填空题设

填空题[A]Thetake-upofEVs—whichrunentirelyonelectricitystoredinrechargeablebatteries—isseenascentraltotheplantocutthetransportsector'scarbonemissions,bothhereandacrosstheEuropeanUnion.Itispredictedthatwewillberunningatotalof800,000EVsinBritainby2020,andasaresulttheracetoinstallarecharginginfrastructureiswellunderway.TransportforLondon(TfL)recentlyannounceditwillhave1,300EVchargingpointsinLondonby2013—morethanthecurrentnumberofpetrolstationsinthecapital.TheLondonmayor,BorisJohnson,isontherecordassayinghewantstomakethecitytheelectriccarcapitalofEurope.[B]However,thepowercompanies,sensingagoodbusinessopportunity,arenowvyingtosignupelectriccar-owninghouseholdswiththeofferofcheaperandfasteroff-peakhomechargingthatwillcutthetimeittakestorechargethevehicle—freeingittomakemorejourneys,andmakingthemmoreattractivetobuyers.Sofar,EDF,BritishGas,andmostrecentlynpowerhavesaidtheywillbetargetingEVuserswithspecialhomeservicesaswellascheapertariffsforrechargingvehicles.[C]Whatwouldmakeyouconsiderbuyinganelectriccar?Theyofferagreenwaytogetaround,withthechancetobypasspetrolstations.AndtheyareexemptfromroadtaxandLondon'scongestioncharge.Energycompanynpower(英国电力公司)thisweekrevealedthat33%ofUKdriverswouldthinkaboutbuyinganelectricvehicle(EV)inthenextfiveyears,risingto41%whenthebenefitswereexplained.[D]ButdespitetheintroductioninJanuaryofagenerous￡5,000governmentpurchasegranttoencouragemorepeopletotaketheplunge,it'sfairtosaythatsalesofelectricallypoweredcarsintheUKareyettoreallytakeoff.Justover500peopletookthegovernmentuponitsofferinthefirstquarterofthisyear.Theirhighprices—typicallyabout￡25,000afterthegrant—plusalackofmodelsbymajorcarmakersandashortageofchargingpoints,haveheldbacksales.However,thelasttwopointsareabouttochange.[E]SpeakinginBerlinlastweek,npower'sheadofe-mobility,PhilEvans,toldGuardianMoneythatthecompanyseesEVsasamajoropportunity,andasaresultitisworkingonbuildingan"upgradable"charginginfrastructurethatwilldevelopasthecars'powersystemsbecomemoresophisticated.[F]PotentialbuyersnowhaveachoiceofsevenmodelsintheUK,with13moreontheway,whileEDFEnergy(英国电网),BritishGasandnpowerhaverecentlyannouncedplanstostartofferingtoinstallfasterandcheaperchargingpointsincustomers'homes,inamovetheyhopewillhelpkick-startsales.Thecompaniesarebankingonthefactthatbuyersofthelatest,moreconsumer-friendlyelectriccars,suchastheNissanLeaf,aregoingtoboostdemandforelectricity.[G]PlansarealsounderwaytoincreasethenumberofchargingpointsatavarietyoflocationsacrosstheUK—andsoonitwillbepossibleforhomeownerstoupgradetheirgaragestoallowfaster,saferhomecharging.Untilrecently,mostownersofplug-in-to-rechargeelectriccarshavehadtorelyonthetraditionalthree-pointhouseholdplug,andwaitabouteighthourstofullyrechargetheirvehicleathome.

填空题设3阶方阵A的特征值λ 1 ，λ 2 ，λ 3 互不相同，α 1 ，α 2 ，α 3 依次为对应于λ 1 ，λ 2 ，λ 3 的特征向量，则向量组α 1 ，A(α 1 +α 2 )，A 2 (α 1 +α 2 +α 3 )线性无关的充分必要条件是λ 1 ，λ 2 ，λ 3 满足_______．

填空题设f(x)连续，且则

填空题设f(x)是连续函数，满足f(x)=，则f(x)=______．

填空题=________．

填空题计算

填空题设则(A+3E)-1(A2一9E)=________．

填空题积分=______．