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已知定义在R上的函数f(x),g(x)满足g(x)=f(|x﹣1|),则函数y=g(x)的图象关于( )
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高三下学期数学《》真题及答案
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已知fx是定义在R上的函数f1=1且对任意x∈R都有fx+5≥fx+5fx+1≤fx+1.若gx=f
已知fxgx都是定义在R.上的函数对任意xy满足fx-y=fx・gy-gx・fy且f-2=f1≠0则
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已知fx是定义在R上的函数f1=1且对任意x∈R都有fx+5≥fx+5fx+1≤fx+1若gx=fx
已知fx与gx是定义在R.上的两个可导函数若fxgx满足f′x=g′x则fx与gx满足
f(x)=g(x)
f(x)=g(x)=0
f(x)-g(x)为常数函数
f(x)+g(x)为常数函数
若函数y=fxx∈R.满足fx+2=fx且x∈[–11]时fx=|x|函数y=gx是定义在R.上的奇
已知定义在R.上的函数fx=x2+ax+b的图象经过原点且对任意的实数x都有f1+x=f1-x成立.
已知fxgx都是定义在R上的函数且满足以下条件①fx=axgxa>0a≠1②gx≠0③fxg'x>f
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某__在一次军演中要先后执行六项不同的任务要求是任务A必须排在前三项执行且执行任务A之后需立即执行任务E任务B任务C不能相邻则不同的执行方案共有
假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.每处错误仅涉及一个单词的增加删除或修改. 增加:在缺词处加一个漏字符号∧并在其下面写出该加的词. 删除:把多余的词用斜线\划掉. 修改:在错的词下划一横线并在该词下面写出修改后的词. 注意:1.每处错误及其修改均仅限一词; 2.只允许修改10处多者从第11处起不计分. Ibecameinterestinginplayingfootballthankstoasmallaccident.OneafternoonwhereIwasinprimaryschoolIwaswalkingbytheschoolplayground.Suddenlyfootballfelljustinfrontofmebutalmosthitme.Istoppedtheballandkickedithardlybacktotheplayground.Toeveryone′ssurprisingtheballwentintothenet.AllthefootballplayerontheplaygroundcheeredloudlysaythatIhadatalentforfootball.FromnowonIstartedtoplaymyfootballwithclassmatesafterschool.Iamagoodplayernow.
二项式x﹣6展开式中的常数项为.
ForCanaanElementary'ssecondgradeinPatchogueN.Y.todayisspeechdayandrightnowit'sChrisPalaez'sturn.The8﹣year﹣oldisthejokeroftheclass.Withshiningdarkeyesheseemslikethekindofkidwhowouldenjoypublicspeaking.Buthe'snervous.'I'mheretotellyoutodaywhyyoushouldshould'Christripsonthe'﹣ld'apronunciationdifficultyformanynon﹣nativeEnglishspeakers.HisteacherThomasWhaleyisnexttohimwhisperingsupport.'Voteforme'ExceptforsomestumblesChrisisdoingamazinglywell.WhenhebringshisspeechtoaniceconclusionWhaleyinvitestherestoftheclasstopraisehim.AsonofimmigrantsChrisstartedlearningEnglishalittleoverthreeyearsago.Whaleyrecalls回想起howatthebeginningoftheyearwhencalledupontoreadChriswouldexcusehimselftogotothebathroom.LearningEnglishasasecondlanguagecanbeapainfulexperience.Whatyouneedisagreatteacherwholetsyoumakemistakes.'Ittakesalotforanystudent'Whaleyexplains'especiallyforastudentwhoislearningEnglishastheirnewlanguagetofeelconfidentenoughtosay‘Idon'tknowbutIwanttoknow.''Whaleygottheideaofthissecond﹣gradepresidentialcampaignprojectwhenheaskedthechildrenonedaytoraisetheirhandsiftheythoughttheycouldneverbeapresident.Theanswerbrokehisheart.Whaleysaystheprojectisaboutmorethanjustlearningtoreadandspeakinpublic.Hewantsthesekidstolearntoboast夸耀aboutthemselves.'Boastingaboutyourselfandyourbestqualities'Whaleysays'isverydifficultforachildwhocameintotheclassroomnotfeelingconfident.'1WhatmadeChrisnervous?A.Tellingastory.B.Makingaspeech.C.Takingatest.D.Answeringaquestion.2Whatdoestheunderlinedword'stumbles'inparagraph2referto?A.Improperpauses.B.Badmanners.C.Spellingmistakes.D.Sillyjokes.3WecaninferthatthepurposeofWhaley'sprojectisto.A.helpstudentsseetheirownstrengthsB.assessstudents'publicspeakingskillsC.preparestudentsfortheirfuturejobsD.inspirestudents'loveforpolitics4WhichofthefollowingbestdescribesWhaleyasateacher?A.Humorous.B.Ambitious.C.Caring.D.Demanding.
若集合B={x|﹣1<x<2}则A∩B=
某三棱锥的三视图如图所示网格纸上小正方形的边长为1三棱锥表面上的点M在俯视图上的对应点为A三棱锥表面上的点N在左视图上的对应点为B则线段MN的长度的最大值为
若则cos2α+cosα=.
已知抛物线Cx2=2pyp>0上一点Mm9到其焦点F的距离为10. Ⅰ求抛物线C的方程 Ⅱ设过焦点F的直线l与抛物线C交于AB两点且抛物线在AB两点处的切线分别交x轴于PQ两点求|AP|•|BQ|的取值范围.
如图是一个边长为3的正方形二维码为了测算图中黑色部分的面积在正方形区域内随机投掷1089个点其中落入白色部分的有484个点据此可估计黑色部分的面积为
已知半径为4的球面上有两点AB球心为O若球面上的动点C满足二面角C﹣AB﹣O的大小为60o则四面体OABC的外接球的半径为.
Duringtherosyyearsofelementaryschool小学Ienjoyedsharingmydollsandjokeswhichallowedmetokeepmyhighsocialstatus.Iwasthequeenoftheplayground.Thencamemytweensandteensandmeangirlsandcoolkids.TheyroseintheranksnotbybeingfriendlybutbysmokingcigarettesbreakingrulesandplayingjokesonothersamongwhomIsoonfoundmyself.Popularityisawell﹣exploredsubjectinsocialpsychology.MitchPrinsteinaprofessorofclinicalpsychologysortsthepopularintotwocategories:thelikableandthestatusseekers.Thelikables'plays﹣well﹣with﹣othersqualitiesstrengthenschoolyardfriendshipsjump﹣startinterpersonalskillsandwhentappedearlyareemployedeverafterinlifeandwork.Thenthere'sthekindofpopularitythatappearsinadolescence:statusbornofpowerandevendishonorablebehavior.EnviableasthecoolkidsmayhaveseemedDr.Prinstein'sstudiesshowunpleasantconsequences.Thosewhowerehighestinstatusinhighschoolaswellasthoseleastlikedinelementaryschoolare'mostlikelytoengage从事indangerousandriskybehavior.'InonestudyDr.Prinsteinexaminedthetwotypesofpopularityin235adolescentsscoringtheleastlikedthemostlikedandthehighestinstatusbasedonstudentsurveys调查研究.'Wefoundthattheleastwell﹣likedteenshadbecomemoreaggressiveovertimetowardtheirclassmates.Butsohadthosewhowerehighinstatus.Itclearlyshowedthatwhilelikabilitycanleadtohealthyadjustmenthighstatushasjusttheoppositeeffectonus.'Dr.Prinsteinhasalsofoundthatthequalitiesthatmadetheneighborswantyouonaplaydate﹣sharingkindnessopenness﹣carryovertolateryearsandmakeyoubetterabletorelateandconnectwithothers.InanalyzinghisandotherresearchDr.Prinsteincametoanotherconclusion:Notonlyislikabilityrelatedtopositivelifeoutcomesbutitisalsoresponsibleforthoseoutcomestoo.'Beinglikedcreatesopportunitiesforlearningandfornewkindsoflifeexperiencesthathelpsomebodygainanadvantage'hesaid.1Whatsortofgirlwastheauthorinherearlyyearsofelementaryschool?A.Unkind.B.Lonely.C.Generous.D.Cool.2Whatisthesecondparagraphmainlyabout?A.Theclassificationofthepopular.B.Thecharacteristicsofadolescents.C.Theimportanceofinterpersonalskills.D.Thecausesofdishonorablebehavior.3WhatdidDr.Prinstein'sstudyfindaboutthemostlikedkids?A.Theyappearedtobeaggressive.B.Theytendedtobemoreadaptable.C.Theyenjoyedthehigheststatus.D.Theyperformedwellacademically.4Whatisthebesttitleforthetext?A.BeNice﹣YouWon'tFinishLastB.TheHighertheStatustheBetterC.BetheBest﹣YouCanMakeItD.MoreSelf﹣ControlLessAggressiveness
已知实数a=2ln2b=lnln2c=ln22则abc的大小关系是
Everyyearabout40000peopleattempttoclimbKilimanjarothehighestmountaininAfrica.They1withthemlotsofwaste.The2mightdamagethebeautyoftheplace.Theglaciers冰川aredisappearingchangingthe3ofKilimanjaro. HearingthesestoriesI'm4abouttheplace﹣otherdestinationsaredescribedaspurernaturalexperiences. HoweverIsoon5thatmuchhaschangedsincethedaysofdisturbingreportsof6amongtonsofrubbish.Ifinda7mountainwithtoiletsatcampsandalongthepaths.Theenvironmentalchallengesare8buttheeffortsmadebytheTanzaniaNationalParkAuthorityseemtobe9. ThebestofaKilimanjaro10inmyopinionisn'treachingthetop.Mountainsare11asspiritualplacesbymanycultures.This12isespeciallyevidentonKilimanjaroas13gothroughfiveecosystems生态系统inthespaceofafewkilometers.Atthebaseisarainforest.Itendsabruptlyat3000meters14landsoflowgrowingplants.Furtheruptheweather15﹣lowcloudsenvelopethemountainsideswhicharecoveredwiththickgrass.I16twelveshadesofgreenfromwhereIstand.Above4000metersisthehighland17:gravel砾石stonesandrocks.18youclimbintoanarctic﹣likezonewith19snowandtheglaciersthatmaysoondisappear. DoesKilimanjaro20itsreputationasacrowdedmountainwithlinesoftouristsruiningtheatmosphereofpeace?Ifoundtheoppositetobetrue. 1A.keep B.mix C.connect D.bring 2A.stories B.buildings C.crowds D.reporters 3A.position B.age C.face D.name 4A.silent B.skeptical C.serious D.crazy 5A.discover B.argue C.decide D.advocate 6A.equipment B.grass C.camps D.stones 7A.remote B.quiet C.all D.clean 8A.new B.special C.significant D.necessary 9A.payingoff B.spreadingout C.blowingup D.fadingaway 10A.atmosphere B.experience C.experiment D.sight 11A.studied B.observed C.explored D.regarded 12A.view B.quality C.reason D.purpose 13A.scientists B.climbers C.locals D.officials 14A.holdingonto B.goingbackto C.livingupto D.givingwayto 15A.changes B.clears C.improves D.permits 16A.match B.imagine C.count D.add 17A.village B.desert C.road D.lake 18A.Obviously B.Easily C.Consequently D.Finally 19A.permanent B.little C.fresh D.artificial 20A.enjoy B.deserve C.save D.acquire
将函数的图象上各点横坐标缩短到原来的纵坐标不变得到函数gx的图象则下列说法正确的是
Anintroductiontothisbookisassuperfluousasacandleinfrontofapowerfulsearchlight.ButaconventionofpublishingseemstorequirethatthecandleshouldbethereandIamproudtobetheonetoholdit.AbouttenyearsagoIpickedupfromthepileofnewbooksonmydeskacopyofSonsandLoversbyamanofwhomIhadneverheardandIstartedtoracethroughitwiththeimmoralspeedoftheprofessionalreviewer.ButafterapageortwoIfoundmyselfreadingreallyreading.Herewas﹣hereis﹣amasterpieceinwhicheverysentencecountsabookpackedwithsignificantthoughtandbeautifularrestingphrasestheworkofaremarkablegeniuswhosegiftsaremorerichlyvariousthanthoseofanyotheryoungEnglishnovelist.ToappreciatetherichvarietyofMrLawrencewemustreadhislaternovelsandhisvolumesofpoetry.ButSonsandLoversrevealstherangeofhistypicalpower.Herearecombinedandblended混合的sortof'realism'andalmostlyric抒情的imageryandrhythm.Thespeechofthepeopleisthatofdailylifeandthethingsthathappentothemarenormaladventuresandaccidents;theyfallinlovemarryworkfailsucceedanddie.ButoftheirdeeperemotionsandoftherelationsoftheselittlehumanbeingstotheearthandtothestarsMrLawrencemakessomethingneartopoetryandprose散文withoutviolatingitsproper'otherharmony'.TakethemarvellousparagraphonnexttothelastpageofSonsandLoversMrLawrencedependssolittleonplotintheordinarysenseofthewordthatitisperfectlyfairtoreadtheendofhisbookfirst:Wherewashe?Onetinyuprightspeckoffleshlessthananearofwheatlostinthefield.Hecouldnotbearit.Oneverysidetheimmensedarksilenceseemedpressinghimsotinyasparkintoextinctionandyetalmostnothinghecouldnotbeextinct.Nightinwhicheverythingwaslostwentreachingoutbeyondstarsandsunstarsandsunafewbrightgrainswentspinningroundforterrorandholdingeachotherinembracethereinthedarknessthatoutpassedthemallandleftthemtinyanddaunted气馁.Somuchandhimselfinfinitesimalatthecoreanothingnessandyetnotnothing.Suchgloriouswritingliftsthebookfaraboveanovelwhichismerelyastory.Ibegthereadertoattendtoeverylineofitandnottomissasingleoneofthemanysentencesthatawaitandsurpriseyou.Someareenthusiasticandimpressiveliketheparagraphabove;othersarekeen'realistic'observationsofthingsandpeople.InoneofhisbooksMrLawrencemakesacharactersayorthinkthatlifeis'mixed'.Thatindicateshisphilosophyandhismethod.Heblendstheaccuratelyliteralandtrivial琐碎的withtheextremelypoetic.TofindasimilarblendingoftinydailydetailandwideimaginativevisionwemustgobacktotwooldernovelistsHardyandMeredith.IdonotmeanthatMrLawrencederives源于directlyfromthemorindeedthatheisclearlythedisciple弟子ofanymaster.Idofeelsimplythatheisoftheelderstature名望ofHardyandMeredithandIknowofnootheryoungnovelistwhoisquiteworthyoftheircompany.WhenIfirsttriedtoexpressthiscomparisonthisconnectionIwascontradictedbyafellowcriticwhopointedoutthatMeredithandHardyareentirelyunlikeeachotherandthatthereforeMrLawrencecannotresembleboth.Tobesurenothingismorehatefulthanforcedcomparisonsnothingmoreboringthantodiscoverparallelsbetweenoneworkofartandanother.Anartist'smasteryconsistsinhisdifferencefromothermasters.Buttoreferayoungmanofgeniustoanolderoneatthesametimepronouncinghisindependenceandoriginalityisafairifnotverysuperiormethodofpraisinghim.1Theunderlinedword'superfluous'inParagraph1isclosestinmeaningto.A.meaningfulB.unnecessaryC.fundamentalD.fashionable2WhatistypicalofLawrence'sworks?A.Theyequallyrevealhisgeniuspower.B.Theycontainlotsofgreatlyricpoetry.C.Theypresentsomereallivingsituations.D.Theyfocusonrelationsbetweenhumans.3WhatdoestheauthorwanttoillustratebyincludingoneparagraphfromSonsandLovers?A.Theplotofthenovelhaslittletodowithdailylife.B.ItiswisetoreadLawrence'sbooksfromtheend.C.Lawrenceisnotcapableoftellinggoodstories.D.ThelanguageinLawrence'sbooksiselegant.4WhowereHardyandMeredith?A.TheytaughtLawrenceliteraturewhenhewasyoung.B.TheyweretherealisticnovelistsofLawrence'stime.C.Theywerenovelistswhoresembleeachotherinwriting.D.Theywerenovelistscombiningdetailswithimagination.5Accordingtotheauthorwhatdoesanartist'smasterymean?A.Hemusthavepersonaldiversity.B.Hemusthavethecriticalspirits.C.Hemustbehappytobecompared.D.Hemustbeamanofgenius.6Whatistheauthor'spurposeinwritingthepassage?A.TointroduceLawrence'snovelSonsandLovers.B.Toshowhisexperiencesofreadingclassics.C.ToanalyzeLawrence'swritingcharacteristics.D.Tocomparethestylesofdifferentnovelists.
Regulatingacomplexnewtechnologyishardparticularlyifitisevolvingrapidly.WithautonomousvehiclesAVsjustaroundthecornerwhatcanpolicymakersdotoensurethattheyarrivesafelyandsmoothlyanddeliverontheirpromise?TheimmediategoalistomakesurethatAVsaresafewithoutpreventinginnovation.InAmericaexperimentalAVsareallowedontheroadinmanystatesaslongasthecompaniesoperatingthemacceptresponsibility.ChrisUrmsonofAurorasaysAmericanregulatorshavegotthingsrightworkingcloselywithAVfirmsandissuingguidelinesratherthanstrictrulesthatmightpreventtheprogressoftheindustry.'It'simportantthatwedon'tjumptoregulationbeforeweactuallyhavesomethingtoregulate.'hesays.OntheotherhandSingapore'sgovernmenthastakenthemosthandsonapproachtopreparingforAVssaysKarlIagnemmaofNutonomyanAVstartupthathastestedvehiclesinthecitystate.Forexampleithasintroduceda'drivingtest'thatAVsmustpassbeforetheycangoontheroad.Thisdoesnotguaranteesafetybutsetsaminimumstandard.ElsewhereregulatorshavepermittedlimitedtestingonpublicroadsbutwanttoseemoreevidencethatthevehiclesaresafebeforegoingfurthersaysTakaoAsamioftheRenaultissanMitsubishialliance联盟.'Simpleaccumulationofmileage里程willneverprovethatthevehicleissafe.'hesays.Insteadregulatorsaretalkingtocarmakersandtechnologyfirmstodevelopnewsafetystandards.MartenLevenstamheadofproductstrategyatVolvocomparestheprocesstothatofdevelopinganewdrug.Firstyoushowinthelaboratorythatitmightwork;thenyourunclinicaltrialsinwhichyoucarefullytestitssafetyandefficiency;andiftheyaresuccessfulyouaskforregulatoryapprovaltomakethedruggenerallyavailable.Similarlyautonomouscarsarecurrentlyattheclinicaltrialstagewithoutfinalapprovalasyet.Itisnotpossibletoprovethatanewdrugisentirelysafebuttheriskisworthtakingbecauseofthebenefitsthedrugprovides.ItwillbethesameforAVshesuggests.Afterallnowadayshumandrivenvehiclesarehardlyriskfree.1InChrisUrmson'sopinion.A.strictrulesarenecessaryintheprogressofAVsB.wemustregulateAVsbeforeproblemsoccurC.governmentsshouldtakeapproachestopreparingforAVsD.regulatorshadbettercooperatewithAVfirmsandissueguidelines2HowistheprocessofdevelopingnewsafetystandardsofAVsexplainedinthelastparagraph?A.Bygivingexamples.B.Bymakingcomparisons.C.Byanalyzingcauseandeffects.D.Bylistingstatistics.3WhatisMartenLevenstam'sattitudetowardsAVs?A.Positive.B.Negative.C.Neutral.D.Doubtful.
故选Iwasholdingherhandwhenthemaninthewhitecoatcamein.1bothsetsofX﹣rayshesaidseriously:Herlungswerefillingupwithfluid液体.Thismeantthat2Iwouldneedtoconsultwithspecialistsandstopwhateverwas3intomymother'slungs. 4thisdoctorseemedtohaveanotherplan.Hebeganspeakingtomeaboutthequalityoflife.Hegavemealistofmymother's5andthenconcludedthattheyaddeduptothe6ofherlife.IhadheardthephraseWecanmakeher7toomanytimes.NowIwasmore8thanhurtwhendoctorswantedtokillmymother. Mymothercouldn'twalktalkorswallowafterherstrokebutnursingherwasnot9.WheneverIaskedherifherdiseasesweretoohardonhershejust10herhead.Shewasconveyingtomeherloveandunderstandingbeyond11.Andnotjusttome. Ayoungnursestoppedmejustbeforethedoctorappeared:YouknowI12mynewjobtoyourmother:She13metolearntodrivesoIwouldbenot14busesandIcouldgettothehospitaltowork. SoIcouldn'thelpquestioningthedoctor's15ofqualityoflife.Howdidhearriveatthe16thatmymothershoulddie?Washemakingan17calculationthattokeepabedridden卧床不起的personalivewascostly?Hecertainlydidnotcalculateherendlesslovethewayit18everyonewhocameincontactwithher.Ifhumanlifeis19tocost﹣benefitanalysesallformsofcaringforanyreasonotherthanself﹣interestwillbe20.Canwedobetter? 1A.Lookingup B.Holdingup C.Settingup D.Drawingup 2A.immediately B.occasionally C.eventually D.recently 3A.stealing B.marching C.rushing D.storming 4A.Therefore B.Moreover C.However D.Otherwise 5A.vices B.strengths C.sacrifices D.disabilities 6A.whole B.peak C.future D.end 7A.unbearable B.moveable C.unconscious D.comfortable 8A.relieved B.excited C.disappointed D.ashamed 9A.tiring B.easy C.casual D.pleasant 10A.nodded B.hung C.shook D.lifted 11A.reach B.words C.belief D.hope 12A.relate B.owe C.lose D.submit 13A.forced B.encouraged C.intended D.ordered 14A.atthemercyof B.atalossfor C.infavorof D.inchargeof 15A.framework B.instruction C.warning D.measure 16A.precise B.rough C.arithmetic D.economic 17Aconclusion B.agreement C.consensus D.answer 18A.transmitted B.transferred C.transformed D.transported 19A.admitted B.reduced C.sentenced D.committed 20A.included B.robbed C.excluded D.confirmed
某企业对设备进行升级改造现从设备改造前后生产的大量产品中各抽取了50件产品作为样本检测一项质量指标值该项质量指标值落在[2040内的产品视为合格品否则为不合格品.图1是设备改造前样本的频率分布直方图表1是设备改造后样本的频数分布表. 1请估计该企业在设备改造前的产品质量指标的平均值每组值用区间中点值代替 2企业将不合格品全部销毁后对合格品进行等级细分质量指标值落在[2530内的定为一等品每件售价420元质量指标值落在[2025或[3035内的定为二等品每件售价300元其它的合格品定为三等品每件售价180元根据表1的数据用该组样本中一等品二等品三等品各自在合格品中的频率代替从所有产品中抽到一件相应等级产品的概率.现有一名顾客随机购买两件产品设其支付的费用为X单位元求X的分布列和数学期望. 表1设备改造后样本的频数分布表.
请阅读下面短文并按照要求用英语写一篇150词左右的文章. Thehardworkingandnever﹣give﹣upattitudeofMalaysianbadmintonstarLeeChongWeihaswonmanypeople'shearts. The36﹣year﹣oldplayerisalreadyaveteranofthebadmintonworld.Despitethishedoesn'twanttocallitaday.Atthemomentnosecanceriskeepinghimoutofthegame. AtapressconferenceearlierthismonthLeesaidthathehopestoreturntobadmintonnextyearandtocompeteinhisfifthOlympicGamesheldinTokyoin2020.It'sgoingtobetoughtofightforthegoldmedalbutIwilltrymyverybestbecauseit'salwaysmydreamhesaid.AlthoughLeeisoneoftheworld'sgreatestplayershehasneverwonabadmintonworldchampionship.SoifhealthpermitshewillcontinuetocompetebecausehewantsanOlympicgold.Besideshisgreatdeterminationhisotherdriveishispassionforthesport.OneofthemostimportantthingsinlifetohimisbadmintonLee'scoachMisbunSodiktoldtheNewStraitsTimes. AftertwomonthsofcancertreatmentthatcausedeatingandsleepingproblemsrecentlyLeebeganalittletraining. 【写作内容】 1.用约30个单词概述上述信息的主要内容; 2.综合上述信息用约120个单词谈一谈热情对于一个人事业成功的重要性及其理由. 【写作要求】 1.写作过程中不能直接引用原文语句; 2.作文中不能出现真实姓名和学校名称; 3.不必写标题. 【评分标准】 内容完整语言规范语篇连贯词数适当.
已知函数fx=ex﹣ax﹣y﹣1=0是曲线y=fx的一条切线.其中e为自然对数的底数 1求fx的解析式 2证明fx﹣lnx>0.
已知fxgx分别是定义在R上的奇函数和偶函数且g0=0当x≥0时fx+gx=x2+2x+x﹣bb为常数则f﹣1﹣g﹣1=
在△ABC中则=
函数fx=ex﹣e1﹣x﹣b|2x﹣1|在01内有两个零点则实数b的取值范围是
如图正方形网格纸中的实线图形是一个多面体的三视图则该多面体各表面所在平面互相垂直的有
如图所示正方体ABCD﹣A1B1C1D1的棱长为2EF为AA1AB的中点M点是正方形ABB1A1内的动点若C1M∥平面CD1E则M点的轨迹长度为.
将y=fx的图象向右平移个单位再把所得图象上所有点的横坐标伸长到原来的2倍得到y=sinx﹣的图象则fx=
已知函数fx=|x+a|+|x+2|. 1当a=﹣1时求不等式fx≥2x+3的解集 2若不等式fx>|x﹣4|在[﹣11]恒成立求a的取值范围.
如图三棱台ABC﹣EFG的底面是正三角形平面ABC⊥平面BCGFCB=2GFBF=CF. Ⅰ求证AB⊥CG Ⅱ若BC=CF求直线AE与平面BEG所成角的正弦值.
已知数列{an}满足a1=1an+1=2an+n﹣1. 1设bn=an+n证明数列{bn}是等比数列 2设数列{an}的前n项和为Sn求Sn.
已知全集U={1234}集合A={23}集合B={13}则A∩∁UB=
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高三上学期数学
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教案备课库
高一上学期生物
高一下学期生物
高二上学期数学
高二上学期物理
高二上学期英语
高二上学期生物
高二下学期数学
高二上学期化学
高二下学期物理