首页
试卷库
试题库
当前位置:
X题卡
>
所有题目
>
题目详情
已知函数f(x)=|x+2a|+|x﹣a|. (1)当a=1时,求不等式f(x)≥4﹣|x+2|的解集; (2)设a>0,b>0,且f(x)的最小值为t.若t+3b=3,求的最小值.
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
已知函数fx=x2-2ax+2当x∈[-1+∞时fx≥a恒成立则a的取值范围________.
已知函数fx=5|x|gx=ax2﹣xa∈R.若f[g1]=1则a=
1
2
3
﹣1
已知函数fx=xx∈[-18]函数gx=ax+2x∈[-18]若存在x∈[-18]使fx=gx成立则
已知函数fx=﹣x3+ax2+bx+c图象上的点P1f1处的切线方程为y=﹣3x+1函数gx=fx﹣
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
已知了函数fx=ax2+3x-4gx=ax2+2x-2a>0且a≠1若fx>gx试确定x的范围.
已知函数fx=-x2+ax-lnx-1Ⅰ当a=3时求函数fx的单调区间Ⅱ函数fx在24上是减函数求实
已知函数fx=5|x|gx=ax2-xa∈R.若f[g1]=1则a=
1
2
3
-1
已知函数fx=ax2+lnxa∈R.Ⅰ当a=2时求fx在区间[ee2]上的最大值和最小值Ⅱ如果函数g
已知fx=lnx+ax2﹣ax+5a∈R..1若函数fx在x=1处有极值求实数a的值2若函数fx在区
已知函数fx=3ax-2x2+lnxa为常数 1当a=l时求fx的单调区间 2若函数fx在区间[1
已知a∈R函数fx=-x2+axex.1当a=2时求函数fx的极大值2若函数fx在-11上单调递增求
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
已知函数fx=lnx-axa∈R.1求函数fx的单调区间2当a>0时求函数fx在[12]上的最小值.
已知二次函数fx=x2-ax+4若fx+1是偶函数则实数a的值为
-1
1
-2
2
已知函数fx=x2+4ax+2a+6.1若函数fx的值域为[0+∞求a的值2若函数fx的函数值均为非
已知a∈R函数fx=-x2+axexx∈R.1当a=2时求函数fx的单调区间2若函数fx在-11上单
已知函数fx=|x-a|gx=x2+2ax+1a为正常数且函数fx与gx的图像在y轴上的截距相等.1
已知函数fx=cosx+ax2-1a∈R..1求证函数fx是偶函数2当a=1求函数fx在[-ππ]上
已知函数fx=x2+2ax+2x∈[-55].1当a=-1时求函数fx的最值2若fx是单调函数求实数
热门试题
更多
世博会期间某班有四名学生参加了志愿工作.将这四名学生分配到ABC三个不同的展馆服务每个展馆至少分配一人.若甲要求不到A馆则不同的分配方案有
Duringtherosyyearsofelementaryschool小学Ienjoyedsharingmydollsandjokeswhichallowedmetokeepmyhighsocialstatus.Iwasthequeenoftheplayground.Thencamemytweensandteensandmeangirlsandcoolkids.TheyroseintheranksnotbybeingfriendlybutbysmokingcigarettesbreakingrulesandplayingjokesonothersamongwhomIsoonfoundmyself. Popularityisawell﹣exploredsubjectinsocialpsychology.MitchPrinsteinaprofessorofclinicalpsychologysortsthepopularintotwocategoriesthelikableandthestatusseekers.Thelikables'plays﹣well﹣with﹣othersqualitiesstrengthenschoolyardfriendshipsjump﹣startinterpersonalskillsandwhentappedearlyareemployedeverafterinlifeandwork.Thenthere'sthekindofpopularitythatappearsinadolescencestatusbornofpowerandevendishonorablebehavior. EnviableasthecoolkidsmayhaveseemedDr.Prinstein'sstudiesshowunpleasantconsequences.Thosewhowerehighestinstatusinhighschoolaswellasthoseleastlikedinelementaryschoolaremostlikelytoengage从事indangerousandriskybehavior. InonestudyDr.Prinsteinexaminedthetwotypesofpopularityin235adolescentsscoringtheleastlikedthemostlikedandthehighestinstatusbasedonstudentsurveys调查研究.Wefoundthattheleastwell﹣likedteenshadbecomemoreaggressiveovertimetowardtheirclassmates.Butsohadthosewhowerehighinstatus.Itclearlyshowedthatwhilelikabilitycanleadtohealthyadjustmenthighstatushasjusttheoppositeeffectonus. Dr.Prinsteinhasalsofoundthatthequalitiesthatmadetheneighborswantyouonaplaydate﹣sharingkindnessopenness﹣carryovertolateryearsandmakeyoubetterabletorelateandconnectwithothers. InanalyzinghisandotherresearchDr.PrinsteincametoanotherconclusionNotonlyislikabilityrelatedtopositivelifeoutcomesbutitisalsoresponsibleforthoseoutcomestoo.Beinglikedcreatesopportunitiesforlearningandfornewkindsoflifeexperiencesthathelpsomebodygainanadvantagehesaid. 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'tFinishLast B.TheHighertheStatustheBetter C.BetheBest﹣YouCanMakeIt D.MoreSelf﹣ControlLessAggressiveness
已知xy满足约束条件则z=2x﹣y的最大值为
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.
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.Above4000metersisthehighland17gravel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
在复平面上复数对应的点位于
ForCanaanElementary'ssecondgradeinPatchogueN.Y.todayisspeechdayandrightnowit'sChrisPalaez'sturn.The8﹣year﹣oldisthejokeroftheclass.Withshiningdarkeyesheseemslikethekindofkidwhowouldenjoypublicspeaking. Buthe'snervous.I'mheretotellyoutodaywhyyoushould…should…Christripsonthe﹣ldapronunciationdifficultyformanynon﹣nativeEnglishspeakers.HisteacherThomasWhaleyisnexttohimwhisperingsupport.…Votefor…me…ExceptforsomestumblesChrisisdoingamazinglywell.WhenhebringshisspeechtoaniceconclusionWhaleyinvitestherestoftheclasstopraisehim. AsonofimmigrantsChrisstartedlearningEnglishalittleoverthreeyearsago.Whaleyrecalls回想起howatthebeginningoftheyearwhencalledupontoreadChriswouldexcusehimselftogotothebathroom. LearningEnglishasasecondlanguagecanbeapainfulexperience.Whatyouneedisagreatteacherwholetsyoumakemistakes.IttakesalotforanystudentWhaleyexplainsespeciallyforastudentwhoislearningEnglishastheirnewlanguagetofeelconfidentenoughtosay‘Idon'tknowbutIwanttoknow.' Whaleygottheideaofthissecond﹣gradepresidentialcampaignprojectwhenheaskedthechildrenonedaytoraisetheirhandsiftheythoughttheycouldneverbeapresident.Theanswerbrokehisheart.Whaleysaystheprojectisaboutmorethanjustlearningtoreadandspeakinpublic.Hewantsthesekidstolearntoboast夸耀aboutthemselves. BoastingaboutyourselfandyourbestqualitiesWhaleysaysisverydifficultforachildwhocameintotheclassroomnotfeelingconfident. 1WhatmadeChrisnervous? A.Tellingastory. B.Makingaspeech. C.Takingatest. D.Answeringaquestion. 2Whatdoestheunderlinedwordstumblesinparagraph2referto? A.Improperpauses. B.Badmanners. C.Spellingmistakes. D.Sillyjokes. 3WecaninferthatthepurposeofWhaley'sprojectisto. A.helpstudentsseetheirownstrengths B.assessstudents'publicspeakingskills C.preparestudentsfortheirfuturejobs D.inspirestudents'loveforpolitics 4WhichofthefollowingbestdescribesWhaleyasateacher? A.Humorous. B.Ambitious. C.Caring. D.Demanding.
现在很多人喜欢在交流时使用网络语言包括拼音或者英文字母的缩写含有某种特定意义的数字以及形象生动的网络动画和图片.如886代表再见表示微笑等.就此现象你班最近举行了一场讨论会.请根据下面的提示写一篇短文介绍一下讨论的情况并发表自己的看法. 60%的同学认为 1.网络语言简洁可以节约时间加快交流 2.网络语言幽默活泼有助于表达思想. 40%的同学认为 1.网络语言荒诞有时难以理解 2.有些表达方式违背语法规则. 注意1.开头已经给出 2.参考词汇荒诞的ridiculous. NowadayswiththedevelopmentoftheInternetakindoflanguagecalledWebLanguagehascomeintobeing.
Itisnotimmediatelyclearthefinancialcrisiswillsoonbeover. A.since B.what C.when D.whether
Beingaparentisnotalwayseasyandbeingtheparentofachildwithspecialneedsoftencarrieswithextrastress. A.it B.them C.one D.him
Iamagoodmothertothreechildren.Ihavetriednevertoletmyprofessionstandinthewayofbeingagoodparent. Inolongerconsidermyselfthecenteroftheuniverse.Ishowup.Ilisten.Itrytolaugh.Iamagoodfriendtomyhusband.Ihavetriedtomakemarriagevows誓约meanwhattheysay.Iamagoodfriendtomyfriendsandtheytome.Withoutthemtherewouldbenothingtosaytoyoutoday. Sohere'swhatIwanttotellyoutodaygetalife.Areallifenotadesireofthenextpromotion 提升thebiggerpaycheckandthelargerhouse. Getalifeinwhichyouarenotalone.Findpeopleyouloveandwholoveyou.Andrememberthatloveisnotleisure休闲butwork.Pickupthephone.Sendanemail.Writealetter.Andrealizethatlifeisthebestthingandthatyouhavenobusinesstakingitforgranted. Itissoeasytowasteourlivesourdaysourhoursandourminutes.Itissoeasytoexistinsteadofliving.Ilearnedtolivemanyyearsago.Somethingreallyreallybadhappenedtomesomethingthatchangedmylife.IfIhadmychoiceitwouldneverhavebeenchangedatall.AndwhatIlearnedfromitiswhattodayseemstobethehardestlessonofall. Ilearnedtolovethejourneynotthedestination.IlearnedtolookatallthegoodintheworldandtriedtogivesomeofitbackbecauseIbelievedinitcompletelyandtotally.AndItriedtodothatinpartbytellingotherswhatIhadlearned. Bytellingthemthisreadinthebackyardwiththesunonyourface.Learntobehappy.Andthinkoflifeasadeadlyillnessbecauseifyoudoyouwilllivewithjoyandpassion激情asitoughttobelived. 1Thebesttitleofthispassageprobablyis. A.Loveyourfriends B.Liveareallife C.Don'twastetime D.Beagoodmotherandwife 2Howdidtheauthorformherviewoflife? A.Throughsocialexperience. B.Bylearningfromherfriends. C.Throughanunfortunateexperience. D.Fromherchildrenandhusband. 3BytheunderlinedsentenceItissoeasytoexistinsteadofliving.inthefifthparagraphtheauthorreallymeansthatpeopletendto. A.makealivingratherthanliveareallife B.workratherthanenjoylife C.wastealotinlife D.forgetthemostimportantlessoninlife 4What'stheauthor'sattitudetowardwork? A.Doitwelltoserveothers. B.Earnenoughmoneytomakelifebetter. C.Tryyourbesttogethigherpositionandpay. D.Don'tletitaffectyourreallife. 5Itcanbeinferredfromthepassagethat. A.theauthorisasuccessinpersonallife B.theauthordoesn'ttryherbesttoworkwell C.theauthorspendsallhertimecaringforherchildren D.theauthorlikestravelingverymuch
Theyhowmuchthepartywouldcost. A.workedout B.turnedout C.figuredout D.pointedout
已知随机变量X满足DX=3则D3X+2=.
Thankyouforallyourhardworklastweek.Idon'tthinkweitwithoutyou. A.canmanage B.couldhavemanaged C.couldmanage D.canhavemanaged
已知复数z满足1+iz=1﹣7ii是虚数单位则|z|=.
﹣Ithinkheistakinganactivepartinsocialwork. ﹣Iagreewithyou. A.inaway B.ontheway C.bytheway D.intheway
已知函数fx=x3﹣3x. Ⅰ求函数fx的极值 Ⅱ若关于x的方程fx=k有3个实根求实数k的取值范围.
已知集合A={﹣13}B={2a2}若A∪B={﹣1329}则实数a的值为
函数fx=x2•cosx在的图象大致是
我国古代数学名著九章算术的论割圆术中有“割之弥细所失弥少割之又割以至于不可割则与圆周合体而无所失矣.”它体现了一种无限与有限的转化过程.比如在表达式1+中“…”即代表无数次重复但原式却是个定值它可以通过方程1+=x求得x=.类比上述过程则=
已知函数fx=. 1判断fx在0+∞的单调性 2若x>0证明ex﹣1lnx+1>x2.
某几何体的三视图如图所示则该几何体的体积为
已知x+1n=a0+a1x﹣1+a2x﹣12+a3x﹣13+…+anx﹣1nn≥2n∈N* 1当n=5时求a0+a1+a2+a3+a4+a5的值. 2设Tn=b2+b3+b4+…+bn.试用数学归纳法证明当n≥2时.
已知双曲线﹣=1a>0b>0的一条渐近线方程为y=xP为该双曲线上一点F1F2为其左右焦点且PF1⊥PF2|PF1|•|PF2|=18
已知函数fx=sinωx+φω>0|φ|<在区间[﹣]上为单调函数且f=f=﹣f﹣则函数fx的解析式为
已知随机变量X的概率分布列如表所示且X的数学期望EX=6则
给定下列两种说法①已知abc∈R命题“若a+b+c=3则a2+b2+c2≥3”的否命题是“若a+b+c≠3则a2+b2+c2<3”②“∃x0∈R使fx0>0”的否定是“∀x∈R使fx≤0”则
设函数fx=|x+1|+|x﹣a|x∈R 1当a=2时求不等式fx>5的解集 2对任意实数x都有fx≥3恒成立求实数a的取值范围.
已知自然数x满足3Ax+13=2Ax+22+6Ax+12则x=
已知ab为两条不同的直线αβ为两个不同的平面则 ①若a⊥αb⊥β且α∥β则a∥b②若a⊥αb∥β且α∥β则a⊥b ③若a∥αb⊥β且α⊥β则a∥b④若a⊥αb⊥β且α⊥β则a⊥b 其中真命题的个数是
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