不等式和不等式组课件.ppt

1、 教学目标教学目标 一、知识与技能目标一、知识与技能目标 学会运用不等式及不等式组对一些体育比赛的胜负进行分析,让学生感知生活离不开数学,学数学知识是更好地为解决实际问题服务.二、过程与方法目标二、过程与方法目标 给出具体案例让学生进行分析,激发学生对体育事业的关心和爱戴,对体育成绩的优劣与国民素质关系的理解,激发学生的爱国精神和主人翁意识.三、情感态度与价值观目标三、情感态度与价值观目标 体育事业的发展与否从某方面来说,代表一个国家的强盛,代表一个国家在国际上的地位和知名度,体育健儿在赛场上为国争光,我们有学习他们的精神的必要性,同时还要能利用所学不等式组,对问题进行分析、求解.1.某果品公

2、司要请汽车运输公司或火车货运站将某果品公司要请汽车运输公司或火车货运站将60吨吨水果从水果从A地运到地运到B地地.已知汽车和火车从已知汽车和火车从A地到地到B地的运输地的运输路程都是路程都是s千米千米,两家运输单位除都要收取运输途中每吨每两家运输单位除都要收取运输途中每吨每小时小时5元的冷藏外元的冷藏外,其他要收取的费用和有关运输资料由下其他要收取的费用和有关运输资料由下表列出表列出:运输工具运输工具行驶速度行驶速度(千米千米/时时)运费单价运费单价(元元/吨吨.千米千米)装卸费用装卸费用汽车汽车5023000火车火车801.74620 (1)分别写出这两家运输单位运送这批水果所要收取的分别写

3、出这两家运输单位运送这批水果所要收取的总费用总费用y1(元元)和和y2(元元)(用含用含s的式子表示的式子表示)(2)为减少费用为减少费用,你认为果品公司应该选拔哪一家运输单你认为果品公司应该选拔哪一家运输单位运送水果更为合算位运送水果更为合算?2.某车间生产机器零件某车间生产机器零件,若每天比预定计划多做一若每天比预定计划多做一件件,8天所做零件的总数超过天所做零件的总数超过100件件,如果每天比预如果每天比预定计划少做一件定计划少做一件,那么那么8天可做零件的总数不到天可做零件的总数不到90件件,问预定计划每天做多少件问预定计划每天做多少件?(件数是正整数件数是正整数)3.一次智力测验一次

4、智力测验,有有20道选择题道选择题.评分标准为评分标准为:对一对一题给题给5分分,错一题扣错一题扣2分分,不答题不给分也不扣分不答题不给分也不扣分.小小明有两道题未答明有两道题未答.至少答对几道题至少答对几道题,总分才不会低总分才不会低于于60分分?4.下面是同学们玩过的下面是同学们玩过的“锤子、剪子、布锤子、剪子、布”的游戏规则：游戏在两的游戏规则：游戏在两位同学之间进行，伸出拳头表示位同学之间进行，伸出拳头表示“锤子锤子”，伸出食指和中指表示，伸出食指和中指表示“剪子剪子”，伸出手掌表示，伸出手掌表示“布布”，两人同时口念，两人同时口念“锤子、剪子、锤子、剪子、布布”，一念到，一念到“布布

5、”，同时出手，同时出手，“布布”赢赢“锤子锤子”，“锤子锤子”赢赢“剪子剪子”，“剪子剪子”赢赢“布布”。现在我们约定：。现在我们约定：“布布”赢赢“锤子锤子”得得9分，分，“锤子锤子”赢赢“剪子剪子”得得5分，分，“剪子剪子”赢赢“布布”得得2分。分。（1）小明和某同学玩此游戏过程中，小明赢了）小明和某同学玩此游戏过程中，小明赢了21次，得次，得108分，分，其中其中“剪子剪子”赢赢“布布”7次。聪明的同学，你能用所学的数学知识次。聪明的同学，你能用所学的数学知识求出小明求出小明“布布”赢赢“锤子锤子”、“锤子锤子”赢赢“剪子剪子”各多少次？各多少次？（2）如果小明与某同学玩了若干次，得了）

6、如果小明与某同学玩了若干次，得了30分，请你探究一下小分，请你探究一下小明各种可能的赢法，并选择其中的三种赢法填入下表。明各种可能的赢法，并选择其中的三种赢法填入下表。布布”赢赢“锤子锤子锤子锤子”赢赢“剪剪子子“剪子剪子”赢赢“布布”赢的次数赢的次数 5.在双休日，某公司决定组织在双休日，某公司决定组织48名员工到附名员工到附近一水上公园坐船游玩，公司先派一个人去了解近一水上公园坐船游玩，公司先派一个人去了解船只的租金情况，这个人看到的租金价格表如下船只的租金情况，这个人看到的租金价格表如下表，那么，怎样设计租船方案才能使所付租金最表，那么，怎样设计租船方案才能使所付租金最少（严禁超载）？少

7、（严禁超载）？船型船型 每只限载人数每只限载人数 每只租金（元）每只租金（元）大船大船53小船小船326.小王家里装修，他去商店买灯，商店柜台里小王家里装修，他去商店买灯，商店柜台里现有功率为现有功率为100瓦的白炽灯和瓦的白炽灯和40瓦的节能灯，它瓦的节能灯，它们的单价分别为们的单价分别为2元和元和32元，经了解知这两种灯元，经了解知这两种灯的照明效果和使用寿命都一样，已知小王家所的照明效果和使用寿命都一样，已知小王家所在地的电价为每度在地的电价为每度0.5元元,请问当这两种灯的使用请问当这两种灯的使用寿命超过多长时间时寿命超过多长时间时,小王选择节能灯才合算小王选择节能灯才合算?7.为了改

8、善城乡人民生产、生活环境，我市投为了改善城乡人民生产、生活环境，我市投入大量资金治理某河流污染，在城效建立了一入大量资金治理某河流污染，在城效建立了一个综合性污水处理厂。设库池中存有待处理的个综合性污水处理厂。设库池中存有待处理的污水污水a吨，从城区流入库池的污水按每小时吨，从城区流入库池的污水按每小时b吨吨的固定流量增加。如果同时开动的固定流量增加。如果同时开动2台机组需台机组需30小时处理完污水。同时开动小时处理完污水。同时开动4台机组需台机组需10小时小时处理完污水。若要求在处理完污水。若要求在5小时内将污水处理完毕，小时内将污水处理完毕，那么至少要同时开动多少台机组？那么至少要同时开动

9、多少台机组？8.市里某童装加工企业今年五月份工人每人平均加工市里某童装加工企业今年五月份工人每人平均加工童装童装150套套,最不熟练的工人加工的童装套数为平均套最不熟练的工人加工的童装套数为平均套数的数的60%.为了提高工人的劳动积极性为了提高工人的劳动积极性,按时完成外商按时完成外商订货任务订货任务,企业计划从六月份进行工资改革企业计划从六月份进行工资改革.改革后每改革后每位工人的工资分两部分位工人的工资分两部分:一部分为每人每月基本工资一部分为每人每月基本工资200元元;另一部分为每加工另一部分为每加工1套童装奖励若干元套童装奖励若干元.(1)为了保证所有工人的每月工资收入不低于市有关部为

10、了保证所有工人的每月工资收入不低于市有关部门规定的最低工资标准门规定的最低工资标准450元元,按五月份工人加工的童按五月份工人加工的童装套数计算装套数计算,工人每加工工人每加工1套童装企业至少应奖励多少套童装企业至少应奖励多少元元(精确到分精确到分)?(2)根据经营情况根据经营情况,企业决定每加工企业决定每加工1套童装奖励套童装奖励5元元,工工人小张争取六月份工资不少于人小张争取六月份工资不少于1200元元,问小张在六月问小张在六月份应至少加工多少套童装份应至少加工多少套童装?1.一台装载机每小时可装载石料一台装载机每小时可装载石料50吨吨.一堆石料的质量一堆石料的质量在在1800吨至吨至22

11、00 吨之间吨之间,那么这台装载机大约要用多长那么这台装载机大约要用多长时间才能将这堆石料装完时间才能将这堆石料装完?2.大、小盒子共装球大、小盒子共装球99个个,每个大盒装每个大盒装12,小盒装小盒装5个个,恰好装完恰好装完,盒子个数大于盒子个数大于10,问问:大小盒子各多少个大小盒子各多少个?初一英语第二学期同步串讲初一英语第二学期同步串讲 第七讲第七讲 Do you have an eraser?Do you have a soccer ball?soccer basketballbadmintonbaseballball gamestennis(racket)volleyballgol

12、fPing pong(ball)table tennis Do you have an American football/rugby?Yes,I do./No,I dont.Golf clubDo you have a golf ball?Yes,I do./No,I dont.Group workNames Do you have a?Balls you haveLucyYes,I do.basketballWhat balls do you have?I have.1.你有一个排球吗？你有一个排球吗？是的，我有。是的，我有。2.你有表兄妹吗你有表兄妹吗?不不,我没有。我没有。3.她有网球

13、拍吗？她有网球拍吗？是的，她有。是的，她有。7.咱们去踢球吧。咱们去踢球吧。Do 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.4.他有英英字典吗？他有英英字典吗？不，他没有。他有一不，他没有。他有一本英汉字典。本英汉字典。5.他们有笔记本吗？他们有笔记本吗？是的，他们有。是的，他们有。6.让我看一看。让我看一看。Does he have an English English dictiona

14、ry?No,he doesnt.He has an English Chinese dictionary?Do they have any note books?Yes,they do.Lets have a look.Does he have a tennis racket?Yes,he does./No,he doesnt.Does she have a soccer ball?Yes,she does./No,she doesnt.Does he have a basketball?Yes,he does.Do they have a puck?Yes,they do./No,they

15、dont.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.Lets play volleyball.That sounds good.Lets play barbell.BarbellThat sounds boring.Lets play bowling.That sounds interesting.Lets play baseball.That sounds d

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

17、 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)写出反义词写出反义词 dislike_ interesting _ good_ well_ easy_ lost _ day _ different _ big _ first _ on _ in front of _ this _ these _ bring _ Fill in the blanks1.A:Excuse me,_ y

18、ou _ 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 too A:Lets play volleyball.B:That _ interesting,but I _ have one.A:Well,_ you have a tennis bat?

19、B:Yes,I _.Lets go and play tennis.A:Thats a good _.soundsdontdodoidea1.Does B have an eraser?2.Is the shop open?3.What day is today?4.What can they do?No,she doesnt.No,it isnt.It is closed.Today is Friday.They go to the supermarket.Part 11.What would B like?2.How much money does B have?3.Where is he

20、r purse?4.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 a pencil-sharpener.1.Does Jim have a dictionary?2.Does Ann have a dictionary?3.Who has an English-Chinese dictionary?4.When can Li Lei give it back?Part 3No,he doesnt.L

21、ucy has one.He can give it back next Monday.No,she doesnt.close *closed 1.The shop closes at 8 pm.2.Please close the door.3.The door is closed.4.The shop is closed.5.The shop is open.borrow from 1.I borrow a book from him.2.May I borrow a pen from you?3.Dont borrow money from her.May I 1.May I come

22、in?2.May I borrow a pen from you?3.May I sit down?give back (to sb.)1.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?There is something wrong with1.There is something wrong with my TV/his pen/your computer.2.There is s

23、omething wrong with him/her/you/the boy.3.Whats wrong with you?4.Whats wrong with your TV?close *closed borrow from May I give back (to sb.)There is something wrong withYou are going to have a P.E class,think about some activities.Talk about them.Time _ Place _Sport _Reason _Writing Write a passage

24、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)Key points:Key points:Food Do you like bananas?Does he/she like bananas?Do you like bananas?Do you like bananas?Do you like oranges?Yes,I do.No,I dont.Does

25、 he like apples?Yes,he does.No,he doesnt.Does she like peaches?Yes,she does.No,she doesnt.Do they like grapes?Yes,they do.No,they dont.I like hamburgers for breakfast.But I dont like eggs.Do your parents Do your parents like pizza?like pizza?Yes,they do.Yes,they do.No,they dont.No,they dont.Does you

26、r father Does your father like beer?like beer?Yes,he does.Yes,he does.No,he doesnt.No,he doesnt.Choose the right words.1.There are five _(tomatoes,tomato)on the table.2.The _(child,children)are in the room.3.She _(doesnt like,dont like)chicken for lunch.4.He _(likes,like)hamburgers.5.Do they_(likes,

27、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?用所给动词的适当形式填空。1.She _(not like)salad.2._you _(like)oranges?3.He _(eat)lots of healthy food every day.4.There _(be)some chicken on the plate.5.His mother_(like)ice cream

28、.6._your father _(like)eggs for breakfast?7.They_(not like)playing tennis.8.There_(be)some potatoes in the bag.9.My mother_(have)supper at home every day.10.Mr.Green_(not have)lunch at school every day.A:Do you want to go to a movie?B:Yes,I do.That sounds good.A:What kind of movies do you like?B:I l

29、ike action movies because they are exciting.And I think cartoons are interesting.A:How about thrillers?B:No.Thrillers are scary.How about you?A:I dont like thrillers,either.But I like documentaries.I think theyre instructive.Does he want to go to a movie?Yes,he does./No,he doesnt.What kind of movies does he want to see?He wants to see a comedy.What do you like to do on holidays?Why do you like?