不等式和不等式組課件

1、9.4 課題學(xué)習(xí)(二)9.4 課題學(xué)習(xí)(二) 教學(xué)目標(biāo) 一、知識(shí)與技能目標(biāo) 學(xué)會(huì)運(yùn)用不等式及不等式組對(duì)一些體育比賽的勝負(fù)進(jìn)行分析,讓學(xué)生感知生活離不開數(shù)學(xué),學(xué)數(shù)學(xué)知識(shí)是更好地為解決實(shí)際問題服務(wù). 二、過程與方法目標(biāo) 給出具體案例讓學(xué)生進(jìn)行分析,激發(fā)學(xué)生對(duì)體育事業(yè)的關(guān)心和愛戴,對(duì)體育成績(jī)的優(yōu)劣與國民素質(zhì)關(guān)系的理解,激發(fā)學(xué)生的愛國精神和主人翁意識(shí). 三、情感態(tài)度與價(jià)值觀目標(biāo) 體育事業(yè)的發(fā)展與否從某方面來說,代表一個(gè)國家的強(qiáng)盛,代表一個(gè)國家在國際上的地位和知名度,體育健兒在賽場(chǎng)上為國爭(zhēng)光,我們有學(xué)習(xí)他們的精神的必要性,同時(shí)還要能利用所學(xué)不等式組,對(duì)問題進(jìn)行分析、求解. 教學(xué)目 1.某果品公司要請(qǐng)汽車

2、運(yùn)輸公司或火車貨運(yùn)站將60噸水果從A地運(yùn)到B地.已知汽車和火車從A地到B地的運(yùn)輸路程都是s千米,兩家運(yùn)輸單位除都要收取運(yùn)輸途中每噸每小時(shí)5元的冷藏外,其他要收取的費(fèi)用和有關(guān)運(yùn)輸資料由下表列出:運(yùn)輸工具行駛速度(千米/時(shí))運(yùn)費(fèi)單價(jià)(元/噸.千米)裝卸費(fèi)用汽車5023000火車801.74620 (1)分別寫出這兩家運(yùn)輸單位運(yùn)送這批水果所要收取的總費(fèi)用y1(元)和y2(元)(用含s的式子表示) (2)為減少費(fèi)用,你認(rèn)為果品公司應(yīng)該選拔哪一家運(yùn)輸單位運(yùn)送水果更為合算? 1.某果品公司要請(qǐng)汽車運(yùn)輸公司或火車貨運(yùn)站將60噸2.某車間生產(chǎn)機(jī)器零件,若每天比預(yù)定計(jì)劃多做一件,8天所做零件的總數(shù)超過100件,

3、如果每天比預(yù)定計(jì)劃少做一件,那么8天可做零件的總數(shù)不到90件,問預(yù)定計(jì)劃每天做多少件?(件數(shù)是正整數(shù))3.一次智力測(cè)驗(yàn),有20道選擇題.評(píng)分標(biāo)準(zhǔn)為:對(duì)一題給5分,錯(cuò)一題扣2分,不答題不給分也不扣分.小明有兩道題未答.至少答對(duì)幾道題,總分才不會(huì)低于60分?2.某車間生產(chǎn)機(jī)器零件,若每天比預(yù)定計(jì)劃多做一件,8天所做零4.下面是同學(xué)們玩過的“錘子、剪子、布”的游戲規(guī)則：游戲在兩位同學(xué)之間進(jìn)行，伸出拳頭表示“錘子”，伸出食指和中指表示“剪子”，伸出手掌表示“布”，兩人同時(shí)口念“錘子、剪子、布”，一念到“布”，同時(shí)出手，“布”贏“錘子”，“錘子”贏“剪子”，“剪子”贏“布”?，F(xiàn)在我們約定： “布”贏“錘

4、子”得9分，“錘子”贏“剪子”得5分，“剪子”贏“布”得2分。 （1）小明和某同學(xué)玩此游戲過程中，小明贏了21次，得108分，其中“剪子”贏“布”7次。聰明的同學(xué)，你能用所學(xué)的數(shù)學(xué)知識(shí)求出小明“布”贏“錘子”、“錘子”贏“剪子”各多少次？ （2）如果小明與某同學(xué)玩了若干次，得了30分，請(qǐng)你探究一下小明各種可能的贏法，并選擇其中的三種贏法填入下表。布”贏“錘子錘子”贏“剪子“剪子”贏“布”贏的次數(shù)4.下面是同學(xué)們玩過的“錘子、剪子、布”的游戲規(guī)則：游戲在兩 5.在雙休日，某公司決定組織48名員工到附近一水上公園坐船游玩，公司先派一個(gè)人去了解船只的租金情況，這個(gè)人看到的租金價(jià)格表如下表，那么，怎樣

5、設(shè)計(jì)租船方案才能使所付租金最少（嚴(yán)禁超載）？船型每只限載人數(shù)每只租金（元）大船53小船32 5.在雙休日，某公司決定組織48名員工到附近一水上6.小王家里裝修，他去商店買燈，商店柜臺(tái)里現(xiàn)有功率為100瓦的白熾燈和40瓦的節(jié)能燈，它們的單價(jià)分別為2元和32元，經(jīng)了解知這兩種燈的照明效果和使用壽命都一樣，已知小王家所在地的電價(jià)為每度0.5元,請(qǐng)問當(dāng)這兩種燈的使用壽命超過多長(zhǎng)時(shí)間時(shí),小王選擇節(jié)能燈才合算?6.小王家里裝修，他去商店買燈，商店柜臺(tái)里現(xiàn)有功率為100瓦7.為了改善城鄉(xiāng)人民生產(chǎn)、生活環(huán)境，我市投入大量資金治理某河流污染，在城效建立了一個(gè)綜合性污水處理廠。設(shè)庫池中存有待處理的污水a(chǎn)噸，從城區(qū)

6、流入庫池的污水按每小時(shí)b噸的固定流量增加。如果同時(shí)開動(dòng)2臺(tái)機(jī)組需30小時(shí)處理完污水。同時(shí)開動(dòng)4臺(tái)機(jī)組需10小時(shí)處理完污水。若要求在5小時(shí)內(nèi)將污水處理完畢，那么至少要同時(shí)開動(dòng)多少臺(tái)機(jī)組？7.為了改善城鄉(xiāng)人民生產(chǎn)、生活環(huán)境，我市投入大量資金治理某河8.市里某童裝加工企業(yè)今年五月份工人每人平均加工童裝150套,最不熟練的工人加工的童裝套數(shù)為平均套數(shù)的60%.為了提高工人的勞動(dòng)積極性,按時(shí)完成外商訂貨任務(wù),企業(yè)計(jì)劃從六月份進(jìn)行工資改革.改革后每位工人的工資分兩部分:一部分為每人每月基本工資200元;另一部分為每加工1套童裝獎(jiǎng)勵(lì)若干元.(1)為了保證所有工人的每月工資收入不低于市有關(guān)部門規(guī)定的最低工資標(biāo)

7、準(zhǔn)450元,按五月份工人加工的童裝套數(shù)計(jì)算,工人每加工1套童裝企業(yè)至少應(yīng)獎(jiǎng)勵(lì)多少元(精確到分)?(2)根據(jù)經(jīng)營(yíng)情況,企業(yè)決定每加工1套童裝獎(jiǎng)勵(lì)5元,工人小張爭(zhēng)取六月份工資不少于1200元,問小張?jiān)诹路輵?yīng)至少加工多少套童裝?8.市里某童裝加工企業(yè)今年五月份工人每人平均加工童裝150套 1.一臺(tái)裝載機(jī)每小時(shí)可裝載石料50噸.一堆石料的質(zhì)量在1800噸至2200噸之間,那么這臺(tái)裝載機(jī)大約要用多長(zhǎng)時(shí)間才能將這堆石料裝完? 2.大、小盒子共裝球99個(gè),每個(gè)大盒裝12,小盒裝5個(gè),恰好裝完,盒子個(gè)數(shù)大于10,問:大小盒子各多少個(gè)?作業(yè) 1.一臺(tái)裝載機(jī)每小時(shí)可裝載石料50噸.一堆石料的質(zhì)量初一英語第二學(xué)期

8、同步串講 第七講 Do you have an eraser?初一英語第二學(xué)期同步串講 Do you have a soccer ball?不等式和不等式組PPT課件soccer basketballbadmintonbaseballball gamessoccer basketballbadmintonbasetennis (racket)volleyballgolfPing pong (ball) table tennis tennis (racket)volleyballgolfPDo you have an American football / rugby?Yes, I do. /N

9、o, I dont.Do you have an American footbaGolf clubDo you have a golf ball?Yes, I do. / No, I dont.Golf clubDo you have a golf baGroup workNames Do you have a?Balls you haveLucyYes, I do. basketballWhat balls do you have? I have .Group workNames Do you have a1. 你有一個(gè)排球嗎？ 是的，我有。2. 你有表兄妹嗎? 不, 我沒有。3. 她有網(wǎng)球

10、拍嗎？ 是的，她有。7. 咱們?nèi)ヌ咔虬伞o you have a volleyball? Yes, I do.Do you have any cousins? No,I dont.Does she have a tennis racket? Yes, she does.Lets play soccer.1. 你有一個(gè)排球嗎？ 是的，我有。Do you 4. 他有英英字典嗎？ 不，他沒有。他有一本英漢字典。5. 他們有筆記本嗎？ 是的，他們有。6. 讓我看一看。Does he have an English English dictionary? No,he doesnt. He has an

11、 English Chinese dictionary?Do they have any note books? Yes, they do.Lets have a look.4. 他有英英字典嗎？ 不，他沒有。他有一本英漢字典。DoeDoes he have a tennis racket?Yes, he does. /No, he doesnt.Does he have a tennis racket?YDoes she have a soccer ball?Yes, she does. / No, she doesnt.Does she have a soccer ball?YeDoes

12、he have a basketball?Yes, he does.Does he have a basketball?Yes,Do they have a puck?Yes, they do. /No, they dont.ice hockeyDo they have a puck?ice hockeyA: I want to play baseball. Do you have a baseball bat?B: No, I dont. A: Does your brother have one?B: Yes, he does. Lets go and find him. A: I wan

13、t to play baseball. DoLets play volleyball.That sounds good.Lets play volleyball.Lets play barbell.BarbellThat sounds boring.Lets play barbell.BarbellThatLets play bowling.That sounds interesting.Lets play bowling.That soundsLets play baseball.That sounds difficult.Lets play baseball.Lets go skatebo

14、arding.That sounds fun. (exciting)Lets go skateboarding.Lets play Ping Pong.That sounds relaxing.let sb. do sth.Lets have a break.Lets go and play Ping-pong. Lets play Ping Pong.let sb. dOur School Sports Center needs new members. Fill in the enrollment form if you want to join the clubs. First name

15、 _ Last name _Age _ Sex _Class _ Club _Reason _Whats your first name, please? How old are you? What class are you in? What club do you want to join? Why? (Because I like)Our School Sports Center need寫出反義詞dislike_ interesting _ good_ well_ easy_ lost _day _ different _big _ first _on _ in front of _t

16、his _ these _bring _寫出反義詞Fill in the blanks1. A: Excuse me, _ you _ a baseball?B: No, I _.A: _ Jim _ one?B: Yes, he _. Lets go and find him.2. A: Hi, Sally. B: Hi, Jane. A: Sally, _ _ my friend, Lucy. B: Hi, Lucy. _ to meet you. C: Nice to _ you, _.do havedontDoes havedoesthis isNice meet tooFill in

17、 the blanksdo A: Lets play volleyball.B: That _ interesting, but I _ have one.A: Well, _ you have a tennis bat?B: Yes, I _. Lets go and play tennis.A: Thats a good _.soundsdontdodoideaA: Lets play volleyball.soundDoes B have an eraser?Is the shop open? What day is today? What can they do? No, she do

18、esnt.No, it isnt. It is closed.Today is Friday.They go to the supermarket.Part 1Does B have an eraser?No, she What would B like? How much money does B have? Where is her purse? What does she do? She only has two yuan.Her purse is at home.She borrows four yuan from C.Part 2Shed like a red pencil and

19、a pencil-sharpener.What would B like? Part 2Shed Does Jim have a dictionary? Does Ann have a dictionary? Who has an English-Chinese dictionary?4. When can Li Lei give it back? Part 3No, he doesnt.Lucy has one. He can give it back next Monday.No, she doesnt. Does Jim have a dictionary? P close * clos

20、ed The shop closes at 8 pm. Please close the door. The door is closed. The shop is closed. The shop is open. close * closed The sh borrow from I borrow a book from him. May I borrow a pen from you? Dont borrow money from her. May I May I come in? May I borrow a pen from you? May I sit down? borrow f

21、rom I borrow a give back (to sb.) Please give the money back tomorrow.2. I can give the book back to him next week.3. Can you give my dictionary back this afternoon? give back (to sb.) PleThere is something wrong with There is something wrong with my TV / his pen / your computer.2. There is somethin

22、g wrong with him / her / you/the boy. Whats wrong with you? Whats wrong with your TV?There is something wrong with close * closed borrow from May I give back (to sb.) There is something wrong with close * closed borrYou are going to have a P.E class, think about some activities. Talk about them.Time

23、 _ Place _Sport _Reason _You are going to have a P.E clWritingWrite a passage about yourself and your friend. What sports do you play? What sports things do you have? What other things do you do? What about your friend? (parent)WritingWrite a passage about yKey points: Food Do you like bananas? Does

24、 he /she like bananas?Do you like bananas ?Key points: FoodDo you like bDo you like oranges?Yes, I do. No, I dont.Do you like oranges?Does he like apples?Yes, he does. No, he doesnt.Does he like apples?Does she like peaches?Yes, she does. No, she doesnt.Does she like peaches?Do they like grapes?Yes,

25、 they do. No, they dont.Do they like grapes?I like hamburgers for breakfast.But I dont like eggs.I like hamburgersBut I dont lDo your parents like pizza?Yes, they do.No, they dont. Do your parents like pizza?Does your father like beer?Yes, he does.No, he doesnt.Does your father like beer?Choose the

26、right words.There are five _( tomatoes, tomato) on the table.The _(child, children) are in the room.She _( doesnt like, dont like) chicken for lunch.He _(likes,like) hamburgers.Choose the right words.5. Do they_(likes, like) apples?6. Mike doesnt like_( bananas, banana).7. My mother doesnt have _(a lunch, lunch) at home.8. Does she _(like, likes) French fries?5. Do they_(likes, like) a用所給動(dòng)詞的適當(dāng)形式填空。She _(not like) salad._you _(like) oranges?He _(eat) lots of healthy food every day.There _(be) some chi