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若将函数(x>0)的图像向右平移个单位长度后,与函数y=tan(wx的图像重合,则w的最小值为().
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为了得到函数的图像可以把函数的图像
向左平移1个单位长度
向右平移1个单位长度
向左平移2个单位长度
向右平移2个单位长度
为了得到函数的图像只需把函数的图像
向右平移
个长度单位
向左平移
个长度单位
向右平移
个长度单位
向左平移
个长度单位
若将函数y=sin2x的图象向右平移个单位长度则平移后图象的函数解析式为__________
课本P152有段文字把函数y=2x的图像分别沿y轴向上或向下平移3个单位长度就得到函数y=2x+3或
为了得到函数y=2x-3-1的图像只需把函数y=2x的图像上所有的点
向右平移3个单位长度,再向下平移1个单位长度
向左平移3个单位长度,再向下平移1个单位长度
向右平移3个单位长度,再向上平移1个单位长度
向左平移3个单位长度,再向上平移1个单位长度
.为了得到函数的图像只需把函数的图像上所有的点
向左平移3个单位长度,再向上平移1个单位长度
向右平移3个单位长度,再向上平移1个单位长度
向左平移3个单位长度,再向下平移1个单位长度
向右平移3个单位长度,再向下平移1个单位长度
函数fx=cosωx+x∈Rω>0的最小正周期为π为了得到fx的图象只需将函数gx=sinωx+的图
向左平移个单位长度
向右平移个单位长度
向左平移个单位长度
向右平移个单位长度
函数的部分图像如图所示为了得到gx=sin2x的图像则只要将fx的图像
向左平移
个单位长度
向右平移
个单位长度
向左平移
个单位长度
向右平移
个单位长度
为了得到函数y=3×x的图像可以把函数y=x的图像
向左平移3个单位长度
向右平移3个单位长度
向左平移1个单位长度
向右平移1个单位长度
为了得到函数的图像可以把函数的图像
)向左平移3个单位长度 (
)向右平移3个单位长度(
)向左平移1个单位长度 (
)向右平移1个单位长度
为了得到函数的图像可以把函数的图像
向左平移1个单位长度
向右平移1个单位长度
向左平移2个单位长度
向右平移2个单位长度
课本P152有段文字把函数y=2x的图像分别沿y轴向上或向下平移3个单位长度就得到函数y=2x+3或
函数fx=
sin(ωx+φ)(其中A.>0,|φ|<
)的图像如图所示,为了得到函数g(x)=sin2x的图像,则只需将f(x)的图像( )
A.向右平移
个长度单位
向右平移
个长度单位
向左平移
个长度单位
向左平移
个长度单位
为了得到函数的图像只需把函数的图像上所有的点
向左平移3个单位长度,再向上平移1个单位长度
向右平移3个单位长度,再向上平移1个单位长度
向左平移3个单位长度,再向下平移1个单位长度
向右平移3个单位长度,再向下平移1个单位长度
把二次函数y=ax2+bx+c的图像向左平移4个单位或向右平移1个单位后都会经过原点则二次函数图像的
(-2.5,0)
(2.5,0)
(-1.5,0)
(1.5,0)
函数的图像可由函数y=2sinx的图像至少向右平移个单位长度得到
为得到函数y=cosx+的图像只需将函数y=sinx的图像
向左平移
个长度单位
向右平移
个长度单位
向左平移
个长度单位
向右平移
个长度单位
为了得到函数的图像只需把函数的图像上所有的点
向左平移3个单位长度,再向上平移1个单位长度
向右平移3个单位长度,再向上平移1个单位长度
向左平移3个单位长度,再向下平移1个单位长度
向右平移3个单位长度,再向下平移1个单位长度
若将函数fx=sin的图像向右平移φ个单位所得图像关于y轴对称则φ的最小正值是________.
函数fx=
sin(ωx+φ)(其中A.>0,|φ|<
)的图像如图所示,为了得到函数g(x)=sin2x的图像,则只需将f(x)的图像( )
A.向右平移
个长度单位
向右平移
个长度单位
向左平移
个长度单位
向左平移
个长度单位
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DuringourtwomonthsontheroadBennettandIhadareally1experiencewithagoodhonest2andsomehelpfulmechanics. WeweredrivingeastonHighway10whenour"chickengine"lightcameon.Welimpedofan3intoLasCruces.Wehadarealcar4Bennettnursedtheearintoalocalgarage.Bythistimethecarwasmissingso5itwasshakingallover.Thiswasthe6timetoarriveatagarage—lateFridayafternoon.ServiceadviserScottwasbusy7paperworkandcustomersaswe8ourproblems.9hewasalready"tencarsbehind"hetoldustopullthecarintothegarage. Lincolnwhowelater10wasoneofthetwomotortechnicianstook11ofourcarrepairing.HeandScottandsomeothermechanicsstayedseveralhoursafterclosing12thecar. EarlythenextmorningtheshopwasofficiallyclosedonSaturdaysLincolnfinallylocatedthe13andfixediteasilywithinonly14 LaterScott15outtousthatitwasourattitudethathelped."Youdidn’tcomeintotheplacedemandingthisorthat.Youshowedan16ofourproblemsonabusyFridayafternoon.Customer’sattitudemeansalot."Hewasrightinsomewaycustomersshouldshow17andunderstandingtopeoplewho18them.19peoplewereextremelybusytheyfoundwaytoatleasttryandhelpwhentheyaremetwithpoliteness. ThepleasantexperienceIhadshowsthat20forotherpeoplecanalwayshelp. 20.
Therearetwotypesofpeopleintheworld.Althoughtheyhaveequaldegreeofhealthandwealthandothercomfortsoflifeonebecomeshappyandtheotherbecomesunhappy.Thisarisesfromthedifferentwaysinwhichtheyconsiderthingspersonseventsandtheresultingeffectsupontheirminds. Peoplewhoaretobehappyfixtheirattentionontheconvenienceofthings;thepleasantpartsofconversationthewellprepareddishesthegoodnessofthewineandthefineweather.Theyenjoyallthecheerfulthings.Thosewhoaretobeunhappythinkandspeakonlyoftheoppositethings.Thereforetheyarecontinuallydissatisfied.Bytheirremarkstheysourthepleasureofsocietyoffendhurtmanypeopleandmakethemselvesdisagreeableeverywhere.Ifthisturnofmindwasfoundedinnaturesuchunhappypersonswouldbethemoretobepitied.Theintentionofcriticizingandbeingdislikedisperhapstakenupbyimitation.Itgrowsintoahabitunknowntoitspossessors.Thehabitmaybestrongbutitmaybecuredwhenthosewhohaveitrealizeitsbadeffectsontheirinterestsandtastes.Ihopethislittlewarningmayheofservicetothemandhelpthemchangethishabit. Althoughinfactitischieflyanactoftheimaginationithasseriousresultsinlifesinceitbringsondeepsorrowandbadluck.Thosepeopleoffendmanyothers;nobodylovesthemandnoonetreatsthemwithmorethanthemostcommonpolitenessandrespect.Thisfrequentlyputstheminbadtemperanddrawsthemintoarguments.Iftheyaimatgettingsomeadvantagesinsocialpositionorfortunenobodywishesthemsuccess.Norwillanyonestartasteporspeakawordtofavortheirhopes.Iftheybringonthemselvespublicobjectionsnoonewilldefendorexcusethemandmanywilljointocriticizetheirwrongdoings.Theseshouldchangethisbadhabitandbepleasedwithwhatispleasingwithoutworryingneedlesslyaboutthemselvesandothers.Iftheydonotitwillbegoodforotherstoavoidanycontactwiththem.Otherwiseitcanbedisagreeableandsometimesveryinconvenientespeciallywhenonebecomesmixedupintheirquarrels. Wecanconcludefromthepassagethat.
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Thatshehadn'tkepther______onherworkresultedinthefailure.
IndustrialpollutionisnotonlyaproblemforthecountriesofEuropeandNorthAmericabutalsoanextremelyseriousprobleminsomedevelopingcountries.Forthesecountrieseconomicgrowthisaveryimportantaim.Theywanttointroduceindustriesandsotheyputfewcontrolsontheindustrieswhichcausepollution.Cubataoanindustrialtownof85000peopleinBrazilisanexampleoftheconnectionbetweenindustrialdevelopmentandpollution.In1954Cubataohadnoindustry.Todayithasmorethantwentylargefactorieswhichproducemanypollutants.Thepeopleofthetownaresufferingfromthepoisonousmatterintheirenvironmentandthebadeffectscanbeclearlyseen.Birthshortcomingsareextremelycommon.AmongchildrenandadultslungproblemsaresometimestwelvetimesmorecommoninCubataothaninotherplaces.ItistruethatBrazillikemanyothercountrieshaslawsagainstpollutionbuttheselawsarenotenforcedstrictlyenough.Itischeaperforcompaniestotakenonoticeofthelawsandpaythefinesthantobuytheexpensiveequipmentthatwillreducethepollution.Itisclearthereforethateconomicgrowthismoreimportanttothegovernmentthantothehealthoftheworkers.HowevertheresponsibilitydoesnotcompletelyliewiththeBraziliangovernment.TheexampleofCubataoshowsthatinternationalcompaniesarenotactinginaresponsiblewayeither.AnumberofthefactoriesinthetownareownedbylargecompaniesfromFranceItalyandtheUS.TheyaredoingthingsinBrazilthattheywouldnotbeabletodoathome.Iftheycausedthesameamountofpollutionathometheywouldbeseverelypunishedorevenputoutofbusiness.Whatistheauthor’spurposeintakingCubataoasanexample
HowtoprotectchildrenWebfansfromunsuitablematerialon-linewhileencouragingthemtousetheInternethaslongbeendiscussedintheUS.ForsomeparentstheInternetcanseemlikeajunglefilledwithdangerfortheirchildren.ButjunglescontainwondersaswellasdangersandwithgoodguidessomeeducationandafewprecautionsthewildsoftheInternetcanbesafelynavigated.Kidshavetobeon-line.Ifwetellourkidstheycan’thaveaccesstotheInternetwe’recuttingthemofffromtheirfuturesaidanexpert.Mostkidshavestartedtousesearchengines.ManyofthemaregreatforfindingtonsofinterestingInternetsitesandtheycanalsolocateplaceswhereyoumightnotwantyourkidstogo.Therearesearchenginesdesignedjustforkids.Acertainsoftwarecontainsonlysitesthathavebeenselectedassafe.Themostpopularwaytolimitaccesswouldbetousewhatisknownasacontentscreener.Butthiscan’tbewhollyreliableandthebestthingparentscandoistotalktotheirkidsandletthemknowwhatisOKornotOKtoseeordoontheInternet.AnotherwayisthatmumordadisnearbywhenthechildissurfingtheInternet.Afewothertips·Don’tputthePCinachild’sroombutkeepitinanareawheremumordadcankeepaneyeonthings.ThatalsomakestheInternetmoreofafamilyactivity.·Askyourchildwhatheorshehasbeendoingandaboutanyfriendstheymakeon-line.·Tellyourchildnottogiveon-linestrangerspersonalinformationespeciallylikeaddressandphonenumber.·Andtellyourchildrennevertotalktoanyonetheymeeton-lineoverthephonesendthemanythingacceptanythingfromthemoragreetomeetwiththemunlessyougoalong.Accordingtothepassagewecaninferthat______.
发音不同的是
It’snoteasytobeanastronaut’sson.Everybodyexpectsyoutobespecialorperfect.Ioftenwonderhowmyfathereverhadasonlikeme.Imeanhe’ssospecialandsogoodateverythinghedoes.Eveninmiddleschoolhewasclasspresidentandcaptainofthefootballteam.WelltobehonestIoftendreamaboutbeingsomekindofheroordoingsomethingspecial-likesavingachildfromaburningbuildingordiscoveringanewstar.IwasdaydreamingatschoolonemorningwhenmyteachersaidtherewouldbeaFather’sDaywritingcompetitionforthewholeschool.Ihopewehaveawinnerrighthereinmyclass.WhenIgothomeIstartedtothinkaboutwhattowrite.Myfatherisanastronaut.NoIwouldn’tstartlikethat.Thatwasthewayotherssawhim.HowdidIseemyfatherHmm.IsawhimsittingwithmeinthedarkwhenIhadaterribledream.IrememberedhowhehuggedmeforhourswhenmydogSpottywaskilledbyacar.YesthesewerethethingsIwasgoingtowrite.Tomehewasn’tjustaworld-famousastronaut.Hewasmydad.MyparentsandIwenttoschoolThursdaynight.Thereweresomanypeopleinthebighall!MydadlookedatmeandIshrugged耸肩.Thethirdprizewasannouncedanditwasnotme.Iwasrelieved释然anddisappointedatthesametime.Thesecondprizewasannounced.Itwasme.IwentuptothestageandreadwhatIhadwrittenMyFather’sSon.WhenIfinishedthepeoplestoodupandcheered.Isawmyfatherblowinghisnose.Tearswererunningdownmymother’sface.Dadclearedhisthroatandputhishandonmyshoulder.Sonthisistheproudestmomentofmylife.Itwastheproudestmomentofmylifetoo.MaybeI’llneverbeagreatheroorwinaNobelPrizebutitwasenoughjusttobemyfather’sson.Thewriterfeltproudwhenhe______.
DuringourtwomonthsontheroadBennettandIhadareally1experiencewithagoodhonest2andsomehelpfulmechanics. WeweredrivingeastonHighway10whenour"chickengine"lightcameon.Welimpedofan3intoLasCruces.Wehadarealcar4Bennettnursedtheearintoalocalgarage.Bythistimethecarwasmissingso5itwasshakingallover.Thiswasthe6timetoarriveatagarage—lateFridayafternoon.ServiceadviserScottwasbusy7paperworkandcustomersaswe8ourproblems.9hewasalready"tencarsbehind"hetoldustopullthecarintothegarage. Lincolnwhowelater10wasoneofthetwomotortechnicianstook11ofourcarrepairing.HeandScottandsomeothermechanicsstayedseveralhoursafterclosing12thecar. EarlythenextmorningtheshopwasofficiallyclosedonSaturdaysLincolnfinallylocatedthe13andfixediteasilywithinonly14 LaterScott15outtousthatitwasourattitudethathelped."Youdidn’tcomeintotheplacedemandingthisorthat.Youshowedan16ofourproblemsonabusyFridayafternoon.Customer’sattitudemeansalot."Hewasrightinsomewaycustomersshouldshow17andunderstandingtopeoplewho18them.19peoplewereextremelybusytheyfoundwaytoatleasttryandhelpwhentheyaremetwithpoliteness. ThepleasantexperienceIhadshowsthat20forotherpeoplecanalwayshelp. 6.
环境
It’snoteasytobeanastronaut’sson.Everybodyexpectsyoutobespecialorperfect.Ioftenwonderhowmyfathereverhadasonlikeme.Imeanhe’ssospecialandsogoodateverythinghedoes.Eveninmiddleschoolhewasclasspresidentandcaptainofthefootballteam.WelltobehonestIoftendreamaboutbeingsomekindofheroordoingsomethingspecial-likesavingachildfromaburningbuildingordiscoveringanewstar.IwasdaydreamingatschoolonemorningwhenmyteachersaidtherewouldbeaFather’sDaywritingcompetitionforthewholeschool.Ihopewehaveawinnerrighthereinmyclass.WhenIgothomeIstartedtothinkaboutwhattowrite.Myfatherisanastronaut.NoIwouldn’tstartlikethat.Thatwasthewayotherssawhim.HowdidIseemyfatherHmm.IsawhimsittingwithmeinthedarkwhenIhadaterribledream.IrememberedhowhehuggedmeforhourswhenmydogSpottywaskilledbyacar.YesthesewerethethingsIwasgoingtowrite.Tomehewasn’tjustaworld-famousastronaut.Hewasmydad.MyparentsandIwenttoschoolThursdaynight.Thereweresomanypeopleinthebighall!MydadlookedatmeandIshrugged耸肩.Thethirdprizewasannouncedanditwasnotme.Iwasrelieved释然anddisappointedatthesametime.Thesecondprizewasannounced.Itwasme.IwentuptothestageandreadwhatIhadwrittenMyFather’sSon.WhenIfinishedthepeoplestoodupandcheered.Isawmyfatherblowinghisnose.Tearswererunningdownmymother’sface.Dadclearedhisthroatandputhishandonmyshoulder.Sonthisistheproudestmomentofmylife.Itwastheproudestmomentofmylifetoo.MaybeI’llneverbeagreatheroorwinaNobelPrizebutitwasenoughjusttobemyfather’sson.Inorderto______thewriterwouldliketosaveachildfromaburningbuilding.
判定一节课有实效最重要标准是看______
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