首页
试卷库
试题库
当前位置:
X题卡
>
所有题目
>
题目详情
若a>0,b>0,且函数f(x)=4x3﹣ax2﹣2bx﹣2在x=1处有极值,则ab的最大值( )
查看本题答案
包含此试题的试卷
高三上学期数学《》真题及答案
点击查看
你可能感兴趣的试题
若a>0b>0且函数fx=4x3-ax2-2bx+2在x=1处有极值则ab的最大值为________
设函数fx=lnx﹣ax+﹣1.Ⅰ当a=1时求曲线fx在x=1处的切线方程Ⅱ当a=时求函数fx的单调
下列四个命题1函数fx在x>0时是增函数x<0也是增函数所以fx是增函数2若函数fx=ax2+bx+
0
1
2
3
已知函数fx=x3+ax2+3bx+cb≠0且gx=fx-2是奇函数 1求ac的值 2求函数fx的
已知函数fx=ax2+bx+ca≠0且fx=2x没有实数根那么ffx=4x的实根个数为
0
1
2
4
设函数fx=ax2+bx+kk>0在x=0处取得极值且曲线y=fx在点1f1处的切线垂直于直线x+2
已知a>0b∈R.函数fx=4ax2﹣2bx﹣a+bx∈[01].Ⅰ当a=b=2时求函数fx的最大值
若a>0b>0且函数fx=4x3-ax2-2bx+2在x=1处有极值则ab的最大值等于
2
3
6
9
若二次函数fx=ax2+bxa≠0满足1≤f-1≤2且2≤f1≤4求f2的范围.
若函数fx=ax3+bx2+cx+d满足f0=fx1=fx2=00<x1<x2且在[x2+∞上单调递
设函数fx=ax2+bx+1ab∈R.且a≠0若f﹣1=0且对任意实数x不等式fx≥0恒成立.1求实
若a>0b>0且函数fx=4x3-ax2-2bx+2在x=1处有极值则ab的最大值等于
2
3
6
9
若a>0b>0且函数fx=4x3-ax2-2bx+2在x=1处有极值则ab的最大值等于_______
已知函数fx=x3+ax2+3bx+cb≠0且gx=fx-2是奇函数1求ac的值2求函数fx的单调区
若a>0b>0且函数fx=4x3-ax2-2bx+2在x=1处有极值则ab的最大值等.
9
6
3
2
若a>0b>0且函数fx=4x3-ax2-2bx+2在x=1处有极值则ab的最大值等于
2
3
6
9
设fx=3ax2+2bx+c若a+b+c=0f0>0f1>0求证:1a>0且-2
若a>0b>0且函数fx=4x3﹣ax2﹣2bx﹣2在x=1处有极值则ab的最大值
2
3
6
9
已知fx=ax2+bx+c若f0=0且fx+1=fx+x+1求函数y=fx的解析式.
热门试题
更多
1分Welookforwardtomeetingyouandwishyouajourney.please
1分Whenyouaretravellingbringamapbecauseithelpyou. A.can't B.mustn't C.usedto D.may
2分Jim'sneverreadthebookTheAdventureofTomSawyer.改为反意疑问句 Jim'sneverreadthebookTheAdventureofTomSawyer?
1分Ienjoyaboutgreatpeople'slivesbecauseIalwayslearnalotfromthemandtheyencouragemetomarchon. A.read B.toread C.reading D.reads
1分UncleWanggaveallhissavingstotheHopeSchoolhehimselfwasnotrich. A.because B.asif C.though D.or
2分Studentsabroadshouldtakegoodcareofthemselveswhentheyareinforeigncountries.保持句意基本不变 Studentsabroadshouldthemselveswhentheyareinforeigncountries.
2分Wehaven'tdiscussedyetwherewearegoingtoputournewtable.改为简单句 Wehaven'tdiscussedyetputournewtable.
8分InwhatcasewouldTangDynastypoetLIBaiandWesternheroKingArthermeetandfightagainsteachother?IfnotinyourdreamthenperhapsinagamecalledKingofGlory王者荣耀.CreatebyChinesecompanyTencentKingofGlorywasoneofthemostpopularMOBAgameinChinain2017.KingofGloryhasover200millionpayersaboutoneineverysevenChinesepeopleplaysthegameand55millionofthemplayiteverydayaccordingtoJiguanaChineseanalytics分析company. Ithasover60characterstounlockandplayasyouprogresseachwiththeirownspecialstylesandabilities.Thecharacterscoverdifferenttimesandcountries.SomearerealhistoricalfigureslikeLiBai.Somearenot.Playersusethemtofightagainsteachotherorteamuptofight.Thewinnerscanreachhigherranks. Howeveralongwithhispopularityproblemshavealsocome.Notallreviewsofthegamesaregood.Somethinkthegamecanconfusechildrenbyusingincorrecthistoricalreferences参照.forexamplethepoetLiBaiisdescribedasakillerJingKethemanwhotriedtokillthefirstemperorofChinaisagirlinthegame.Morepeopleworryaboutchildrenplayingthegametoomuchandspendingtoomuchmoneyonit.Playerbelowtheageof19accountfor25.7percentofthegame'splayers.Apieceofnewinwhicha17﹣year﹣oldboyhadaheartproblemafterplayingthegamefor40hourshasalsocreateoppositeviews. TodealwiththisTencentaddedatimelimittothegametopreventkidsfromplayingtoomuch.AsofJuly42017childrenunder12yearsoldcanplaythegameforonlyonehouradaywhileusersbetween12to18gettwohours.Thosewhotrytoplaybeyondthetimelimitwillbelockedoutofthegame. 1.WhichofthefollowingisTRUEaboutKingofGlory? A.Itisthemostpopularonlinegameintheworld B.Itoffers60charactersforplayerstochoosefrom C.Allofthecharactersarerealhistoricalfigures DPlayersfightagainsteachotherorteamuptofight 2.Theunderlinedsentencetellusthat. A.KingofGloryiseasilydesignedforanyonetoplay B.KingofGloryisapopulargametoplay C.Moreplayershavebeeninvitedtoplaythegame D.KindofGloryisdesignedonlyforChineseplayers 3.WhydidTencentaddatimelimittothegame? A.Becausechildrenareverycurious B.Childrenspendtoomuchtimeplayingthegame C.Thegameusesincorrecthistoricalreferences D.Childrendon'thaveenoughtimetoplaythegame 4.Wheremightyoufindthiskindofstories? A.Inanewspaper B.Inatravelguidebook C.Inabookreview D.Inagameinstruction
八达岭野生动物园老虎伤人事件一度引起民众的广泛关注血淋淋的事件再次告诫我们遵守规则的重要性.假如你是一名保定城市文明志愿者请用英语写一篇70词左右的文章向游客宣传动物园旅游的注意事项倡导安全文明游园. 提示1Whatshouldwedotoprotectourselvesinthezoo? 2Whatshouldwedotokeeptheanimalsinthezoosafeandhealthy? 3Whatshouldwedotokeepthezooclean? 参考词汇keepawayfromtakephotosfeedthrowkeep…clean. 要求1文章包括所有提示内容可适当发挥. 2开头和结尾已给出不计入总词数. HelloeveryoneWelcometoBaodingZoo.Tohaveawonderfultripwemustfollowsomerules. Enjoyyourselvesandhaveaninterestingday.
1分Aliftisavailablehereevenifourhouseisacenturybuilding.sixteen
10分 InrecentyearsfourChinesetechnologicalinnovationsstandoutintheworld.Theyare1asfournewgreatinventionsofmodernChina. High﹣speedtrains Chinacreateditsfirsthigh﹣speedrailwaylinein2008.Sincethenthenumberofpassengertripshasincreased2over30percenteveryyear.Bytheendof2016morethan5billiontripshadbeentakenonChina'shigh﹣speedtrains.Chinaiscurrentlyworkingonthenew3oftrainsthatwillhaveatopspeedof400kilometersperhour.By2020one﹣fifthofthecountry's150000kmrailwaynetworkwillbeusedbyhigh﹣speedtrains.ThisnetworkwillconnectmorethanpercentofmajorcitiesacrossChina. Mobilepayment Mobilepaymentis4Chinaintoacashlesssocietywhichisledbythird﹣partpaymentcompanieslikeAlipay.Forexampleinsteadofplayingbycashcustomersnowpayforgoods5byputtingashortpassworldintotheAlipayappon6mobilephone.Userscanalsopaytheirwaterand7billsthroughit.Alipayalsoallowsuserstobuythingsoninternationalwebsites. Sharebikes Sharedbikes8startedinWesterncountries.ButChinahassurprisedtheworldwithhowquicklyithaswidelyusedsharedbikes.ThesebikeallowuserstopickuporparksabikeonthestreetthroughGPSandsmartphoneapps.To9abikeyoujustneedtoscanaQRcode二维码onasharedbikewithasmartphoneappandtherideaway.Afteryoufinishridingyoucanparkitatavailableareaslockitandpayforyourridethroughmobilepaymentservice. Onlineshopping Witharound751millioninternetusersChinahaslongbeentheworld's10andfastest﹣growingonlineshoppingmarket.Onlineshoppingnowaccountsfor15.5percentoftotalretailsalesinChina.Thankstolowercostsandfewerlicensingrequirementsit'seasierforsellertoopenanonlineshopinChina.Italsohelpedtocreatejobs. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
2分这些裤子和短袜多少钱? Howmucharethese?
1分﹣It'ssaidthatshoppingonlineissafe. ﹣.You'dbetterbecareful. A.Iagree B.Thatdepends C.Ithinkso D.Noproblem
14分Itdoesnotalwayscomeeasytodiscoveroneself.FromayoungageIhadastrongsenseofwhoIwastobecomebutanaccidentmademeredefine重审myself. Tomecyclingwasaboveall.Therewasn1inthisworldthatfilledmyheartwithsuchjoy.Ispenttwenty﹣fourhoursaweekpracticingmys2.Havingnosociallifeorinterestsbutcyclingmygreatlovebroughtmefirstplacemedalsinnearlyeverycompetition. UnfortunatelyinoneshowIfelldownandhurtmyselfb3.AfterseveralX﹣raysandMRI磁共振scansthedoctortoldmethatIcouldn'treturntomysportanymore.Thepaininmybackwashardtobearandeventheb4dailytasksbecamedifficult. Asmypassion激情wastakenawayIhadlittlesenseofwhoIwastobecome.Aftereightmonthsofsufferingsomethinghadtoc5.InsteadofwastingmydayssittingaroundpainfullyIbegantoputmyenergyintolocalcommunityserviceprojects.ByvolunteeringasaswimmingteacherandsummerreadingassistantforkidsIgotanideaofwhoIwantedtobecome.AfterafewmonthsIspentmostofthetimeonmyinterestinthearts.LittlebyLittleIsteppedoutoftheshadow阴影andr6myconfidence. Sometimessomelargerocksblockourway.Wecanchoosetostaybehindortrytoclimbover.Myaccidentwasarockbutitf7tostopmefromreachingsuccess.TodayI'maveryconfidentandoptimisticperson. 1. 2. 3. 4. 5. 6. 7.
2分今年他比往年更忙于学业了 Thisyearheisschoolworkthanbefore.
1分Beforethesunweneedtogettothetopofthemountain. A.set B.sets C.issetting D.willset
1分Thestudentsallfoundittofinishsomuchhomeworkinanhour.possible
10分ThedaywasThankfulThursday.Itisaweekly1thatmytwolittlegirlsandIbeganyearsago.Wegooutintheworldanddocharitywork.LastThursdayweweregoingtobuy2forthebeggarsinthestreet. Iordered15lunchesfromMcdonald'sand3todeliverthem.Welovewhatwesawinthestreetaan4andhappypersonholdinguptheirlunchbag. Thenwenoticedanoldwomanaskingforchange.Wehandedherourfinallunch.Aswegotintothecarshestartedto5tous.Noonehaseverdone6likethisformebeforeshesaidwithasmile.wellI'mgladthatwewerethefirst.Ireplied.So7willeatthelunch?Iasked. ShejustlookedatmewithherhugetiredbrowneyesandsaidOhhoneyI'mnotgoingtoeatthislunchmyself.YouseeIhavealittlegirlofmyown.Iusuallycan't8tobuyherthefoodsheenjoys.Buttonightshewillbehappy. Idon'tknowifthekidsnoticedthetearsinmyeyes.Ihavequestionedmanytimewhetherouractsofkindnessweretoo9toreallybringaboutchange.Yetinthatmoment.I10thetruthofMotherTeresa'swordsWecannotdogreatthinsonlysmallthingswithgreatlove. 1.Acelebration Bbehavior Cduty Dtradition 2.Abreakfast Blunch Cbrunch Dsupper 3.Asetout Bsetaside Csetabout Dsetup 4.Aconfident Beasygoing Csurprised Doutgoing 5.Achat Bspeak Ctell Dshout 6.Aeverything Bsomething Cnothing Danything 7.Ahow Bwhere Cwho Dwhether 8.Await Bhelp Cafford Dpromise 9.Aweak Bsmall Chuge Dmany 10.Arecognized Brefused Creceived Drecycled
5分AHeyJack!Icametoyourhouseyesterdayafternoonbutyouweren'tin. BSorrySarah!1 AWasitabirthdayparty? BNoitwasaschool﹣leavers'party.Wearegoingtofinishourmiddleschoollifesoon. ASoweare.Howaretheparty? BItwasgreatbutIfeelsadbecauseIdon'twanttoleavemydearteachersandclassmates. AThat'strue.2.Bythewaywhat'syourplanaftergraduation? BIt'shardtosay.3 AThat'sagreatidea.What'stheproblemthen? BMyparentsdon'tagree.Theywantmetogotoagoodhighschoolandthenenteragoodcollege. A4 BYesbutIonlywanttoplayfootball. A5You'dbetterhaveafurthertalkwithyourparents. A.Ihaven'tdecidedyet B.Butyoucanstillplayfootballincollegecan'tyou? C.Iwashavingapartyatschoolatthattime D.Ithinkyoushouldworkhardatyoulessons E.Afterallyouhavestayedtogetherfornearlythreeyeas F.I'dliketobeafootballplayersbecausefootballismyhobby G.That'sreallyaproblem. 1. 2. 3. 4. 5.
6分ThewordformilkinGermanisMilch.InFrenchitislait.Usuallyyoudon'tfindthesamewordsineverylanguage.ButthereisanexceptionforthewordOK. ItisthemostfrequentlyspokenexpressionintheworldOKwasfirstintroducedtotheworldintheBostonMorningPostonMar.231839.Itreado.k.allkorrectwhichmeansallcorrect.AlthoughitwasonlyajokeatthattimelaterpeoplebeganmarkingOKondocumentsandusingOKonthetelegramtosaythatallwaswell.Todaypeoplecrosscountriesusethisexpressioneveryday.Howabout2o'clock?OK?OKOKthen.ThewordOKiseasytosayandwriteandclearenoughtobeunderstood.Besidesitoffersneutrality中立thatotherwordsdon'thave.Ifyousaysomethingisgreatsomepeoplemaysayitisn't.ButwithOKeveryonegenerallyagrees. Arethereanyotherwordsthatcancrosscountriesandcultures? Huhisanothercommonlyusedword.Researchersfoundthathuhmeanssurpriseordisbeliefin10differentlanguages.Sometimespeopleneedawordtoexpressmanymeaningsatonce.Forexamplesometimesthereisaproblemofunderstandingoryouwanttoasksomebodyforareaction.Sayinghuhisshortandeasytosayandhear.Alsoyoudon'tneedtolearnthiswordjustlikeyoudon'tneedtolearntocryorlaugh.Huhjustcomesoutnaturally. Otherwidelyusedwordsincludemamawhichisconsideredtobetheeasiestwordforbabiestopronounce.Don'tforgetgameover.Itisnotonlyusedbysportsfansbutalsotodescribetheendofaneventinreallife. 1.WhichoffollowingisNottrueaboutOK?. A.Itwasajokeforallcorrectatfirst. B.Itwasfirstusedonthetelegraph C.Itiseasytobeunderstand D.It'snotastrongwordtoshowyouopinion 2.HuhiswidelyusedNOTbecause A.itcanexpressmanymeaningsatonce B.it'seasytosayandhear C.youdon'tneedtolearnit D.it'stheeasiestworldforustopronounce 3.What'sprobablythebesttitleforthestory?. A.Wordswithoutborders B.Themostpopularwords C.Wordsweoftenuse D.Mostwidelyusedwords
1分﹣NancyIreallydon'tknowhowtowritearticles. ﹣Don'tworry.amindmaptoorganizeyourideafirst. A.Used B.Touse C.Using D.Use
1分TheChinaInternationalImportExponewbusinessopportunitiesformanycountriesrecently. A.hasprovided B.hadprovided C.wouldprovide D.wasproviding
1分Nowtheairinourcityisthanitusedtobe.Somethingmustbedonetostopit. A.good B.bad C.worse D.better
4分 A.called B.consider C.possible D.type E.probably RootVegetables Wouldyouliketoeataroot?You1alreadyhave.Peopleandanimalseatmanykindsofroots.Mostrootsthatpeopleeatareusually2rootvegetables.Arootvegetableiswhatwecallvegetablesthatgrowunderground. Acarrotisone3ofrootvegetable.Itistheorangeediblerootofthecarrotplant.Manypeopleliketoputitinsalad.Aturnipisanotherrootvegetable.Itisamemberofthecabbagefamily.Turnipsareusuallyeatenboiledsteamedroastedfriedpickledorevenraw. Althoughsomepeopledonot4potatoestobeavegetabletheyarearootvegetable.Peopleliketoeatthemboiledfriedandmashedsweetpotatoesyamsbeetsandleeksaresomeotherrootvegetablesthatpeopleliketoeat. 1. 2. 3. 4.
12分ForhiseleventhbirthdayLinwasgivenagiftthatwouldshapehislife.OnthatdayhisfathertookhimtotheChildren'sActivityCentreandsaidhecouldchooseanycoursethatinterestedhim.TherewasjustonerequirementLinwouldhavetopromisetostudyitforatleastoneyear. TothatpointLinhadhadmanyhobbiesbutnonekepthisinterestformorethanaweekortwo.Hismumoncegavehimabagofstampstoencouragestampcollecting.Thathobbylastedaweek.Thenhisfathergotoncegavehimabagofstampstoencouragestampcollecting.Thathobbylastedaweek.ThenhisfathergothimsomepaintshopingthatLin'sartisticsidewouldshinethrough.Thosepaintswerenowunderhisbedsomestillunopened.ThistimeLin'sparentswouldlethimdecide. Lin'seyesmoveddownthenoticeboardthatlistedallthecoursesonoffer.HestoppedatPhotography.Helikedtheideaoftakingbeautifulpicturesbutthenoticesaidthateachstudentneededtheirowncamera.AlthoughLin'sfamilyweren'tpoortheyweren'tricheitherandacameracostalotofmoney.Hecontinuedlooking. ThenextcoursetocatchhiseyewasLanguageArt.Hedidn'tevenknowwhatthatmeant.Hisfatherexplainedthatittaughtpeoplehowtomakepublicspeeches.Linashyboytohimitcouldn'tbeworse. Thenhesawit.Cookingsoundedlikesomethinghe'dliketodo.Itwasinexpensiveandconvenientitcouldbedonealoneanditwasalsocreative. BasedonLin'shobbyhistoryhisdadhaddoubts疑惑butheagreed.Muchtohisparents'surpriseLinkepthispromise.HestudiedcookingattheCentreeverySaturdayandpracticedathomemakingdeliciousmealsforhisfamily.Everyonelookedforwardtobirthdayswhentheycouldeathiscakes.Lingotgreatsatisfactionfromthepleasurehisfoodbroughttoothers. Themonthsturnedtoyearsbuthishobbyneverbecamedifferentagain. NowLinisanadultandrunsawonderfulrestaurant.Whencustomerssaytheyenjoyhismealhestillgetsthesamepleasurehedidasachildandremembersthespecialgifthereceivedallthoseyearsago. 1.Whathobbydidn'tLintryaccordingtothepassage? A.Cooking B.Collectingstamps C.Painting D.Makingpublicspeeches 2.Whydidn'tLinchoosetostudyphotography? A.Itwastooexpensive B.Hewasnotverycreative C.Hehadnointerestinit D.Itwasnotofferedthatterm 3.TheunderlinedexpressioncatchhiseyeinParagraph4means. A.makehimexcited C.gethisattention B.causehimsurprise D.helphimseeclearly 4.WhichofthefollowingbestdescribesLin'sinterestincooking? A.Itonlylastedforashorttime. B.Itseemedtomatchhischaracter. C.It was forced on him by his parents. D.Itdevelopedslowlyovermanymonths. 5.WhydidthefatherhavedoubtswhenLinchosecooking? A.Linwasn'tgoodatcooking. B.Cookingwasn'tveryconvenient. C.Hedidn'tthinkLinwouldcontinue. D.Cookingwasn'tagoodhobbyforaboy. 6.What'sthebesttitleforthepassage? A.AStrictFather B.TheFunofCooking C.AChangeableBoy D.TheBirthdayGift
1分Peopleshoulddriveatlessthan40kilometreshouronthisroad. A.a B.an C.the D./
20分Writeatleast60wordsonthetopicWeekendorNot?accordingtotheinformationgiven.阅读以下内容并以这是汤姆的周末吗?为题写一篇不少于60个词的短文标点符号不占格. 如今很多孩子在父母的安排下没有了自己的周末如下图中的Tom请分析图中的这种现象并谈谈你的看法以WeekendorNot?为题写一篇不少于60个词的英语短文向Parents杂志投稿让父母们通过阅读你的文章能有所启发. 要求 1.简单描述Tom的周末状态提出你的具体想法并给出建议 2.短文中不得出现Tom以外的人名或任何校名及其他相关信息否则不予评分.
1分TheplaywasveryonBroadwayandeverybodyhasenjoyedit.success
15分人们常说要看中国五百年青岛北京要看中国五千年请西安.近几年世界四大文明古都之一西安成为千万人前来打卡的网红热门城市长安城青灰色的城墙映衬着绚丽的街灯阐释着西安年.最中国的传统文化精华与大国文化自信.假如你是Jim你受邀请浏览西安请以AvisittoXi'an为题写一篇短文介绍你到西安的所见所闻所想. 提示alonghistoryvisitlotsofinterestingplacesdeliciousfoodfriendlypeople 要求语句通顺意思连贯书写工整不少于70字开头已经给出不计入总字数. It'smyhonortobeinvitedtovisitXi'an.SoIhadachancetolearnaboutthishistoricandbeautifulcity.
1分Atpresentmoreandmorestudentschooseonlinecoursesandstudyby. A.they B.them C.their D.themselves
热门题库
更多
高一下学期物理
高三下学期数学
高三上学期数学
高一下学期英语
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
高三下学期物理
高三上学期物理