xiàng)和公式，并應(yīng)用它們解決實(shí)際問題和數(shù)學(xué)問題，從中感受數(shù)學(xué)模型的現(xiàn)實(shí)意義與應(yīng)用，下面，我們從一類取值規(guī)律比較簡(jiǎn)單的數(shù)列入手。新知探究1.北京天壇圜丘壇，的地面有十板布置，最中間是圓形的天心石，圍繞天心石的是9圈扇環(huán)形的石板，從內(nèi)到外各圈的示板數(shù)依次為9,18,27,36,45,54,63,72,81 ①2.S，M，L，XL，XXL，XXXL型號(hào)的女裝上對(duì)應(yīng)的尺碼分別是38,40,42,44,46,48 ②3.測(cè)量某地垂直地面方向上海拔500米以下的大氣溫度，得到從距離地面20米起每升高100米處的大氣溫度（單位℃）依次為25,24,23,22,21 ③
人教版高中數(shù)學(xué)選擇性必修二等差數(shù)列的概念（2）教學(xué)設(shè)計(jì)
二、典例解析例3.某公司購(gòu)置了一臺(tái)價(jià)值為220萬(wàn)元的設(shè)備，隨著設(shè)備在使用過程中老化，其價(jià)值會(huì)逐年減少.經(jīng)驗(yàn)表明，每經(jīng)過一年其價(jià)值會(huì)減少d(d為正常數(shù)）萬(wàn)元.已知這臺(tái)設(shè)備的使用年限為10年，超過10年 ，它的價(jià)值將低于購(gòu)進(jìn)價(jià)值的5%，設(shè)備將報(bào)廢.請(qǐng)確定d的范圍.分析：該設(shè)備使用n年后的價(jià)值構(gòu)成數(shù)列{an}，由題意可知，an＝an－1－d (n≥2). 即：an－an－1＝－d.所以{an}為公差為－d的等差數(shù)列.10年之內(nèi)（含10年），該設(shè)備的價(jià)值不小于（220×5%=）11萬(wàn)元；10年后，該設(shè)備的價(jià)值需小于11萬(wàn)元．利用{an}的通項(xiàng)公式列不等式求解．解：設(shè)使用n年后，這臺(tái)設(shè)備的價(jià)值為an萬(wàn)元，則可得數(shù)列{an}．由已知條件，得an＝an－1－d（n≥2）．所以數(shù)列{an}是一個(gè)公差為－d的等差數(shù)列.因?yàn)閍1＝220－d，所以an＝220－d＋(n－1)(－d)＝220－nd. 由題意，得a10≥11，a11＜11. 即：{█("220－10d≥11" @"220－11d＜11" )┤解得19<d≤20.9所以，d的求值范圍為19<d≤20.9
人教版高中數(shù)學(xué)選擇性必修二等比數(shù)列的前n項(xiàng)和公式 (2) 教學(xué)設(shè)計(jì)
二、典例解析例10. 如圖，正方形ABCD 的邊長(zhǎng)為5cm ，取正方形ABCD 各邊的中點(diǎn)E,F,G,H, 作第2個(gè)正方形 EFGH，然后再取正方形EFGH各邊的中點(diǎn)I,J,K,L，作第3個(gè)正方形IJKL ，依此方法一直繼續(xù)下去. (1) 求從正方形ABCD 開始，連續(xù)10個(gè)正方形的面積之和；(2) 如果這個(gè)作圖過程可以一直繼續(xù)下去，那么所有這些正方形的面積之和將趨近于多少？分析：可以利用數(shù)列表示各正方形的面積，根據(jù)條件可知，這是一個(gè)等比數(shù)列。解：設(shè)正方形的面積為a_1，后續(xù)各正方形的面積依次為a_2, a_(3, ) 〖…,a〗_n,…，則a_1=25,由于第k+1個(gè)正方形的頂點(diǎn)分別是第k個(gè)正方形各邊的中點(diǎn)，所以a_(k+1)=〖1/2 a〗_k,因此{(lán)a_n}，是以25為首項(xiàng)，1/2為公比的等比數(shù)列.設(shè){a_n}的前項(xiàng)和為S_n（1）S_10=(25×[1-(1/2)^10 ] )/("1 " -1/2)=50×[1-(1/2)^10 ]=25575/512所以，前10個(gè)正方形的面積之和為25575/512cm^2.(2)當(dāng)無(wú)限增大時(shí)，無(wú)限趨近于所有正方形的面積和
人教版高中數(shù)學(xué)選擇性必修二數(shù)列的概念（1）教學(xué)設(shè)計(jì)
情景導(dǎo)學(xué)古語(yǔ)云:“勤學(xué)如春起之苗,不見其增,日有所長(zhǎng)”如果對(duì)“春起之苗”每日用精密儀器度量,則每日的高度值按日期排在一起,可組成一個(gè)數(shù)列. 那么什么叫數(shù)列呢?二、問題探究1. 王芳從一歲到17歲，每年生日那天測(cè)量身高，將這些身高數(shù)據(jù)（單位：厘米）依次排成一列數(shù)：75,87,96,103,110,116,120,128,138，145,153,158,160,162,163,165,168 ①記王芳第i歲的身高為 h_i ，那么h_1=75 , h_2=87, 〖"…" ，h〗_17=168.我們發(fā)現(xiàn)h_i中的i反映了身高按歲數(shù)從1到17的順序排列時(shí)的確定位置，即h_1=75 是排在第1位的數(shù)，h_2=87是排在第2位的數(shù)〖"…" ，h〗_17 =168是排在第17位的數(shù)，它們之間不能交換位置，所以①具有確定順序的一列數(shù)。2. 在兩河流域發(fā)掘的一塊泥板（編號(hào)K90，約生產(chǎn)于公元前7世紀(jì)）上，有一列依次表示一個(gè)月中從第1天到第15天，每天月亮可見部分的數(shù)：5,10,20,40,80,96,112,128,144,160,176,192,208,224,240. ②
人教版高中數(shù)學(xué)選擇性必修二等差數(shù)列的前n項(xiàng)和公式（2）教學(xué)設(shè)計(jì)
課前小測(cè)1．思考辨析(1)若Sn為等差數(shù)列{an}的前n項(xiàng)和，則數(shù)列Snn也是等差數(shù)列．( )(2)若a1>0，d<0，則等差數(shù)列中所有正項(xiàng)之和最大．( )(3)在等差數(shù)列中，Sn是其前n項(xiàng)和，則有S2n－1＝(2n－1)an.( )[答案] (1)√ (2)√ (3)√2．在項(xiàng)數(shù)為2n＋1的等差數(shù)列中，所有奇數(shù)項(xiàng)的和為165，所有偶數(shù)項(xiàng)的和為150，則n等于( )A．9 B．10 C．11 D．12B [∵S奇S偶＝n＋1n，∴165150＝n＋1n.∴n＝10.故選B項(xiàng)．]3．等差數(shù)列{an}中，S2＝4，S4＝9，則S6＝________.15 [由S2，S4－S2，S6－S4成等差數(shù)列得2(S4－S2)＝S2＋(S6－S4)解得S6＝15.]4．已知數(shù)列{an}的通項(xiàng)公式是an＝2n－48，則Sn取得最小值時(shí)，n為________.23或24 [由an≤0即2n－48≤0得n≤24.∴所有負(fù)項(xiàng)的和最小，即n＝23或24.]二、典例解析例8.某校新建一個(gè)報(bào)告廳，要求容納800個(gè)座位，報(bào)告廳共有20排座位，從第2排起后一排都比前一排多兩個(gè)座位. 問第1排應(yīng)安排多少個(gè)座位？分析：將第1排到第20排的座位數(shù)依次排成一列，構(gòu)成數(shù)列{an} ，設(shè)數(shù)列{an} 的前n項(xiàng)和為S_n。
人教版高中數(shù)學(xué)選擇性必修二函數(shù)的單調(diào)性(1) 教學(xué)設(shè)計(jì)
1．判斷正誤(正確的打“√”，錯(cuò)誤的打“×”)(1)函數(shù)f (x)在區(qū)間(a，b)上都有f ′(x)＜0，則函數(shù)f (x)在這個(gè)區(qū)間上單調(diào)遞減． ( )(2)函數(shù)在某一點(diǎn)的導(dǎo)數(shù)越大，函數(shù)在該點(diǎn)處的切線越“陡峭”． ( )(3)函數(shù)在某個(gè)區(qū)間上變化越快，函數(shù)在這個(gè)區(qū)間上導(dǎo)數(shù)的絕對(duì)值越大．( )(4)判斷函數(shù)單調(diào)性時(shí)，在區(qū)間內(nèi)的個(gè)別點(diǎn)f ′(x)＝0，不影響函數(shù)在此區(qū)間的單調(diào)性．( )[解析] (1)√ 函數(shù)f (x)在區(qū)間(a，b)上都有f ′(x)＜0，所以函數(shù)f (x)在這個(gè)區(qū)間上單調(diào)遞減，故正確．(2)× 切線的“陡峭”程度與|f ′(x)|的大小有關(guān)，故錯(cuò)誤．(3)√ 函數(shù)在某個(gè)區(qū)間上變化的快慢，和函數(shù)導(dǎo)數(shù)的絕對(duì)值大小一致．(4)√ 若f ′(x)≥0(≤0)，則函數(shù)f (x)在區(qū)間內(nèi)單調(diào)遞增(減)，故f ′(x)＝0不影響函數(shù)單調(diào)性．[答案] (1)√ (2)× (3)√ (4)√例1. 利用導(dǎo)數(shù)判斷下列函數(shù)的單調(diào)性:（1）f(x)=x^3+3x; （2） f(x)=sinx-x,x∈(0,π); (3)f(x)=(x-1)/x解: (1) 因?yàn)閒(x)=x^3+3x, 所以f^' (x)=〖3x〗^2+3=3(x^2+1)>0所以f(x)=x^3+3x ，函數(shù)在R上單調(diào)遞增，如圖（1）所示
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. 他們演奏的音樂聽起來(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。Seeing is believing. 眼見為實(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-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)二
Step 3 Analyzing article structureActivity 31. Teachers raise questions to guide students to analyze the chapter structure of this diary and think about how to describe the festival experience. (1)What should be included in the opening/body/closing paragraph(s)?(2)How did the writer arrange his/her ideas?(3)What kind of interesting details did the writer describe?(4)How did the writer describe his/her feelings/emotions during the event?2. Students read and compare the three sentence patterns in activity 2. Try to rewrite the first paragraph of the diary with these three sentence patterns. After that, students exchange corrections with their partners. Such as:●This was my first time spending three days experiencing the Naadam Festival in China’s Inner Mongolia Autonomous Region and it was an enjoyable and exciting experience. ●I'll never forget my experience at the Naadam Festival because it was my first time to watch the exciting Mongolian games of horse racing, wrestling, and archery so closely. ●I'll always remember my first experience at the Naadam Festival in China’s Inner Mongolia Autonomous Region because it was so amazing to spend three days witnessing a grand Mongolian ceremony. Step 4 Accumulation of statementsActivity 41. Ask the students to read the diary again. Look for sentences that express feelings and emotions, especially those with the -ing form and the past participle. Such as:● …h(huán)orse racing, wrestling, and archery, which are all so exciting to watch. ● some amazing performances● I was surprised to see…● I was a little worried about. . . ● feeling really tiredOther emotional statements:●I absolutely enjoyed the archery, too, but the horse races were my favourite part. ●I'm finally back home now, feeling really tired, but celebrating Naadam with my friend was totally worth it. ●He invited me back for the winter to stay in a traditional Mongolian tent and cat hot pot. I can’t wait!2. In addition to the use of the -ing form and the past participle, the teacher should guide the students in the appreciation of these statements, ask them to memorize them, and encourage them to use them reasonably in writing practice.
新人教版高中英語(yǔ)必修3Unit 5 The Value of Money-Listening &Speaking＆Talking教學(xué)設(shè)計(jì)
4. A：We’d like to have someone to say a word at the beginning to welcome the group.B：↙Who?A：We thought that you or Dr.Johnson might do it.B用降調(diào)說(shuō)Who，其意思是問，對(duì)方想讓誰(shuí)在開場(chǎng)時(shí)致歡迎詞。Step 6 Pronunciation---Practice1. Listen to the short conversation and mark the intonation with ↗, ↙ or ↙, ↗. Then discuss with a partner what they intend to convey by using different intonation.Owner: You know what ?↗ It’s a million-pound bank note↙.Waiter 1: Really ?↗(question)Waiter 2: Really !↙(unbelievable and surprised)Waiter 3: Really ?!↙↗(first question then surprised)2. Listen to the conversations. Underline the parts that are stressed and mark the intonation. Then talk about the implied meanings of the responses with different intonations. Listen again and repeat.1) Henry: It’s a nice suit.Owner: Oh, it’s perfect!↙(The intonation means it is very suitable for Henry.)2) Henry: Well, that’s very kind of you.Owner: Kind, sir ?↗(what you said is not right) No, it’s kind of you. You must come whenever you want and have whatever you like. Just having you sit here is a great honour !!↙(welcome you to come again)3)Henry:Well, to be honest, I have none. Oliver:(happily) What luck!(excited) Brother↗, what luck!↙(It means “Didn’t you hear it?”)Henry: Well, it may seem lucky to you but not to me!↗(angry) If this is your idea of some kind of joke, I don’t think it’s very funny. Now if you’ll excuse me, I ought to be on my way.↙(If so, I would leave.)Roderick: Please don’t go↙...(hope Henry can wait for a moment)Part B Viewing and Talking---Describe people’s changing attitudes in a film clipStep 1 Before-listening---Tell the filmYou are going to watch part of the film The Million Pound Bank Note. Look at these photos and guess what happens in the film.
新人教版高中英語(yǔ)必修3Unit 5 The value of money-Reading and Thinking教學(xué)設(shè)計(jì)二
? Could you offer me some kind of work here?? I don’t want your charity, I just want an honest job.? Careless: I landed in Britain by accident.Step 7:Consolidation.? Find Henry? Roderick and Oliver were I .making a bet when they saw Henry, a poor young man. ? Know Henry? About a month ago, Henry was sailing and later he found himself carried out to sea by a strong wind. Fortunately, he 2.was spotted by a ship. And it was the ship that brought him to 3.England? Offer money to Henry ? Oliver and Roderick gave Henry a letter and told him that there was money in it. They 4.persuaded him to accept it, and made him 5.promise that it wouldn't be opened until 2 o'clock.Step 8：Language pointsa large amount of: a large quantity of; a great deal ofe.g. They bought a large amount of furniture before they moved their new house.make a bet: make an arrangement to risk money, etc. on an event of which the result is doubtful.e.g. We made a bet on the result of the match.permit sb to do something: allow somebody to do somethinge.g. My mother doesn’t permit me to ride in the street after it rained.by accident: as a result of chancee.g. I only found it by accident.stare at: look at somebody or something with the eyes wide open in a fixed gaze( in astonishment, wonder, fear, etc)to be honest: to tell you the truth; to be franke.g. To be honest, I don’t think we have a chance of winning.Step7 Homework:What do you think will happen to Henry? Will the bank-note help him or get him into trouble?
人教版高中數(shù)學(xué)選擇性必修二導(dǎo)數(shù)的四則運(yùn)算法則教學(xué)設(shè)計(jì)
求函數(shù)的導(dǎo)數(shù)的策略(1)先區(qū)分函數(shù)的運(yùn)算特點(diǎn)，即函數(shù)的和、差、積、商，再根據(jù)導(dǎo)數(shù)的運(yùn)算法則求導(dǎo)數(shù)；(2)對(duì)于三個(gè)以上函數(shù)的積、商的導(dǎo)數(shù)，依次轉(zhuǎn)化為“兩個(gè)”函數(shù)的積、商的導(dǎo)數(shù)計(jì)算．跟蹤訓(xùn)練1 求下列函數(shù)的導(dǎo)數(shù)：(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.跟蹤訓(xùn)練2 求下列函數(shù)的導(dǎo)數(shù)（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 日常生活中的飲用水通常是經(jīng)過凈化的，隨著水的純凈度的提高，所需進(jìn)化費(fèi)用不斷增加，已知將1t水進(jìn)化到純凈度為x%所需費(fèi)用（單位：元），為c(x)=5284/(100-x) (80<x<100)求進(jìn)化到下列純凈度時(shí)，所需進(jìn)化費(fèi)用的瞬時(shí)變化率：（1） 90% ；（2） 98%解：凈化費(fèi)用的瞬時(shí)變化率就是凈化費(fèi)用函數(shù)的導(dǎo)數(shù)；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
高中思想政治人教版必修三《文化創(chuàng)新的途徑》說(shuō)課稿
二、說(shuō)學(xué)情本課的教學(xué)對(duì)象為高二學(xué)生，他們思維活躍已具備一定歸納能力和分析、綜合能力，能夠自主地分析現(xiàn)實(shí)生活中的一些文化行為，但看問題往往比較偏激、片面，缺乏良好的邏輯思維能力。所以，在文化創(chuàng)新的途徑上要對(duì)他們進(jìn)行指導(dǎo)，以免走入誤區(qū)。三、教學(xué)目標(biāo)根據(jù)新課程標(biāo)準(zhǔn)、教材特點(diǎn)、學(xué)生的實(shí)際，我確定了如下教學(xué)目標(biāo)：【知識(shí)與能力目標(biāo)】1.理解文化創(chuàng)新的根本途徑和兩個(gè)基本途徑;2.了解文化創(chuàng)新過程中需要堅(jiān)持正確方向，克服錯(cuò)誤傾向。
人教A版高中數(shù)學(xué)必修二復(fù)數(shù)的三角表示教學(xué)設(shè)計(jì)
本節(jié)內(nèi)容是復(fù)數(shù)的三角表示，是復(fù)數(shù)與三角函數(shù)的結(jié)合，是對(duì)復(fù)數(shù)的拓展延伸，這樣更有利于我們對(duì)復(fù)數(shù)的研究。1.數(shù)學(xué)抽象：利用復(fù)數(shù)的三角形式解決實(shí)際問題；2.邏輯推理：通過課堂探究逐步培養(yǎng)學(xué)生的邏輯思維能力；3.數(shù)學(xué)建模：掌握復(fù)數(shù)的三角形式；4.直觀想象：利用復(fù)數(shù)三角形式解決一系列實(shí)際問題；5.數(shù)學(xué)運(yùn)算:能夠正確運(yùn)用復(fù)數(shù)三角形式計(jì)算復(fù)數(shù)的乘法、除法；6.數(shù)據(jù)分析:通過經(jīng)歷提出問題—推導(dǎo)過程—得出結(jié)論—例題講解—練習(xí)鞏固的過程，讓學(xué)生認(rèn)識(shí)到數(shù)學(xué)知識(shí)的邏輯性和嚴(yán)密性。復(fù)數(shù)的三角形式、復(fù)數(shù)三角形式乘法、除法法則及其幾何意義舊知導(dǎo)入：?jiǎn)栴}一：你還記得復(fù)數(shù)的幾何意義嗎？問題二：我們知道，向量也可以由它的大小和方向唯一確定，那么能否借助向量的大小和方向這兩個(gè)要素來(lái)表示復(fù)數(shù)呢？如何表示？
人教A版高中數(shù)學(xué)必修二平面與平面垂直教學(xué)設(shè)計(jì)
6. 例二：如圖，AB是⊙O的直徑，PA垂直于⊙O所在的平面，C是圓周上的一點(diǎn)，且PA＝AC，求二面角P－BC－A的大?。?解：由已知PA⊥平面ABC，BC在平面ABC內(nèi)∴PA⊥BC∵AB是⊙O的直徑，且點(diǎn)C在圓周上，∴AC⊥BC又∵PA∩AC=A,PA,AC在平面PAC內(nèi)，∴BC⊥平面PAC又PC在平面PAC內(nèi)，∴PC⊥BC又∵BC是二面角P-BC-A的棱，∴∠PCA是二面角P-BC-A的平面角由PA=AC知△PAC是等腰直角三角形∴∠PCA=45°，即二面角P-BC-A的大小是45°7.面面垂直定義一般地，兩個(gè)平面相交，如果它們所成的二面角是直二面角，就說(shuō)這兩個(gè)平面互相垂直，平面α與β垂直，記作α⊥β8. 探究：建筑工人在砌墻時(shí)，常用鉛錘來(lái)檢測(cè)所砌的墻面與地面是否垂直，如果系有鉛錘的細(xì)繩緊貼墻面，工人師傅被認(rèn)為墻面垂直于地面，否則他就認(rèn)為墻面不垂直于地面，這種方法說(shuō)明了什么道理？
人教A版高中數(shù)學(xué)必修二總體離散程度的估計(jì)教學(xué)設(shè)計(jì)
問題二：上述問題中，甲、乙的平均數(shù)、中位數(shù)、眾數(shù)相同，但二者的射擊成績(jī)存在差異，那么，如何度量這種差異呢？我們可以利用極差進(jìn)行度量。根據(jù)上述數(shù)據(jù)計(jì)算得：甲的極差=10-4=6 乙的極差=9-5=4極差在一定程度上刻畫了數(shù)據(jù)的離散程度。由極差發(fā)現(xiàn)甲的成績(jī)波動(dòng)范圍比乙的大。但由于極差只使用了數(shù)據(jù)中最大、最小兩個(gè)值的信息，所含的信息量很少。也就是說(shuō)，極差度量出的差異誤差較大。問題三：你還能想出其他刻畫數(shù)據(jù)離散程度的辦法嗎？我們知道，如果射擊的成績(jī)很穩(wěn)定，那么大多數(shù)的射擊成績(jī)離平均成績(jī)不會(huì)太遠(yuǎn)；相反，如果射擊的成績(jī)波動(dòng)幅度很大，那么大多數(shù)的射擊成績(jī)離平均成績(jī)會(huì)比較遠(yuǎn)。因此，我們可以通過這兩組射擊成績(jī)與它們的平均成績(jī)的“平均距離”來(lái)度量成績(jī)的波動(dòng)幅度。