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若a>0,b>2,且a+b=3,则使得+取得最小值的实数a= .
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高三下学期数学《》真题及答案
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若函数fx=x2-2x+3在区间[0m]上的最小值是2最大值是3则实数m的取值范围是________
若实数xy满足x>y>0且log2x+log2y=1则的最小值为.
已知实数xy满足若z=3x﹣2y取得最小值时的最优解xy满足ax+by=2ab>0则的最小值为.
若且则使得取得最小值的实数=
下列命题其中正确命题的序号是________.①设ab是非零实数若a
已知a为实数且函数fx=x2-4x-a1求导函数f′x2若f′-1=0求函数fx在[-22]上的最大
已知两点
(3,0),
(0,4),动点P.(x,y)在线段AB上运动,则xy( ) A.无最小值且无最大值 B.无最小值但有最大值
有最小值但无最大值
有最小值且有最大值
已知xy都是正实数且x+y-3xy+5=0.1求xy的最小值2求x+y的最小值.
若关于x的函数fx=t>0的最大值为M.最小值为N.且M+N=4则实数t的值为___________
在实数集R.中定义一种运算*对任意ab∈R.a*b为唯一确定的实数且具有性质1对任意a∈R.a*0=
2
3
6
8
若ab为实数且a+b=2则3a+3b的最小值为
18
2
6
2
若且则使得取得最小值的实数=
若实数xy满足且z=2x+y的最小值为4则实数b的值为
0
2
3
4
若实数abc满足对任意实数xy有x+2y-3≤ax+by+c≤x+2y+3则a+2b-3c的最小值为
-6
-4
-2
0
已知实数xy使得x2+4y2-2x+8y+1=0则x+2y的最小值等于________.
设fx在[01]上连续在01内二次可导且fx在[01]上的最大值M=2最小值m=0求证若fx的最大值
若是正实数且则当且仅当时等号成立利用以上结论可以得到函数的最小值为__取得最小值时的值为.
已知向量a=m-1b=.1若a∥b求实数m的值2若a⊥b求实数m的值3若a⊥b且存在非零实数kt使得
已知函数fx=log4ax2+2x+3.1若fx的定义域为R.求实数a的取值范围.2若f1=1求函数
ab为正实数若函数fx=ax3+bx+ab﹣1是奇函数则f2的最小值是
2
4
8
16
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10分阅读下面短文根据其内容写一篇60词左右的内容概要. IsearlychildhoodeducationreallynecessaryEarlychildhoodeducationprimarilypaysgreatattentiontolearningthroughplayingtodevelopthechild'sphysicalsensorycommunicationalandsocialdevelopment.Earlychildhoodeducationhasbecomeaconcernofthegovernmentwhopushespoorchildrentobeformallytrainedbeforetheyareoldenoughforkindergarten. Therearegoodreasonsforthegovernmenttopushearlychildhoodeducation.Studieshaveshownthatorphaned成为孤儿childrenwhodidnotreceivegoodcareandeducationbecomedevelopmentallydelayedcausingfailureinschoolandeveninlife.FurtherstudiesshowthatpoorchildrenwhotakepartinHeadStartprogramsaremorepreparedforschoolwithmuchlesspossibilityofendingupinSpecialEducationclassesreceivingpublichelporgoingtoprison. Therearealsonegativepartstoputachildinformaleducationprogramstooearly.TimeMagazineonlineexplainsthattheyoungerthechildthelesshischancesofcatchingupwithfirstgradework.Ihavepersonallywitnessed见证manychildrenofmygenerationwhowenttoHeadStartprogramsbecomefrustratedandboredwithschoolbeforetheyfinishedhighschool. Actuallywhileearlyformaleducationofpoorchildrendoesshowgreatgainsintheearlyprimaryyearsstudiesalsoshowthatthisheadstartisreallyafalsestartasthegainsarelostinmiddleandhighschoolyears.Itseemsthatenvironmentisabiggerfactoronlife'ssuccessthanearlyeducation.HeadStartprogramshavenotachieveditsoriginalgoalinclosingtheachievementgap差距inpoorandmiddleschoolchildren.Perhapsitistimetofindotherwaystoclosethatgap.
1分CCTVhasbeenbroadcastingEnglishprogramswiththeeofChinesewhichhelpstheEnglishlearnersalot.
10分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. IfyouhaveachancetogotoWuhanavisittoHubuAlleyissomethingnottobemissed.LocatedinWuchangDistrictHubuAlleyiswideknownformouth﹣wateringsnacks.Eachtimewhenyougotherethealleyiscrowdedwithpeople.TherearevarioustastyfoodstochooseofincludingsteamedporkdumplingsJingwuduckneckandhotdrynoodlesallofthemarenativetoWuhan.Wanderingalongthestreetyoumayappreciatethecookingprocessonspot.Somefoodstandshaveevenbeenexistedthereforseveralgenerationsduringwhichthemethodoffoodpreparationtogetherwiththesecretingredientshadremainedunchanged.Theseattentiveeffortsareaimedtodelivertheoriginalflavorasbefore.Inawaythesedistinctivesnackmakeyoueasytoexperiencethefolkculture.ExposingtothetraditionalfoodyouwillsurelyhaveadeeperunderstandingofWuhan.
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8分Theabilitytopredictthefutureisararetalent.AmericanauthorIsaacAsimovoneofthegreatestscience﹣fictionwritersofhisagehadsuchatalent.Backin1983hewasaskedtopredicthowtheworldwouldlooklikein2019.Nowthatwe'reherelet'sseewhathegotright. Ontherolethatcomputingwouldplayinthefuturehewasamazinglyaccurate.Asimovthoughtcomputerswouldcausearevolutioncomparabletotheindustrialrevolutionofthe19thcentury.Specificallyhesaidthatmobilecomputerizedobjectswouldbeanimportantpartofeverydaylife.Hereheclearlyforesawourworldofsmartphonestabletsandotherdevices.Healsohadagreatdealtosayaboutspaceexploration.TheInternationalSpaceStationproveshispredictionthatwewouldnotsimplyvisitspacebutseektostaythere. HowdidAsimovdevelophisspecialsenseoffuturedevelopmentsAsaprecociousboyAsimovtaughthimselftoreadattheageoffive.Hereadthenewspapersandmagazinessoldinhisparents'candystore.HisscientificinterestsgainedsharperfocusatColumbiaUniversityinNewYork.Asimovwenttostudychemistrybutbecameboredwithpurelaboratoryscience.Insteadhethoughthardaboutthesocialsignificanceofscience.Hewantedtocommunicatehisideastothepublic.Asanauthorhisbookswouldfeaturethethemeofsocialchangecausedbytechnology. Asimovhadhisfingeronthepulseofbothscientificandsocialchange.HehadaclearsightofwhatwascomingaroundthecornerforhumanityinhisworksliketheGalacticEmpireseries. HispredictionsareabsolutelyfascinatingCalumChaseanEnglishwritertoldBBCNews.Hewasagenius. 1WhichofthefollowinghasAsimovmadeapredictionabout ①computers②environment③tablets④space⑤pollution⑥smartphones A.②⑤⑥ B.①③④ C.②③④ D.①⑤⑥ 2WhatdoweknowaboutAsimov A.Asimovhadgreatinterestinpurelabscience. B.Asimovkeptpacewithscientificandsocialchange. C.Asimovcaredlessaboutthesocialsignificanceofscience. D.Asimovwouldreadinhisneighbor'scandystoreinhischildhood. 3Whatdoestheunderlinedwordprecociousinthethirdparagraphprobablymean A.Talented. B.Naughty. C.Considerate. D.Optimistic. 4Whatwillbethebesttitleofthepassage A.TheFocusonSocialChange B.AGreatScience﹣fictionWriter C.TheAbilitytoPredicttheFuture D.TheManWhoCouldSeetheFuture
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8分Thismaysoundlikeajokeaboutalazyperson'sdreamjobEarnbigmoneybystayinginbedandwatchingTV.Butthisisreallyhappeningandit'saprojectofNASAwhichiscalledArtificialGravityBedRestStudy. Scientistsareseeking12womentospendtwofullmonthsinbedinthefallataGermanlabplusanadditionalmonththereforpreparationandrecovery.Thefirstgroupof12testsubjectsallmenalreadyhavestartedthestudy.Eachparticipantwillreceivearewardofabout$18500.Theresearchersarestudyinghowthebodyadaptstoweightlessnessinspacewhichwillhelpastronautsinfuturemissions.Apparentlybeinginbedforalongtimeissimilarenoughtobeingingravity﹣lessspace. Studysubjectswillspendthe60dayswiththeirheadstilted倾斜downsixdegreesmuchlikeconditionsinspace.Withoutgravitysendingbloodtothelegsastronauts'headsarefilledwithfluidsresultinginpuffy﹣headbird﹣legssyndromeaccordingtotheNASAwebsite.Researcherswillstudyhowtheshiftsinfluidaffectparticipants'bodiesaswellaspossibleboneandmuscleloss. ParticipantsareencouragedtopassthetimebywatchingTVreadingordoinganyotheractivitieswhilelyingdownaloneinbedtoovercometheextremeboredom. Participantsalsoneedtobenonsmokersbetweenages24and55ingoodhealthwithnormalbodyweight.Duringthestudytheywillspend30minutesadayinwhatiscalledashort﹣armhumancentrifuge离心机whichproducesartificialgravityanddistributesfluidsfromtheheadbackintothebody. Ifinterestedintheprojectyoucanapplyandclickhere. 1WhatdoweknowabouttheprojectofNASA A.Itwillcost$18500inall. B.ItiscarriedoutinAmerica. C.Itisnowseeking12mentestsubjects. D.Ittakessubjectsthreemonthstobeintheproject. 2WhichofthefollowingstatementsisTURE A.Alltheparticipantswillbetestedinspace. B.Theresearchisoflittleusetoastronautsinfuturemissions. C.Participantsbeingtestedarerequiredtobefullyconcentrated. D.Shiftsinfluidtogetherwithboneandmusclelosswillbestudied. 3Whoisthemostlikelytobeacceptedasaparticipantintheproject A.Kateateacherobese. B.Jackateenagerhealthy. C.Maryinherthirtiesathletic. D.Tomaheavysmokerknowledgeable. 4Whatisthepassageintendedtodo A.Tostudypuffy﹣headbird﹣legssyndrome. B.TointroduceaprojectofNASAtoreaders. C.Topersuadewomentoparticipateintheproject. D.Toinformreadersoftheprinciplesofcentrifuge.
某中学数学竞赛培训班共有10人分为两个小组在一次模拟测试中两个小组成绩的茎叶图如图所示已知甲乙两组同学成绩的平均数相同则甲乙两组同学成绩的中位数之差为
8分Catscommunicateavarietyofmessagesusingcatbodylanguage.Examplesincludearching弓起theirbacksasasignaloffearorattackandslowlyblinking眨theireyestosignalrelaxation.Mouthopenandnoteethshowedsuggestsafeelingofplayfulness.Acatwhichchoosestolieonitsbackshowshappinesstrustandcomfort.Catsshowdissatisfactionbymovingtheirearsbackequaltoahumanfrown. Asisthecasewithdogsatwitching抽动tailcanmeanalittleangerwhileatailheldhighsuggestsconfidence.Catswilltwitchtheirtailswhenhuntingorangrywhilelargertwitchingsuggestsdispleasure.Theymayalsotwitchtheirtailswhenplaying.Atailheldhighisasignofhappinessorcanbeusedasagreetingtowardshumansorothercatsusuallycloserelativeswhilehalf﹣raisedshowslesspleasureandunhappinessisexpressedwithatailheldlow. Somecharacteristicsignalshoweverareoftenmisunderstood.Itisimportanttokeepinmindthateachcatmayshowitsfeelingswithdifferentbodylanguage.Forinstanceacatrubbingitsbodyalonganarmorlegofitsownerisnotonlyawayinwhichtoattractattentionandperhapsawaytoaskforfooditisalsoawayofmarkingitsownerasitsown.Usuallyacatwithitstailheldhighandtwitchingshowsexcitementbutthisisoftenmistakenforanger. Manypeoplefailoraretooslowtounderstandthesilentbodylanguageofcats.Andtheymayhavethefalseimpressionthatcatsarecold﹣heartedunfaithfulornotclever.Tounderstandcatspeoplemustobserveacatcloselyandlearnwhatitsbodysignalstellthem. 1Whichcatbodylanguageshowsthatacatisrelaxed A.Lyingonitsstomach. B.Blinkingitseyesslowly. C.Holdingitstailhigh. D.Movingitsearsback. 2AccordingtothepassageacatwilltwitchitstailEXCEPT. A.whenitfeelssleepy B.whenitishunting C.whenitfeelsangry D.whenitisplaying 3Howmanymeaningsdoesacat'srubbingitsbodyalongitsownerhave A.2. B.3. C.4. D.5. 4Thelastparagraphintendstotellus. A.manypeopleoftenhavewrongopinionsoncats B.itisnoteasytounderstandcats'bodylanguage C.everycathasitsownspecialbodylanguage D.weshouldlearnmoreaboutcats'bodylanguage
已知等腰梯形ABCD中=2EF分别为ADBC的中点G为EF的中点若记==则=
30分Walkingacrosscampuswitheverypairofeyesonyoucanbeembarrassingespeciallywhenyou're13yearsold.Ilookedaroundmein1ofafriendlyfaceasmileanything.Iwasquitedisappointed.AndI2feltsomewhatfoolishwalkingacrosscampus3withafalsesmileplastered粘贴acrossmyface.Iwassimply4tofollowtheadvicemymotherhadgivenmeyearsbeforewhenthingsget5smile.Nomatterwhereyouareasmilewillalwaysbeunderstood.Asmileis6.AtthatverymomenthoweverIfeltmymother'sadvicedidn't7. Whentheteacher8metotheclassastheAmericangirl10setsofhandsimmediatelyshotup.Somestudentshad9otherswantedtopracticetheirEnglishwithme.BecauseIcouldn'tspeakmuchChinese10Icommunicatedwiththemviagesturesmixedinwith11EnglishandChinese.AlthoughIwas12Iwasn'tsurehowmuchofitwas13.Itwasalmostasiftheywere14aboutmeandIwasbeingexamined.15whocouldblamethemAfterallIwasthefirstAmericaneverto16theschool. ThenfromacrosstheroomaChineseclassmatesuddenly17atmeandmynerveswereinstantly18.Thoughthereareculturalandlanguage19weweresharingsomethingincommon.Andasusualmymotherwasright.Asmiledoesmakea20. 1A.favor B.memory C.place D.search 2A.inturn B.inreturn C.inaddition D.invain 3A.steadily B.attractively C.alone D.unwillingly 4A.helping B.attempting C.pretending D.undertaking 5A.awkward B.smooth C.ready D.attainable 6A.universal B.warm C.ordinary D.traditional 7A.last B.work C.exist D.change 8A.led B.introduced C.took D.invited 9A.examinations B.explanations C.questions D.thrills 10A.either B.often C.sometimes D.yet 11A.broken B.standard C.fluent D.everyday 12A.spotted B.focusedon C.ignored D.watchedout 13A.positive B.direct C.interesting D.open 14A.hopeful B.nervous C.worried D.curious 15A.Aboveall B.Oncemore C.Thenagain D.Asusual 16A.attend B.leave C.study D.explore 17A.shouted B.waved C.nodded D.smiled 18A.felt B.touched C.calmed D.tested 19A.similarities B.barriers C.links D.connections 20A.fortune B.noise C.deal D.difference
已知锐角△ABC中角ABC所对的边分别为abcsinA﹣cosCsinB+cosB=0. 1求角C 2若b=c=求AB边上的高长.
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8分TheMcDonnellslivedinasmallbrickhouseinLarchmontasuburbofNewYorkCity.Jimwasforemanofmailcarriersatthepostofficewherehehadworkedfor25years.Marriedin1960heandAnnewerechildless. OntheeveningoftheeleventhanniversaryoftheirmarriagecarryingoutthegarbageJimMcDonnellslippedonice﹣coatedstepsandstruckhishead.Afewdayslaterdrivingtoworkhelostcontrolofthecarhitatelephonepoleandbangedhisforeheadagainstthewindshield.Thefollowingdayhefelloffthestairsandagainhebangedhishead.Foundunconscioushewashospitalizedforthreedayswithacerebralconcussion脑震荡.OnedayinthesamemonthJimborrowedafriend'sstationwagonanddrovetoKennedyAirporttopickupAnne'sbrotherandfamily.Whenhereturnedtheborrowedcarat10p.m.hewasunawarethatthewalletcontaininghisidentificationhadslippedoutofhispocketontothefloorofthestationwagon.Afterthathewasneverseenagain. SowhatreallyhappenedtoAnne'shusbandDuringhiswalkhomeJimhadindeedblackedout昏厥losingallabilitytorememberwhohewasandwherehelived.Whathappenedthenisunclear.ThenextthingheknewwasthathewasindowntownPhiladelphiaacityhehadnevervisitedbefore.SeeingsignsadvertisingtheservicesofaJamesPetersarealestatebrokerJimadoptedJamesPetersashisownname.Hehadnopasthisonlyrealitywasthepresent.JamesPetersgotaSocialSecuritycardwhichcouldbeobtainedatthattimewithoutshowingabirthcertificateandtookajobinahealthclub.Henextworkedatacancerresearchinstitutecleaningoutanimalcages.HealsogotanightshiftjobattheP&Pluncheonettewherehebecamewellknownforhisomeletsaswellashiscourtesyandgoodhumor. AboutamonthbeforeChristmas1985colleaguesnoticedthatJimhadgrownunusuallyquietanddepressed.Somethingseemedtobeturninginhismind.OnDecember22Jimhadfallenandbangedhishead.Thenextdayatworkheseemeddistractedandlatethatafternoonhehadfallenagainstrikinghishead.OnDecember24heawokefeelingconfusedyetdelighted.Afteralmost15yearsheknewwhohewas!HewasJamesA.McDonnellJr.ofLarchmontNewYork.Hiswife'snamewasAnne. AnnehadjustreturnedhomefromChristmasMasswhereshelitcandlesandprayedforJim.AlightsnowwasfallingandshewasinahurrytoleaveforChristmasdinnerathersister'sbeforetheroadsgrewslick.Thenthedoorbellrang.Ohmyshethoughtthisisnotagoodtimeforavisitor.Anneopenedthedoor﹣andsawamanwithafullwhitebeard.ImmediatelysherecognizedJim.Shecouldn'tspeak. ToJimAnnelookedalittleolderbutprettiertoo.Hisheartoverflowed. HelloAnnehesaid. 1InwhichyeardidJamesA.McDonnellgetmissing A.1960 B.1965 C.1971 D.1985 2WhichCANNOTexplainthesentenceHehadnopastinParagraph3 A.HehadnoSocialSecurityCardbeforehegotlost. B.Helosthismemoryafterhisblackingout. C.Helosthiswalletcontaininghisidentification. D.Hewenttoacompletelystrangecity. 3HowdidJimfeelonseeinghiswifeAnne15yearslater A.scared B.funny C.moved D.anxious 4Whatwouldbethebestsentencefollowingthelastsentenceofthispassage A.JimherbreathcameinburstsIsittrue B.YessheseemedpuzzledAndyouarelookingfor… C.WellJimhervoiceindelightLongtime. D.ComeoninsaidAnneI'mexpectingyou.
某几何体的三视图如图所示则该几何体的表面积为
2分由于事先没有消除一个重大的误解双方在即将到来的贸易会谈中达成协议的可能性不大. amajormisunderstandingneithersideanagreementinthecomingtradetalks.
1分TheschooloffersusvactivitiesforustochoosefromtoourownInterestsofwhichIlikeplayingchessbest.
10分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.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. 修改在错的词下面画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. DearPeter ThanksforyourfocusinmysharingmomentsonmyWechat.KnowthatyouarecuriousabouthowwecelebrateChineseValentine'sDayI'mwritingtotellyouofsomethingaboutit. ChineseValentine'sDaywhichfallonthe7thdayofthe7thlunarmonthisnowcelebratedinmanyplacearoundChina.Onthatdaycouplesgettogetherforthebigmealexchanginggiftslikeflowerschocolatesandgreetingcards.Besidesmanyyoungpeoplechoosethedaygetmarried.Itisactualafestivalfornotonlyloversorcouplesandalsofamilymemberstoshowlovetoeachother. CouldyoutellmethecelebrateofValentine'sDayinyourcountry Lookingforwardtohearingfromyou. Yours LiHua
设函数fx=|x﹣1|+|x+a|a∈R. 1若不等式fx≥6的解集为﹣∞﹣4]∪[b+∞b>﹣4求ab的值 2若fx≥a|x|对任意x∈R恒成立求a的取值范围.
6分 SummerCamps Makeyoursummermagicalwithaone﹣of﹣a﹣kindsummercampexperience! Half﹣dayweek﹣longcampsareheldfrom9am﹣12pmor1pm﹣4pm. Dailysnackswillbeprovidedandevenbecomepartofthehands﹣onfun! Session1﹣﹣﹣OceanCommotion暴动 Setsailforfunandadventureonthedeepbluesea!CampersexploreunchartedlandatTheMagicHouseanddiscoversomethingfishyastheycomeintotheexcitingworldofseacreatures. June6﹣10 June13﹣17 June20﹣24 Session2﹣﹣﹣SuperkidsExploreEarth Campersbecomesuperheroestotheearthastheylearnabouttheenvironmentanddiscoverhowtousetheirsuperpowerstoprotectit!Duringthisaction﹣packedweekcamperswillexploretheearthfromtheskytotheseaandparticipateinfunearth﹣friendlyactivitiessuchasturningtrashintotreasure. June27﹣July1 July11﹣15 July18﹣22 Session3﹣﹣﹣OnceUponATime Atthisuniquefairytale﹣themedcampcampershaveamagicalmake﹣believeadventurethroughthepagesofsomeoftheirfavoritestorybooks.Campersexperiencegaint﹣sizedfunastheyusetheirimaginationstotraveltoplacesfoundonlyinfairytales. July25﹣29 August1﹣5 August8﹣12amsessionsonly Allcampersmustberegisteredinadvance. 1Whatdoestheunderlinedwordone﹣of﹣a﹣kindinParagraph1mean A.Long B.Unique C.Official D.Moving 2WhatisthemainpurposeofSession2 A.Toencouragereading. B.Toinspireimagination. C.Todevelopthespiritofadventure. D.Toraiseenvironmentalawareness. 3WhatdocampersprobablydoduringSession3 A.Readfairystories. B.Travelthecountry. C.Searchfortreasure. D.Learnaboutanimals.
30分ThestagelightsdimmedandItookaquicklookfrombehindtheheavyblackcurtainsintothe1.BlindedbythelightsIquickly2.Itseemsthatagreatnumberofeyeswerelookingatme.Itookadeep3asthemusicofmydancebegantoplay.Ienteredthestageandbeganmy4thegraduationtestoftheclassicalIndiandance. AfteradecadeoflearningthisartformIhad5beenconsideredreadytotakeonthemostdifficultact.Thetestisthemostimportanteventinadancer'slifeasitpays6toallthefactorsinone'slifethat7thedanceformone'scultureandfamily. Theperformanceisundertakenonlybythemost8anddeterminedstudents.Itisadifficultprocessthatrequiresmuchcommitment.FormorethansixmonthsIspenttwotothreehourseveryday9thesedances.ManytimesI10myselftomyphysicalandmentalbreakingpointbutstillIwouldnotstop.Icouldnotgiveup.Therewasalwayssomuchmoretodoandsomuchmoreto11. I12alotaboutmyselfinthosetiringhours.IlearnedthatIwasfartoo13togiveupandIwastooproudtoprovemyself14afterIhadsetanunrealisticgoal.Evenwithphysicalpainandmental15Iforcedmyselftomeetmy16.EvenwhenIwasattheendofmy17therewasalwayssomethingdrivingmeonforcingmenottogiveup. FortunatelyImadeit.WhatIhaddone18thesuccess.ItwasinthosehoursthatIlearnedwhatadancer19is.ThosetimewasevidencethatIcould20somethingIsetouttodo. 1A.carpenter B.audience C.actress D.Diver 2A.pulledback B.setoff C.reachedout D.brokeaway 3A.sleep B.thought C.breath D.sorrow 4A.career B.attempt C.response D.performance 5A.easily B.eventually C.occasionally D.directly 6A.debt B.visit C.interest D.respect 7A.develop B.rescue C.introduce D.convince 8A.focused B.beautiful C.intelligent D.considerate 9A.recording B.practicing C.discussing D.designing 10A.applied B.addicted C.treated D.pushed 11A.forget B.design C.learn D.research 12A.regretted B.discovered C.controlled D.confused 13A.brilliant B.brave C.stubborn D.discourage 14A.wrong B.nervous C.frightened D.careless 15A.function B.action C.level D.stress 16A.budget B.expectation C.cost D.deadline 17A.limit B.purpose C.preparation D.destination 18A.increased B.deserved C.expanded D.exposed 19A.completely B.chiefly C.truly D.originally 20A.change B.supply C.explain D.achieve
已知函数fx=x3﹣2x则曲线y=fx在点1f1处的切线的倾斜角是
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