高中教案教案

BritishandAmericanEnglish教案1。

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Module1BritishandAmericanEnglish（ReadingandSpeaking）

Module1BritishandAmericanEnglish（ReadingandSpeaking）

Step1Lead-in.
theteacherssays:
Asyouknow,Chinaisbiginsizeandfullofmanydialects.HongKongispartofChina.DoyouthinkwewillhavedifficultyinunderstandingpeoplefromHongKong?WhatdifficultiesinunderstandingdoyouthinkpeoplefromHongKongwillhavewhentheyareinBeijing?DopeoplefromShanghaisoundthesameasthosefromXi’an?WhataboutChinesecharacters?DoyouthinkpeoplefromdifferentregionsofChinahavedifficultyinunderstandingChinesecharacters?WhataboutBritainEnglishandAmericanEnglish?Doyouthinktheyarequitedifferent?Canpeoplefromthetwocountriesunderstandeachother?
Step2Finishactivity2.
ReadthepassageandfindwaysinwhichBritishandAmericanEnglisharedifferent.Theansweris:vocabularyspellinggrammarandpronunciation.
Step3Readthefirstpartandfindoutthetopicsentence
Thefirstandmostobviouswayisinthevocabulary.
Whatistheexample?Americansdriveautomobilesdownfreewaysandfillupwithgas.TheBritishdrivecarsalongmotorwaysandfillupwithpetrol.Asatourist,youwillneedtousetheundergroundinLondonorthesubwayinNewYork,ormaybeyouwillprefertogetaroundthetownbytaxi(British)orcab(American).
Letthestudentscomparethedifferencesinvocabularyandfillintheblanks.
Step4Thesecondpartofthepassage.
Americansuseaflashlight,whilefortheBritish,it’satorch.TheBritishqueueup;Americanstandinline.Sometimesthesamewordhasaslightlydifferentmeaning,whichcanbeconfusing.Chips,forexample,arepiecesofhotfriespotatoinBritain;inthestateschipsaresoldinpackets.TheBritishcallthesecrisps.ThechipstheBritishknowandloveareFrenchfriesontheothersideoftheAtlantic.
Themainideaofthisparagraph:Sometimesthesamewordhasaslightlydifferentmeaning,whichcanbeconfusing.
Step5Thethirdpart
thetopicsentenceis:thereareafewdifferencesingrammar.Accordingtothetextsandtellussomeexample.
TheBritishsay:Haveyougot…?Myfriendhasjustarrived.intheteamattheweekendI’llseeyouonMonday.
Americanssay:Doyouhave…?Myfriendjustarrived.ontheteamontheweekend.I’llseeyouMonday
Step6Thefourthpart
Thedifferenceisspelling,suchascenter,color,andprogram(AmericanEnglish)centre,colour,andprogrammes(BritishEnglish)
Whatdoesthesentencemean?
TheBritishandtheAmericansaretwonationsdividedbyacommonlanguage.英國(guó)和美國(guó)是被同一種語(yǔ)言分開(kāi)的兩個(gè)民族。
Step7Thefifthpart
Whatisthemainideaofthefirstparagraphofthispart?
ItsaysthetwovarietiesofEnglisharemovingcloser.
Whatisthereason?
ThereasonisthatformorethanacenturycommunicationacrosstheAtlantichavedevelopedsteadily.
WilltherebemorethantwovarietiesofEnglish?Notjusttwomainvarieties.
Step8Listentothetape.
Step9completethesentenceswiththecorrectwordsorphrases.
1.Thereare______differencesbetweenAmericanandBritishvarietiesofEnglish.
A.noB.afewC.lotsof
2.Americans________understandwhattheBritisharesaying.
A.sometimesB.usuallyC.never
3.Thereare_________differencesbetweenBritishandAmericangrammar.
A.noB.manyC.notmany
4.Americanspellingis_____Britishspelling.
A.thesameasB.simplerthanC.harderthan
5.ForaLondoner,anAmericanaccentmaybeeasiertounderstandthan_______.
A.aChineseaccentB.someBritishaccentsC.aCNNnewsreader.
6.TelevisionandtheInternethavemadeit______fortheBritishandAmericanstounderstandeachother.
A.harderB.easierC.impossible
thekey:1.B2.B3.C4.B5.B6.B
Step10listentotherecordingofaprogramofBBCandVOA.LetstudentsjudgethespeakerisBritishorAmerican.
Step11MatchtheBritishandAmericanwordsinthebox.
apartmentautumnelevatorfallfirstfloorflashlightflatgarbagegasgroundfloorholidayliftstandinlinelorrypavementpetrolqueueuprubbishsidewalktorchtruckvacation
BritishEnglish:flatautumnliftgroundfloortorchrubbishpetrolholidayqueueuplorrypavement
AmericanEnglish:apartmentfallelevatorfirstfloorflashlightgarbagegasvacationstandinlinetrucksidewalk
RewritethesentencesusingBritishwords.
1.Wereallylikegoingonvacationinthefall.
2.Youdon’tneedtotaketheelevator.Ourapartmentinonthefirstfloor.
3.Didyouseethattruckcomeoutofthegasstation?
4.Passmeaflashlight,Eddie.I’velostmywallet.
Thekey:
1.Welikegoingonholidayintheautumnverymuch.
2.Youdon’tneedtousethelift.Ourflatisonthegroundfloor.
3.Didyouseethatlorrycomeoutofthepetrolstation?
4.Passmeatorch,Eddie.I’velostmywallet.
Step12Homework.Recitethemainimportantsentencesinthepassage.

BritishandAmericanEnglish教案

高二英語(yǔ)必修五Module1BritishandAmericanEnglish導(dǎo)學(xué)案
ModuleSummary—單元小結(jié)
學(xué)習(xí)目標(biāo)Learingaims:①Understandsomesentencesorparagraphscontainswordsandstructureswehavelearnedinthismodule.
②Identifysometenses:ThePresentIndefinite,ThePresentContinuous,ThePresentPerfectandsoon.
學(xué)習(xí)重點(diǎn)LearningImportant：
①Expressthemeaningusingallkindsoftenses.Forexaplethe
PresentIndefinite.
②Analyse,intergradethelanguagematerialsbywaysofscaningtoacquiretheusefulinformation.
知識(shí)鏈接Knowledgelinks:OtherusagesofthePresentContinuous:
①一些非延續(xù)性動(dòng)作，可用現(xiàn)在進(jìn)行時(shí)表示很快將發(fā)生的事情。
Thebusisstopping.(表示漸漸停下來(lái)，很快將全部停止)
②現(xiàn)在進(jìn)行時(shí)可以表示按計(jì)劃、安排將要發(fā)生的動(dòng)作。
We’regoingtoLondonthedayaftertomorrow.
學(xué)法指導(dǎo)Guidanceoflearning:Knowaboutthebasicusagesofverbinthetext.
探究過(guò)程Processesofexploring:
PARTⅠSimplesentencescorrection(單句改錯(cuò))（知識(shí)應(yīng)用B級(jí)）
1.Thanksforyourhelp,wegotoverthesedifficulties.
2.Allthestudentswereinfavorwiththereform.
3.QiBaishiisreferredasthePicassoofChina.
4.Thisdictionaryisbelongedtome.
5.Howdoyouliketheideapresentingbytheheadteacher.
6.Youmayfinditnecessarytofinishtheworkaheadoftime.
7.Doyouknowwhetherthisprogramisintheair?
8.Theoldmangotusedtolivealone.
9.Theyoungcouplemadeafusstotheirpetdog.
10.Howareyougettingonyourjobhere?
PARTⅡUseproperprepositionoradverbtocompletethesentences.（B級(jí)）
1.Thetwinshaveeverythingincommonwitheachother,_______character.
2.Thebasketisfilled_______flowers.
3.Itispolitetoqueue_________whileyouwaitatthestation.
4.Compared________lastyear,hemadegreaterprogressthisyear.
5.Hedidn’tgotoHuanggangMiddleSchool.________heleftforBeijingNo.4Middleschool.
6.Whathesaidled_________thisquarrel.
7.Thelightwillbeon________theflickofswitch.
8.Goodsleepinghasagoodeffect_________yourhealth.
9.Itishelpfulforchildrentpresenttheirthoughts__________theirparents.
10.NoahWebstergraduated__________YaleUniversity.
PARTⅢChoosethebestwaytofillintheblanks.(C級(jí))
1.Doyouburncoal_________gasforcookinginwinter?
2.Don’tblamehimforbreakingthatvase,__________heisachild.
3.Thegarden__________apathisreallyabigone.
4.Heisthebestplayer_________withoutquestion.
5.Ipickedupawallet__________moneyandturneditin.
6.Thereisanewstore________ofthestreet.
7.Rememberwearefriends_________youare.
8.Thestudentsarenow_________togettheirnewbooks.
當(dāng)堂檢測(cè)Haveain-classtest
●MultipleChoice（C級(jí)）
1.Ourancestors(祖先)celebrated______birthof_____childbygivingredeggs.
A.the,aB.the,theC./,aD./,the
2.–-Ijusthearthattheticketsfortonight’sshowhavebeensoldout.
--Oh,no!_________.
A.Idon’tmindB.Iknewitalready
C.IwaslookingforwardtothatD.It’snotatallinteresting
3._________wasonceregardedasimpossibleisverycommontoday.
A.ThatB.WhichC.WhatD.Who
4.Wheretherearesmallchildrenaround,itisnecessarytoputbottlesof
pillsoutof___________.
A.handB.reachC.holdD.place
5.I__________himtotakethejob,butIdidn’tsucceed.
A.persuadedB.triedtoadvise
C.didmybesttomakeD.triedtopersuade
6.Chinaislargerthan___________countryinAfrica.
A.anyotherB.anyC.otherD.theother
7.Americanseat________astheyactuallyneedeveryday.
A.twiceproteinasmuchB.proteinasmuchtwice
C.proteinastwicemuchD.twiceasmuchprotein
8.__________atthedoorbeforeenteringplease.
A.KnockB.ToknockC.knockingD.Knocked
9.Annawasreadingapieceofsciencefiction,completely_________tothe
outsideworld.
A.havingbeenlostB.tobelostC.lostD.losing
10.Look!There_________ahillinfrontofthevillageinthepainting.
A.standsB.beC.livesD.lies
●ReadingField（能力提升D級(jí)）
IfAmericancustomsseemstrange,rememberthatAmericansfeelthesamewaywhentheyvisitanothercountry,peoplelivingindifferentculturesdomanydailythingsdifferentlyfromoneanother.Whatadull(notinterestingorboring)theworldwouldbeifthiswerenottrue!
Somedifferencesaresmall,andonesoonbecomesusedtothem.Forexample,manypeoplefinditstrangethatAmericansmovefromplacetoplacesooften.Borninonecity,theymayattendschoolinasecond,enterbusinessinathird,andperhapsmoveseveraltimesduringtheirlives.Today,mostAmericansfullyexpectandacceptthefactthattheywillmovefrequently.
However,housesareofgreatinteresttoAmericans.Theyspendalotoftimethinking,readingandtalkingabouttheirhomesandhowtoimprovethem.Theyalsoenjoylookingatotherpeople’shouses,sincetheywouldenjoyvisitingandexaminingahouseinanothercountry,theymaysupposethatyouwillprobablyhavethesamedesire(strongwish)whenyouvisittheUnitedStates.SodonotbesurprisedwhenyouvisitanAmericanfamilyandareshowneveryroominthehousebesidesthebathroomandkitchen.
1.Thefirstparagraphsuggeststhat___.
A.onlyAmericancustomsprovetobestrange
B.customsaredifferentindifferenttimes
C.customsaredifferentfromcountrytocountry
D.Americansfeeluneasywhentheyvisitanothercountry
『分析』

2.Accordingtothepassage,theworldwouldbeterriblydullif___.
A.peoplelivingindifferentcountriesdidalotofthingsinthesameway
B.peoplelininginvariousregionsintheworlddidafewdailythingsin
thesameway
C.thepeopleallovertheworldspokethesamelanguage
D.mostoftheworldpeoplediddailythingsdifferentlyfromoneanother
『分析』

3.MostAmericansthinkitnormalthat___.
A.theworldisnotdullB.theywillmovefrequently
C.theydomanydailythingsdifferentlyfromoneanother
D.customsaredifferentfromcountrytocountry
『分析』

4.WhichofthefollowingstatementisNOTtrue?
A.Americansperhapsmoveseveraltimesduringtheirlives
B.Americansenjoyvisitingothers’houses
C.IttakesAmericansmuchtimetothink,readandtalkabouttheirhousesandhowtoperfectthem
D.YouareshowingalltheroomsinthehousesexceptthebathroomwhenyouvisitanAmericanfamily
『分析』
總結(jié)Summary：
Introspection:________________________________________________________

BritishandAmericanEnglish教學(xué)案

BritishandAmericanEnglish教學(xué)案
Module1BritishandAmericanEnglish
PeriodOne
Step1.Lead-in
1.Doyouliketravelling?
Haveyoueverbeentotheothercountries?
WhatdoyouknowaboutBritainAmerican?
(Askstudentstospeakoutasmanyastheycan)
2.What’sthedifferencebetweentheUKandtheUSA?(TheteachercanshowtheSssomepicture.)
(AsktheSstowritedownthedifferencesandcheckwiththeirpartner)
Step2.Warming-up(Introduction)
1.ReadtwoEnglishlettersanddecidewhichiswrittenbyanAmerican.
2.Comprehendquotationsaboutthedifferences.
Step3.Fastreading
1.Helpstudentstograspthemainideaofthetextbydoingthetask.
2.ReadthetitlesandthefirstsentencesofeachparagraphandfindfourwaysinwhichBritishandAmericanEnglisharedifferent.
Step4.Readingfordetailedinformation
1.Readpara.1andfillintheform.(Theformisonthenextpage)
2.Dosometrueorfalsequestionsandchecksomedetailedinformation
(1)There’realotofdifferenceingrammarbetweenBritishandAmericanEnglish.
(2)Spellingisthefirstandmostobviousdifferencebetweenthetwo.
(3)Britishpeoplesay”writeme”and”ontheteam”.
(4There’snotmuchvariationinlanguagewithinthecountry.
(5)TelevisionandInternethavemadeiteasierfortheBritishandAmericanstounderstandeachother.
(6)Inthefuture,there’llbeonlyonekindofEnglish.
3.Beautifulsentences:tolearnsomeimportantstructures
Step5.Practise
1.fillintheblankswithsomekeywords
There’refourwaysinwhichBritishandAmericanEnglish________fromeachother.Thefirstandmost________wayisinthevocabulary.Ingrammarthere’reafew__________.TheBritishsayHaveyougot…?______AmericanspreferDoyouhave…?TheBritishuseprepositions______Americanssometimes______them.Theothertwoareasinwhichthetwo_________aredifferentarespellingandpronunciation.Butformorethanacenturycommunicationshavedeveloped_______.ThankstosatelliteTVandtheInternet,ithasbeenpossibletolistentomanyEnglishmenatthe______ofaswitch.Soexpertsbelievethatthetwoaremoving______.
3.Retellthetextaccordingtoit.
4.Discussion
Whichofthefollowingdoyouthinkisthebestlanguageinthefuture?Why?
BritishEnglish,AmericanEnglish,worldEnglish,Chinese
Step6.Vocabulary
Task:RewritethesentencesusingtheBritishwords.
1.MatchtheBritishandAmericanwordsandphasesinthebox..
2.Askthestudentstoreadtheiranswersoutandcomparewiththeirpartners.
3.RewritethesentencesusingBritishwords..
4.Summarize:andPractice:
Step7.Openwork
TrytofindinformationaboutChineseandprepareareporttointroducethefollowingthreeaspectsofChinese.
1.Thewritingsystem
2.VarietiesofChinese
3.Languagetoday

PeriodTwo

Step1.Grammar1
Task1:Findouttheusesoftheverbs.Rulesofthetenses.
Activity1.Matchthesentenceswiththecorrectmeanings.
Activity2.completethesentenceswiththecorrectformoftheverbs.
Activity3.Telltheusesoftheverbs.Rulesofthetenses
(1)Completethesentencesinyourownwords.
(2)Observe,compareandfindouttherules.
：I____ping-pangquitewell,butIhaven’thadtimetoplaysincethenewyear.
A.willplayB.haveplayedC.playedD.play
：—You’redrinkingtoomuch.
—Onlyathome.Noone________mebutyou.
A.isseeingB.hadseenC.seesD.saw
2.Canyouexplainthefollowinguseoftenses.
presentsimpletense
presentcontinuoustense
presentperfecttense
futuretense
Step2.Function
Task:Givingreasons
Directions:
1.Underlinethewordswhichintroducereasons.
2.Answerthequestions.
3.Completethesentenceswithbecausesinceasornowthat.
Step3.Test
Completethemessageswiththecorrectformoftheverbs.
HiMum,
Hopeyou__________(be)well.I________(have)alovelytimeinNewYork.Tomorrowwe___________(go)toseethefireworks.It’shardtounderstandtheaccenthere,butit________(get)easier,asI_________(be)herefor3weeks.Nextweekwe_________(fly)toMexicowherethey________(speak)noEnglishatall,justSpanish.I__________(Spend)nearlyallthemoneyyougaveme!
Love,XiaoPing
Practice:Makeyourownsentencescreatively,usingbecause,since,asornowthat.
Step4.EverydayEnglish
Task:Usethephrasesfreely.
1.Remindthestudentsoftheexpressionsthatwehavelearned.
2.Askthestudentstorememberthem.
3.Speakingpractice:
Haveaconversationusingsomeofthephrases.
Step5.Homework
Haveagoodrevisionoftoday’slessonandmakesentenceswiththetensesandvariouswordstoexpressreasons.It’sbettertodosomerelatedexercises.

PeriodThree

Step1.Warmingup:Talkabouttheproblemsexchangestudentshave.
understandingthelanguage
gettingonwithpeople
food
differentschoolsubjectsandtimetable
localcustoms
climate
Step2.Presentation
Listentothetargetlanguage:
VocabularyandListening–2.Listeningtothe1stpart(5m)Listenandcompletethepassage.
Hello,andwelcometotoday’seditionofIntheair.Asyouknow,everyweekonthisprogrammewediscussanaspectofthewaywe__1____now,andtoday’stopicisthelanguagewe____2____-English.Sothat’ssomethingwhichaffectsusall.Thequestionis,what’sgoingto__3___tothewaywespeakEnglishinthefuture?AreweallgoingtospeaklikeAmericans?OrwillBritishEnglishcontinueto_4___?Lateronwe’regoingto_5___youtophoneinand__6___yourviewsonthesubject,butfirstwe’regoingto__7___totwoyoungpeople,oneAmerican,andoneBritish,whohavespenttimeonaneducationalexchangeintheother’scountry.We__8___theywillhavesomeinterestingideasonthesubject.
Playagaintoanswerthequesrions.Makenotesifnecessary.(Activity4)
Havethestudentscomparetheanswerinpairs.
Playthetapeathirdtimeforafinalcheck.
Checknoteswiththeteacher.
Step3.SpeakingandWriting
1.Reviewthecontentofthetextbyaskingsomequestions.
InhowmanywaysareAmericanEnglishandBritishEnglishdifferent?
Whichisthefirstandmostobviousway?
......
2.Thegreatdebate
Workingroups.Readthenotesanddecidewhichisthebestvarietyoflanguageinthefuture.
Giveyourreasons.
BritishEnglish,AmericanEnglish,WorldEnglishChinese
3.Writing
WriteapassageaboutyourfavouritechoiceandthereasonsinthediscussionaboveorwritethreemoreparagraghsabouttheChineselanguage(activity4onP8).
Step4.Homework
GetmoreinformationaboutthelanguagethroughtheInternetorothermethodtosupportyourcomposition.

PeriodFour

Step1.Culturalcorner
1.Readthetextquicklyandmatcheachparagraghwiththecorrectmainidea.
2.Appreciateandanalyze2or3longsentences.
Step2.ModuleFile
1.Review:Gooverthevocabularyandgrammarfocusinthemodulefile.
2.Put“?”nexttothethingsyouarenotsureof.Thensolvetheproblemsingroupsorraiseyourquestions.
3.Dosomeexercisestoconsolidatewhatwelearnedinthismodule.
Step3.Homework
Recitethephrasesandsentencepatterns.

Period3:Grammar—Reviewofverbforms(1)
Goals
●ToreviewPresentsimple,presentcontinuous,presentperfectandfuturereference;forandsincewithpresentperfect
Procedures
▇ReviewingPresentsimple,presentcontinuous,presentperfect
ActiveTenses
SimplePresent
PresentActionorConditionGeneralTruthsNon-action;HabitualActionFutureTime
Ihearyou.
Herecomesthebus.TherearethirtydaysinSeptember.Ilikemusic.
IrunonTuesdaysandSundays.Thetrainleavesat4:00p.m.
PresentProgressive
ActivityinProgressVerbsofPerception
IamplayingsoccernowHeisfeelingsad
PresentPerfect
WithverbsofstatethatbegininthepastandleaduptoandincludethepresentToexpresshabitualorcontinuedactionWitheventsoccurringatanindefinitedorunspecifiedtimeinthepast--withever,never,before
THEPASSIVETENSES
Simplepresent
active:passive:
Thecompanyshipsthecomputerstomanyforeigncountries.Computersareshippedtomanyforeigncountries.
PresentProgressive
active:passive:
Thechefispreparingthefood.Thefoodisbeingprepared.
PresentPerfect
active:passive:
Someonehasmadethearrangementsforus.Thearrangementshavebeenmadeforus.
■UsingthePresentPerfectTense:FORorSINCE?
WeusePresentPerfecttensetotalkaboutactionwhichstartedinthepastandcontinuesuptothepresent.
Examples
Ihavehadthiscomputerforaboutayear.
Howlonghaveyoubeenatthisschool?
IhaventseenJuliasinceSeptember.
Tip!ForotherusesofthePresentPerfecttense,seethePresentPerfectTense-WhenToUse.
Weuseforwithaperiodoftime,forexample:afewdays,halfanhour,twoyears.Weusesincewiththetimewhentheactionstarted,forexample:lastyear,June8,Imetyou.
Eachofthesepresentperfectsentencescontainsatimeexpression.Eachtimeexpressionisalengthoftime(whichrequiresFOR)orastartingtime(whichrequiresSINCE).
1Mayahasbeenaprofessional________1989.
2Sofar,ithasrained________fivehours.
3Ihaventbeensnowboarding________lastwinter.
4Johasbeenastudenthere________March.
5ThebeaverhasbeenanemblemofCanada________manyyears.
6CougarshavealmostdisappearedfromtheVictoriaarea________humanssettledhere.
7Maryhaskeptadiary________shewastenyearsold.
8FirstNationspeopleinBritishColumbiahavetoldstoriesabouttheeagle________hundredsofyears.
9TheCanadiantwo-dollarcoin(ortoonie)hasbeenincirculation________1996.
10Theyvebeenmarried________twenty-fiveyears.
11Ihaventphonedhome______Christmas.
12Wevebeenhere__________nineoclock.
13IhaveworkedforInternationalHouse__________morethaneightyears.
14Ihaventvisitedmyhometown_________Ileftschool.
15Ihaventbeentothecinema__________ages.
16Ihavestudiednon-stop_________9.15.
17Ihavehadadrivinglicence_________Iwaseighteen.
18Shehasnthadadayoff_________1999.
19JohanhasbeeninEngland__________morethantwoweeksnow.
20Peterhasbeenmybestfriend_________wewerenine.
■Closingdownbydecidingifyouneedfororsincewiththesetimeexpressions.
---for/sincelastweekend
---for/sincetenseconds
---for/sinceChristmasEve
---for/sinceadecade
---for/sinceIfinishedschool
---for/sinceacoupleofdays
---for/sincemybirthday
---for/sincealongtime
---for/sincetencenturies
---for/sincethe70s
---for/sinceIwasaboy
---for/sinceAugust
---for/sincethelastmonth
---for/sincefifteenyears
---for/sincetenseconds
---for/sinceChristmasEve
---for/sinceadecade
---for/sinceIfinishedschool
---for/sinceacoupleofdays
---for/sincemybirthday
---for/sincealongtime
---for/sincetencenturies
---for/sincethe70s
---for/sinceIwasaboy
---for/sinceAugust
---for/sincethelastmonth
---for/sincefifteenyears
---for/sincetheaccident
---for/sincethen
---for/sinceweboughtthishouse
---for/sincelastmonth
---for/sinceamillennium
---for/sinceImetyou

對(duì)數(shù)（1）教案蘇教版必修1

一名優(yōu)秀的教師在教學(xué)方面無(wú)論做什么事都有計(jì)劃和準(zhǔn)備，作為教師就要在上課前做好適合自己的教案。教案可以讓學(xué)生們能夠在上課時(shí)充分理解所教內(nèi)容，讓教師能夠快速的解決各種教學(xué)問(wèn)題。那么如何寫(xiě)好我們的教案呢？以下是小編為大家收集的“對(duì)數(shù)（1）教案蘇教版必修1”歡迎大家閱讀，希望對(duì)大家有所幫助。

3.2.1對(duì)數(shù)（1）
教學(xué)目標(biāo)：
1．理解對(duì)數(shù)的概念；
2．能夠進(jìn)行對(duì)數(shù)式與指數(shù)式的互化；
3．會(huì)根據(jù)對(duì)數(shù)的概念求一些特殊的對(duì)數(shù)式的值．

教學(xué)重點(diǎn)：
對(duì)數(shù)的概念，對(duì)數(shù)式與指數(shù)式的相互轉(zhuǎn)化，并求一些特殊的對(duì)數(shù)式的值；
教學(xué)難點(diǎn)：
對(duì)數(shù)概念的引入與理解．

教學(xué)過(guò)程：
一、情境創(chuàng)設(shè)
假設(shè)2005年我國(guó)的國(guó)民生產(chǎn)總值為a億元，如每年平均增長(zhǎng)8%，那么經(jīng)過(guò)多少年，國(guó)民生產(chǎn)總值是2005年的2倍？
根據(jù)題目列出方程：______________________．
提問(wèn)：此方程的特征是什么？已知底數(shù)和冪，求指數(shù)！
情境問(wèn)題：已知底數(shù)和指數(shù)求冪，通常用乘方運(yùn)算；而已知指數(shù)和冪，則通常用開(kāi)方運(yùn)算或分?jǐn)?shù)指數(shù)冪運(yùn)算，已知底數(shù)和冪，如何求指數(shù)呢？
二、數(shù)學(xué)建構(gòu)
1．對(duì)數(shù)的定義．
一般地，如果a(a＞0，a≠1)的b次冪等于N，即ab＝N，那么就稱b是以a為底N的對(duì)數(shù)，記作logaN，即b＝logaN．
其中，a叫作對(duì)數(shù)的底數(shù)，N叫做對(duì)數(shù)的真數(shù)．
2．對(duì)數(shù)的性質(zhì)：
（1）真數(shù)N＞0，零和負(fù)數(shù)沒(méi)有對(duì)數(shù)；
（2）loga1＝0(a＞0，a≠1)；
（3）logaa＝1(a＞0，a≠1)；
（4）a＝N(a＞0，a≠1)．
3．兩個(gè)重要對(duì)數(shù)：
（1）常用對(duì)數(shù)(commonlogarithm)：以10為底的對(duì)數(shù)lgN．
（2）自然對(duì)數(shù)(naturallogarithm)：以無(wú)理數(shù)為底的對(duì)數(shù)lnN．
三、數(shù)學(xué)應(yīng)用
例1將下列指數(shù)式改寫(xiě)成對(duì)數(shù)式．
（1）24＝16；（2）；（3）；（4）．
例2求下列各式的值．
（1）log264；（2）log832．
基礎(chǔ)練習(xí)：
log10100＝；log255＝；
log2＝；log4＝；
log33＝；logaa＝；
log31＝；loga1＝．
例3將下列對(duì)數(shù)式改寫(xiě)成指數(shù)式
（1）log5125＝3；（2）log3＝－2；（3）lga＝－1．699．
例4已知loga2＝m，loga3＝n，求a2mn的值．
練習(xí)：
1．（1）lg(lg10)＝；（2）lg(lne)＝；
（3）log6[log4(log381)]＝；（4）log3＝1，則x＝________．
2．把logx＝z改寫(xiě)成指數(shù)式是．
3．求2的值．
4．設(shè)，則滿足的x值為_(kāi)______．
5．設(shè)x＝log23，求．
四、小結(jié)
1．對(duì)數(shù)的定義：b＝logaNab＝N．
2．對(duì)數(shù)的運(yùn)算：用指數(shù)運(yùn)算進(jìn)行對(duì)數(shù)運(yùn)算．
3．對(duì)數(shù)恒等式．
4．對(duì)數(shù)的意義：對(duì)數(shù)表示一種運(yùn)算，也表示一種結(jié)果．
五、作業(yè)
課本P79習(xí)題3.2(1)1，2，3(1)～(4)．