.3.4求一次函数的关系1若两个变量x,y间的关系式可以表示成y=kx+b(k,b为常数,k不为零）的形式,称y是x的一次函数的图象是一次函数直线导入示标2我们在画函数y=2x,y=3x-1时，至少应选取几个点？为什么？前面我们学习了给定一次函数解析式，可以说出它的性质，反过来给出有关的信息，能否求出解析式呢？3问题1、求下图中直线的解析式：12解：图像是经过原点的直线，因此是正比例函数，设解析式为y=kx，把(1,2)代入，得k=2，所以解析...
17.3.1一次函数1下列问题中变量间的对应关系可用怎样的函数表示?（1）有人发现，在200C-250C时蟋蟀每分钟鸣叫次数c与温度t（单位：0C）有关，即c的值约是t的7倍与35的差；（2）一种计算成年人标准体重G（单位：千克）的方法是：以厘米为单位,量出身高h,h减去常数105，所得差是G的值;解：c与t的函数关系式为：c=7t-35解：G与h的函数关系式为：G=h--105导入示标2（3）某城市的市内电话的月收费额y（单位：元）包括：月租费22元，...
12AronRalstonisanAmericanmountain_______.ThereweremanytimeswhenAronalmostlosthislifebecause___accidents.OnApril26,2003,Hefoundhimselfinaverydangerous________whenclimbinginUtah.Onthatday,Aron’sarmwascaughtundera360-kilorockthatfellclimberofRevisionFillintheblanks.situation3onhimwhenhewasclimbingby________inthemountains.Becausehecouldnotfreehisarm,hestayedthereforfivedaysandhopedthat_________wou...
第17章函数及其图象17.4反比例函数（第2课时）反比例函数的图象和性质1学习目标1、会画出反比例函数的图象。2、经历对反比例函数图象的观察、分析、讨论、概括过程，会说出反比例函数的性质。2函数图象画法列表描点连线问题一画出反比例函数和的函数图象。y=x6y=x6学做思一：探究反比例函数图象及性质导学：类比一次函数图象作图法导做：独立完成，总结归纳注意事项3xy=x6y=x616233241.551.2616-1-6-2-3-3-1.5-2-4-5-1.2-6-1-66...
第17章函数及其图象17.4反比例函数（第2课时）反比例函数的图象和性质1学习目标1、会画出反比例函数的图象。2、经历对反比例函数图象的观察、分析、讨论、概括过程，会说出反比例函数的性质。2函数图象画法列表描点连线问题一画出反比例函数和的函数图象。y=x6y=x6学做思一：探究反比例函数图象及性质导学：类比一次函数图象作图法导做：独立完成，总结归纳注意事项3xy=x6y=x616233241.551.2616-1-6-2-3-3-1.5-2-4-5-1.2-6-1-66...
1Doyouthinkchildrenshoulddosomechoresathome?Whyorwhynot?Discussthiswithapartnerandtakenotes.ChildrenshoulddochoresbecauseChildrenshouldnotdochoresbecause2WritealettertotheSundayMailandexpressyouropinion.DearSirorMadam,Ithink/believethat________________.Iagree/disagreethat________________.Ithinkitisfair/unfairforchildrento__________________________________.Ithikhildhld/hldt3because______________...
12playsports5hangoutwithfriends6talktoparents7talktofriendstalktotheteacher8listentomusic9playcomputergames10readbooks11watchmovies12_____playsports______hangoutwithfriends______talktoparentsorotherfamilymembers______spendtimealone______playcomputergames______readbooks______watchmovies1aWhatactivitiesdoyouliketodotohelploweryourstress?Orderthem[1-8]with1beingthemostfavoritethingyoudotolowerstre...
17.3.3一次函数的性质11、一次函数的一般式。y=kx+b（k，b为常数，k≠0）导入示标2、一次函数的图象是什么？一条直线。21.掌握一次函数y＝kx＋b(k≠0)的性质。2.能根据k与b的值说出函数的有关性质。3问题1、作出以下一次函数图像学做思一：一次函数有哪些性质132xy32xy导学：1、利用描点法作出以上一次函数图形2、观察图像走势，结合解析式说明走势由谁决定？导做：独立完成，组内订对导思：归纳一次函数性质12xy...
12What’sthematterwithher?Doesshehaveafever?Doesshehaveatoothache?Whatshouldshedo?3What’sthematterwithhim?Doeshehaveafever?Doeshehaveatoothache?Doeshehaveasorethroat?Doeshehaveabackache?Whatshouldhedo?4What’sthematterwithhim?Doeshehaveafever?Doeshehaveatoothache?Doeshehaveasorethroat?Doeshehaveastomachache?Whatshouldhedo?5What’sthematter?Ihaveastomachache.Youshouldn’teatsomuchnexttime.What...
1.打扫________2.分发________3.曾经_______4.（使）变得更高兴________5.义务做某事_________________6.大打扫日______________7.想出主意（办法）____________usedtogiveoutcleanupvolunteertodosth.cheerupWritedownthephrases.comeupwithClean-UpDayHi,Tom.I’mmakingsomeplanstoworkinanoldpeople’shomethissummer.Really?Ididthatlastsummer!Watchavideoandanswerthequestions.1.Wheredidtheyvolunteertowork?2.Whatdidt...
单项选择。1.--Couldyoupleasetakecareofmydog?--______.I’mtoobusy.A.Yes,youcanB.SureC.Sorry,Ican’tC2.--Couldyouplease____hisbed?--Certainly!A.makesB.makingC.make3.--CouldIuseyourcar?--______.A.Sure,youcanB.Sorry,youcanC.Sure,IcanCA4.Couldyouhelp_____?A.makingthebedB.makethebedC.madethebedBQ1:Doyouhelpyourparentsdothechoresathome?Q2:Doyouaskyourparents’permissionfor?Q3:Doyourparentsaskyoutodoso...
WelcomeBackToSchoolUnit1What’sthematter?SingasongLet’slearnthepartsofthebody.eararmhandlegfoot/feetheadeyenosemouthtooth/teethfacestomachbackWhereishisneck?headhandarmfingerkneefootneckshoulderstomachwrist手腕waist腰toe脚趾elbow肘legback1a.Lookatthepicture.Writethecorrectletter[a-m]foreachpartofthebody.___arm___back___ear___eye___foot___hand____head___leg___mouth____neck___nose___stomach____t...
bandagen.绷带v.用绷带包扎Hermotherisverysick.她母亲病得很厉害。sickadj.生病的；有病的kneen.膝盖nosebleedn.鼻出血Fishcannotbreatheoutofwater.鱼离开水就不能呼吸。breathev.呼吸sunburnedadj.晒伤的climbern.登山者accidentn.（交通）事故意外遭遇rockn.岩石knifen.刀bloodn.血controln.v.限制；约束；管理spiritn.勇气；意志Didtheseaccidentshappentoyou?Whentheyhappen,whatshouldyoudo?gethitontheheadcutyourfinge...
Unit1What’sthematter?A:What’sthematterwithyou?B:Ihaveasorethroat.Shehasatoothache.What’sthematterwithher?Shehasaheadache.What’sthematterwithher?Shehasafever.What’sthematterwithher?headachehaveatoothachesorehurtsthematterLet’splay.What’sthematter?Ihaveafever.Answerthequestions:1.what’sthematter?Ihaveasorethroat.Ihaveasoreback.Ihaveaheadache.Ihaveafever.2.WhatdoIdo?Seethedoctor;Takesomeme...
What’sthematterwiththeboy?=What’swrongwiththeboy?Hehastoomuchhomeworktodo.Doeshelikeplayingfootball?Yes,hedoes.Buthedoesn’thaveanyfreetimetodothingshelikes.Topic:Growingpains(成长的烦恼)Whatischildhoodlike?Childhood(童年)Doyoufeelhappytoday?schoollifeIfyouareill,youshouldIfyouarethirsty,YoushouldIftheroomisdirty,youshouldIfyoudon’tknowtheway,youshouldIfyouaretoofat,youshouldIoftenfeelveryti...
1.makesth.clear(同义词)___________2.talk(同义词)_______________3.notallow(同义词)______________4.worried(同义词)______________5.getalongwith(同义词)____________6.communicate（名词）_____________比较级一、按要求写出下列词汇或词组getonwithcommunicateexplainrefusenervouscommunicationolder/elderReadthearticleagainandfillintheblanks.1.SadandThirteenhassome_________.Hecan’t__________hisfamily.Hispar...
BenSmithisa_________man.Hehasmany__________inhislife.Hecan’t_____his_____orlegswell.Somenormalthingslikeansweringthetelephone,________andclosingthedoors,or________thingsaredifficultforFillintheblankswiththeproperwords.disableddifficultiesusearmsopeningcarryinghim.But“Lucky”,thedog-helper,makes__________tohislife.Luckyisafantasticdog.Itisvery______and___________manyEnglishwords.Itcanunderstan...
MarioandMary_______severalhourseachweek______others.Mariowants_____ananimaldoctor.He_________atananimalhospital.Hewants_______moreabout______careforanimals.Completethesentences.howtotohelpgiveuptobetolearnvolunteersCanyoutellsomethingaboutMariotous?Maryisabooklover.Shecouldreadbyherself_________offour.Lastyear,shedecided________foravolunteerafter-school_______program.Marystillworksthereonceawee...
1.IhavetostudytoomuchsoIdon’tgetenoughsleep.Whydon’tyougocampingwithyourfriendsthisweekend?2.IhavetoomuchhomeworksoIdon’thaveanyfreetimetodothingsIlike.Whydon’tyougotosleepearlierthisevening?Problemsandadvice:4.Ihavetoomanyafter-schoolclasses.5.Igotintoafightwithmybestfriend.3.Myparentsdon’tallowmetohangoutwithmyfriends.Whynotreadsomeinterestingbooksathome?Whydon’tyoutalkaboutitwithyourpa...
Whatdoyouoftendoonweekends?Doyouoftenhelpyourparentsdohousework?Whatkindofhouseworkdoyouoftendo?Whatchoresdoyouoftendo?A:Whatchoresdoeshedoeveryday?B:Heeveryday.dothedishes洗餐具foldtheclothes叠衣服watertheplant浇花makethebed整理床铺sweepthefloor扫地washthecar洗车takeouttherubbish倒垃圾A:Whatchoresdoeshedoeveryday?B:Heeveryday.lookaftermylittlebrother,cook\makedinnerwashthecarwashtheclothesgosh...
