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已知函数f(x)=x3+ax2﹣x+c,且a=f′(). (1)求a的值; (2)求函数f(x)的单调区间; (3)设函数g(x)=[f(x)﹣x3]•ex,若函数g(x)在x∈[﹣3,2]上...
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高三上学期数学《》真题及答案
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已知函数fx=mÎZ为偶函数且f30且a¹1在区间[23]上为增函数求实数a的取值范围.
已知函数fx=ax3+bx+1的图像经过点1-1且在x=1处fx取得极值.求1函数fx的解析式2fx
.已知定义在R.上的函数fx满足fx+1=f1-x且在[1+∞上是增函数不等式fax+2≤fx-1对
[-3,-1]
[-2,0]
[-5,-1]
[-2,1]
已知函数fx=ax2+ax和gx=x-a其中a∈R.且a≠0.若函数fx与gx的图象的一个公共点恰好
已知a>0且a≠1下列函数中在区间0a上一定是减函数的是
f(x)=
f(x)=a
x
f(x)=log
a
(ax)
f(x)=x
2
﹣3ax+1
已知函数fx=logaax-1a>0且a≠11求fx的定义域2讨论fx的单调性3x为何值时函数值大于
已知二次函数fx=ax2+bxab为常数且a≠0满足条件fx-1=f3-x且方程fx=2x有两等根.
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﹣
已知命题P.fx=x3-ax在2+∞为增函数命题q:gx=x2-ax+3在12为减函数若p或q为真p
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=x3+ax2+bx+c且0<f-1=f-2=f-3≤3则实数的取值范围是_______
已知函数fx=x3+ax2+3x-9且fx在x=-3处取得极值那么实数a=.
已知函数fx=x3+ax2+bx+c且0
c≤3
3<c≤6
6<c≤9
c>9
已知函数fx=x3+ax2+bx+c且0<f-1=f-2=f-3≤3则
c≤3
3<c≤6
6<c≤9
c>9
已知函数fx=x3+ax2+bx+c且0
c≤3
3
6
c>9
已知函数fx=x3+ax2+bx+c在﹣∞﹣12+∞上单调递增在﹣12上单调递减当且仅当x>4时.f
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=x³+ax²+bx+c且0<f1=f2=f3≤3则c的取值范围是
c≤3
3<c≤6
6<c≤9
c≥9
已知函数fx=x5+ax3+bx-8且f-2=10那么f2等于
-26
-18
-10
10
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能够说明“在某个区间ab内如果函数y=fx在这个区间内单调递增那么f'x>0恒成立”是假命题的一个函数是.写出函数表达式和区间
You'vegotyourfancynewsuitcaseandyou'rereadytotakeitwithyouonyourtravelsacrosstheglobe. Yougettotheairportquicklymovingthroughthecrowdsontheunevenpavementrushingtocheckin.Thenyourheartsinkswhenyourealizeyournewsuitcasehasgotaseriouscaseofthewobbles摇晃. Whydoesthishappen? ScientistsfromtheUniversiteParis﹣DiderotinFranceinvestigatedthismatterandpublishedtheirfindingsinthesciencejournalProceedingsoftheRoyalSocietyA.Theyalsosuggestedsomesolutionstoovercomethismodern﹣dayproblem. Tolearnmoreabouttheissuetheyputasuitcaseonatreadmill跑步机andobservedwhathappened. Itwassoonnotedthatthewobblewasactuallyaresultofrepeatedactionsthatcausedthesuitcasetoswayfromsidetoside.Theydiscoveredthatifoneofthewheelsencounteredanobstaclesuchasasmallbumpitjumpedintotheairforjustamomentandthenbangedbackdowntotheground.Thatsecondactioncausedtheoppositewheeltoliftoffthegroundandthentobangbackdowncausingthefirsttoliftagainandsoon.Thisswayingincreasedastheluggagewaspulledalong. Thesuitcaseisafunwaytotackletheproblembutthestudywouldbethesameforanytrolleywithtwowheelsorblades桨叶SylvainCourrechduPontleadauthorofthestudytoldBBCNews.Soitwillbethesameforacaravan大篷车ormaybealsoforairplanes. Insteadofslowingdownwhenweseearockypartofthepaththescientistsrecommendeddoingtheexactoppositeandspeedingup.Thisisbecausegoingfastergivesthewheelslesstimetoriseandfallpreventingthecasefromswaying.Theyalsosaidthatreducingtheangleofthesuitcasebyloweringitshandletothegroundwouldhelpkeepitsteady. ThesefindingscouldhelpresearcherssimulateanddesignbetterrollingsuitcasesandotherpulledtrolleyssuchastowedtrailersCourrechduPontadded. Withthesemasterminds智者workingonperfectingoursuitcaseproblemswobblyluggagemaysoonbeathingofhistoryleavingustoenjoyourtravels. 1Themainpurposeofthefirsttwoparagraphsisto. A.showtheimportanceofagoodwheeledsuitcasefortravel B.leaduptothewobblingproblemofwheeledsuitcases C.describehowunstablewheeledsuitcasescanbe D.showthatwobblingcancausewheeledsuitcasestostopworking 2Accordingtothescientistswhenasuitcasemeetswithanobstacle. A.theswayingwillstopforamoment B.itstwowheelswilljumpintotheairatthesametime C.evenasmallobstaclecanleadtoaseriousdamage D.thereisaseriesofrepeatedactionsleadingtotheswaying 3Whatcanbedonetokeepasuitcasesteadyonanunevenpathaccordingtothetext? A.Slowdown. B.Pullthesuitcaseatafasterspeed. C.Raisethehandleofthesuitcase. D.Increasetheangleofthesuitcase. 4Accordingtothearticlethefindingscould. A.helpimprovethedesignofsuitcases B.solvethewobbleofsuitcasescompletely C.behelpfulintheadvancementoftreadmills D.beusedtodevelopbladesforboats
为调查某公司五类机器的销售情况该公司随机收集了一个月销售的有关数据公司规定同一类机器销售价格相同经分类整理得到下表 利润率是指一台机器销售价格减去出厂价格得到的利润与该机器销售价格的比值. Ⅰ从该公司本月卖出的机器中随机选一台求这台机器利润率高于0.2的概率 Ⅱ从该公司本月卖出的销售单价为20万元的机器中随机选取2台求这两台机器的利润率不同的概率 Ⅲ假设每类机器利润率不变销售一台第一类机器获利x1万元销售一台第二类机器获利x2万元…销售一台第五类机器获利x5依据上表统计数据随机销售一台机器获利的期望为Ex设=试判断Ex与的大小.结论不要求证明
WilliamButlerYeatsamostfamousIrishwriterwasborninDublinonJune131865.Hischildhood1theharmonythatwas2ofahappyfamily.LaterYeatsshockedhisfamilybysayingthatherememberedlittleofchildhoodbutitspain.Infacthe3excellenttasteinartfromhisfamily﹣bothhisfatherandhisbrotherwerepainters.Buthefinally4literature5dramaandpoetry. Yeatshadstrong6inthecomingofnewartisticmovements.Hesethimselfthe7taskinfoundinganIrishnationaltheatreinthelate1890s.Hisearlytheatricalexperiments8werenotreceived9atthebeginning.Hedidn'tloseheartandfinallyenjoyed10inhispoeticaldrama. 11withhisdramaticworksYeats'spoemsattractmuch12notice.Thesubjectmatterincludeslovenaturehistorytimeandaging.ThoughYeatsgenerallyreliedonverytraditionalformshebroughtmodern13tothem.Ashisliterarylife14hispoetrygrewfinerandricherwhichledhimtoworldwide15. Hehadnot16amajorpubliclife17winningtheNobelPrizein1923.Yethecontinuedwritingalmosttotheendofhislife.HadYeatsstoppedwritingatage40hewouldprobablynowbe18asaminorpoetforthereisnootherexampleinliteraryhistoryofapoetwho19hisgreatestworksbetweentheagesof50and75.AfterYeats'sdeathin1939W.H.Audenwroteamongothersthefollowinglines Earthreceivean20guest WilliamYeatsislaidtorest. LettheIrishvessel船lie. Emptiedofitspoetry. 1A.held B.lacked C.expected D.desired 2A.typical B.special C.awkward D.capable 3A.inherited B.developed C.abandoned D.formed 4A.carriedon B.decidedon C.puton D.basedon 5A.regularly B.instantly C.particularly D.finally 6A.desire B.energy C.access D.faith 7A.fresh B.stupid C.small D.difficult 8A.therefore B.however C.besides D.furthermore 9A.possibly B.honorably C.favorably D.doubtfully 10A.failure B.fame C.pleasure D.success 11A.Connected B.Occupied C.Compared D.Tired 12A.admiring B.amusing C.amazing D.envying 13A.potential B.sensibility C.possibility D.benefit 14A.finished B.produced C.created D.progressed 15A.praise B.spread C.recognition D.assessment 16A.enjoyed B.accepted C.purchased D.taken 17A.before B.since C.until D.after 18A.respected B.admired C.valued D.favored 19A.prohibits B.attempts C.recommends D.produces 20A.appealed B.advocated C.advanced D.honored
MysummerholswrCWOT.B4WEUSED2go2NY2CmybrohisGF&thr3﹣@KIDSFTF.ILNYitsgr8. Canyouunderstandthissentence?Ifyoucan'tdon'tfeeltoobadneithercouldthemiddleschoolteacherinEnglandwhoreceivedthisashomework.ThisisNetspeakthelanguageofcomputerizedcommunicationfoundontheInternetorcellphones.Tonewcomersitcanlooklikeacompletelyforeignlanguage. Schoolteachersandparentssaythisnewformofwritingisharming破坏theEnglishlanguage.Increasingspellingandgrammaticalmistakescanbeseeninstudents'writing.Theyfearthelanguagecouldbecomecorrupted面目全非的. Everyoneshouldjustrelaxsaylinguists语言学家.TheybelieveNetspeakisinfactmoreofagoodthing.DavidCrystalfromtheUniversityofWalesarguesthatNetspeakandInternetcreateanewlanguageuseandthealmostlostartofdiarywritinghasbeenpickedupagain.GeoffreyNurnbergfromStanfordUniversityagrees.Peoplegetbetteratwritingbywritinghesays.Kidswhoarenowdoingtextmessaginge﹣mailandinstantmessageswillwriteatleastaswellasandpossiblybetterthantheirparents. LinguistJamesMilroysaysforcenturiesitisbelievedwithoutexceptionthatyoungpeopleareharmingthelanguage.Andwhentoday'steenagersbecometomorrow'sparentstheytoowillthinkthisway.Milroyarguesthatlanguagesdonotandcannotbecomecorruptedtheysimplychangetomeetthenewneeds. HoweverNetspeakersdoagreethatitisimportanttoteachyoungpeoplehowtospeakandwriteStandardEnglish.CynthiaMcVeysaysIcanunderstandNetspeakworriesteachersandit'simportantthattheytelltheirpupilsthattextmessagingisforfunbutthatlearningtowriteproperEnglishisamustfortheirfuture. 1Whatisthepurposeofthefirstparagraph? A.Togivethemainidea. B.Toraiseaquestion. C.Tocompareanexample. D.Toleadinthetopic. 2WhocanunderstandtheNetspeakinEngland? A.Middleschoolteachers. B.Parents. C.Linguistics. D.Teenagers. 3WhobelievesNetspeakuserscanhelpimprovewriting? A.CynthiaMcVey B.DavidCrystal C.GeoffreyNurnberg D.JamesMilroy 4What'sJamesMilroy'sattitudetowardNetspeak? A.Positive. B.Negative. C.Doubtful. D.Worried. 5Whatcanbethebesttitleforthepassage? A.NetspeaktheLanguageontheInternet B.IsNetspeakHelpfulinLanguageLearning? C.IsNetspeakHarmingtheEnglishLanguage? D.NetspeakAdvantagesandDisadvantages
SeveralweeksagoourheadmasterMr.GauditoldusthatourschoolhadbeenchosentocompeteonSmartAleck﹣agameshowwhichmybestfriendCarlaandIbothlove.Carlahasagoodimagination1Iknowalotofhistory.Sowethoughtwe'dbegood2fortheteam. AfewdayslaterMr.Gaudiheldameetingwitheveryoneinterestedinthe3.HetoldusthatSmartAleckusesafivememberteam.Healsosaidthatthreemorepeoplewouldbeneededasbackup替补.4fourtimesthatmanystudentswereatthemeeting.SoMr.Gaudisaidwewouldhavea5amongallthestudentspresentandthetop6scorerswouldbecometheteamandthebackup.Everybodyagreedthatthiswasa7waytodecide. Yesterdayallofthehopefulswenttothedininghallafterschool.Wewouldhaveto8thestartingline﹣up阵容.Mr.Gaudiactedasthe9.Afteracoupleofhoursallthe10ontheteamweresetexceptone.CarlaandI11forthatlastposition.Wehadtoholdaone﹣on﹣onecompetition12thetwoofus.Thewinnerwouldbeontheteamandtheloserwouldbethe13. Midwaythroughourtwo﹣personcompetitionIwasstartingtopullahead.14IsawthelookonCarla'sface.IwaitedforasecondandknewwhatIhadtodo.AsmuchasIwantedtobeonSmartAleckCarlawanted15evenmore.SostartingwithmynextquestionIheldbackandletCarla16justbyalittlebit.Herexpressionasshe17shewouldbeontheshowmadeupformynotbeingontheteam.AndsinceIwillgoasbackupI'llstillhavethe18ofseeingtheshowupclose. WasI19bynottryingashardasIcould?Idon'tthinkso.NoonenoticedandCarlaandIdidn't20it.Itwon'thurttheteambecauseCarlawillbeaverygoodcompetitorontherealshow.Ithinkthatmakingmybestfriendhappywastherightthingtodo. 1A.but B.or C.so D.and 2A.pairs B.choices C.leaders D.fans 3A.course B.work C.play D.show 4A.Luckily B.Unluckily C.Importantly D.Hopefully 5A.direction B.discussion C.competition D.conversation 6A.five B.three C.two D.eight 7A.special B.hard C.funny D.fair 8A.decide B.draw C.push D.make 9A.headmaster B.coach C.host D.headteacher 10A.places B.rules C.names D.orders 11A.tied B.clapped C.cried D.returned 12A.of B.on C.between D.among 13A.backup B.audience C.cheerleader D.member 14A.Still B.Never C.Then D.Again 15A.us B.it C.me D.her 16A.wait B.turn C.move D.win 17A.accepted B.realized C.considered D.refused 18A.laughter B.sadness C.fun D.change 19A.coming B.refusing C.helping D.cheating 20A.mean B.plan C.regret D.say
在△ABC中角ABC的对边分别为abca=3. Ⅰ求c的值 Ⅱ若D为BC边上的点并且求∠ADB.
假如你是李华你的英国笔友Peter来信说近期要来北京希望你为他设计一个旅行计划推荐一些有中国特色的活动.请根据以下提示写一封回信.内容要点 TravelPlan 注意1.开头语和结束语已经为你写好不计入总词数2.可适当增加细节以使行文连贯 3.文中不能出现考生真实个人信息 4.词数100左右. DearPeter I'mhappytohearyou'recomingtoBeijing. Lookingforwardtomeetingyousoon! Yours LiHua
执行如图所示的程序框图输出的s值为
Theideaofturningrecycledplasticbottlesintoclothingisnotnew.Duringthelastfiveyearsalargenumberofclothingcompaniesbusinessesandenvironmentalorganizationshavestartedturningplasticsintofabrictodealwithplasticpollution.Butthere'saproblemwiththismethod.Researchnowshowsthatmicrofiberscouldbethebiggestsourceofplasticinthesea. Dr.MarkBrowneinSantaBarbaraCaliforniahasbeenstudyingplasticpollutionandmicrofibersfor10yearsnow.Heexplainsthateverytimesyntheticclothesgointoawashingmachinealargenumberofplasticfibersfalloff.Mostwashingmachinescan'tcollectthesemicrofibers.Soeverytimethewatergetsoutofawashingmachinemicrofibersareenteringthesewersandfinallyendupinthesea. In2011Brownewroteapaperstatingthatasinglepieceofsynthetic合成的clothingcanproducemorethan1900fibersperwash.Brownecollectedsamplesfromseawaterandfreshwatersitesaroundtheworldandusedaspecialwaytoexamineeachsample.Hediscoveredthateverysinglewatersamplecontainedmicrofibers. Thisisbadnewsforanumberofreasons.Plasticcancauseharmtosealifewheneaten.Studieshavealsoshownthatplasticcanabsorbotherpollutants. Basedonthisevidenceitmayseemsurprisingthatcompaniesandorganizationshavechosentoturnplasticwasteintoclothingasanenvironmentalsolution.EventhoughthesciencehasbeenaroundforawhileBrowneexplainsthathe'shadadifficulttimegettingcompaniestolisten.Whenheaskedwell﹣knownclothingcompaniestosupportBenignbyDesign﹣hisresearchprojectthatseekstogetclothesthathaveabadeffectonhumansandtheenvironmentoutofthemarketBrownedidn'tgetasatisfyinganswer.Onlyonewomen'sclothingcompanyEileenFisherofferedBrownefunding. 1Whathashappenedduringthepastfiveyears? A.Fabrichasbecomemuchstronger. B.Plasticpollutionhasbeenlessserious. C.Manyplasticbottleshavebeenreused. D.Microfibershavebeengreatlyimproved. 2WhatdoesBrownethinkofwashingsyntheticclothes? A.Itisaddingmicrofiberstotheclothes. B.Itisworseningenvironmentalproblems. C.Itismakingsyntheticclotheslastlonger. D.Itisdoinggreatdamagetowashingmachines. 3WhatcanbeinferredaboutBrowne'sBenignbyDesignresearchproject? A.Ithasachievedgreatsuccess. B.Ithasn'tgotanythingdone. C.Itisknowntoveryfewpeople. D.Itisfacingsomedifficulties. 4What'sthebesttitleforthetext? A.It'simportanttolearntorecycle B.It'snevereasytosolvepollutionproblems C.Recycledplasticclothingsolutionorpollution? D.Arehumanbeingsmovingforwardorbackward?
ManypeoplebelievethatthereissometruthinthesayingLaughteristhebestmedicine.1Laughterhelpsrelievepainstrengthentheimmunesystemandreducestress.Laughterstimulates激发hormoneswhichmakeusfeelhappy.Laughteralsoincreasestheflowofbloodthroughoutthebodyandhasbenefitswhicharesimilartotheonesyougetbydoingexercise. 2Childrenexposedtofunnyfilmsandcartoonsbeforemajormedicalproceduresareabletocopebetterwithpainandanxiety.3.Theseareprofessionalclownswhoaresenttohospitalsandwardstoentertainanddistractsickchildren. Laughtertherapyhasbecomeverypopularinrecentyearsandasaresultmoreandmorelaughterclubsarestartingtoopenupincitiesandtownsallovertheworld.Atalaughtersessionatrainedtherapistinstructsthegrouptoperformaseriesofexerciseswhicharedesignedtoproducelaughter.4Andittakesthemsometimetogetridoftheirinhibitions心理抑制.Theymightevenstartoffwithfakelaughterbutthisdoesn'tmatterbecauseourbodiescan'ttellthedifferenceandtheresultsarethesame.Moreoverlaughteriscontagious传染的.5 Sonexttimeyoufeelillstressedoutordepressedtrywatchingafunnyfilmortryrememberinganamusingincidentinyourlife.Youwillsoonfeelbetter. A.Ifonepersonstartsgigglingitisunavoidablethateveryoneelsewillbedrawnin. B.Laughterhelpsyoufocus. C.Thisfindinghasledtoso﹣calledclowndoctors. D.Infactresearchdonebyscientistshasshownthatlaughterhasalotofhealthbenefits. E.Laughtermakestheworldabetterandmorecolorfulplace. F.Somepeoplemayfindtheideaembarrassingatfirst. G.Usinglaughtertherapyinchildren'shospitalshasproventobeinvaluable.
假设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处错误每句中最多有两处错误.错误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. Inordertoencouragetheseniorstotakeexerciseandrelaxthemwearegoingtoorganizeamountain﹣climbingactivityinApril10.Weweretogatherattheschoolgateandstartat720a.m.bybusandgetbackat700p.m.We'llclimbMangshanMountaininthemorningonwhichtopwe'llhaveapicnicatthenoon.Intheafternoonwe'llbedividedintogroupandhaveafreetime.Remembertakephotosandmakenotesforthephotoexhibitionortheessaycontesttobeheldlateatourschool.Besidestakingyourlunchanddrinkingwaterwithyou.UnlessyouwanttojoinpleasecometoStudents'UnionandsignupbeforeApril5.
Textingwhilecrossingthestreetwillsoon1baninHonoluluHawaii.FromOctober2youcouldbefinedifyoustepintoaHonolulustreetwhilelookingatyourphone.HonoluluisthefirstmajorU.S.citythatpassedalaw3saysNopedestrianshallcrossastreetorhighwaywhileviewingamobileelectronicdevice. Thelaw4includeallelectronicdeviceswithscreenscellphonestabletsgamingdevicesdigitalcamerasandlaptopcomputers.Thelawdoespermit5exception.Pedestriansmayusesuchdevicesinthestreettocallemergencyservicesandrescueworkerssuchasfirefightersandpolice6office. 7hopeitwilllowerthenumberofpeoplehitand8killbycarsinthecity.PedestriansdeathsinAmericahavebeencontinuouslyincreasingastheuseofcellphonesrises.Honoluluhas9muchpedestrianshitincrosswalksthanalmostanyothercityinAmerica.Thenumberofpedestriandeathsin201610riseto600011%higherthan2015.
不等式kx≥x>0恒成立则k的最小值为
OnNovember7LewisPughcompletedaone﹣kilometerswiminthefreezingwatersofKingEdwardCoveoffSouthGeorgiainAntarctica.Hewaswearingonlyhisswimmingglassescapandspeedos! Pughisanadvocateforouroceansandseasworkingtoprotecttheseecosystemwiththeirlargediversityofmarinelife.Whenaskedwhyhedoesn'twearawetsuitLewissaysIaskworldleaderstodoeverythingtheycantoprotectouroceans.Sometimesthestepstheyneedtotakearedifficultandunpopular.IfI'maskingthemtobecourageousImustalsobe.Swimminginawetsuitwouldnotsendtherightmessage. IttookPughabout19minutestocompletetheone﹣kilometerswiminAntarcticawherethewateraveragedabout1.6degreesCelsius.Hesaysthathisbodycanonlytolerateabout20minutesinthefreezingwatersbeforeitstartsshuttingdown.Asheswimshisbodytemperaturesteadilydropswhichinturncauseshismusclecontroltodropslowinghimdown.Whenheisdonewithhisswimhissupportteamrusheshimtoahotshowerandittakesalmostanhourforhisbodytemperaturetoreturntonormal. DoctorsandPughcautionthatonemustreceivemonthsoftrainingtoswiminsuchcoldwaters.Evenexpertswimmerswhoareunusedtofreezingwatercandrownwithinminutesbecauseofthephysicalshockexperiencedbythebody.Pughsayshetrainedforsixmonthsbeforethisswim. ThisisnotthefirsttimethatLewishasswumindangerousconditions.In2007heswamonekilometerintheNorthPoletodrawattentiontothemeltingArcticiceduetoclimatechange.In2015heswamintheBayofWhalesinAntarctica'sRossSeaaspartofhissuccessfulcampaigntohelpsetupamarinereservethere. 1WhydidLewisPughswimwithoutawetsuit? A.Toswimfaster. B.Toshowhisbravery. C.Tobuilduphisbody. D.Towinpublicattention. 2WhatdoestheunderlinedworditinParagraph3referto? A.Hisbody. B.Thewater. C.Hisbodytemperature. D.Thewatertemperature. 3What'sPugh'sadviceaboutswimminginfreezingwaters? A.Onemustbefullyprepared. B.Oneshouldbeexpertatswimming. C.Oneshouldbereadytotakeonchallenges. D.Onemustbeusedtolong﹣distanceswimming. 4Whatmaybethebesttitleforthetext? A.LewisPughswimmingforacause B.Howtosurviveaswimincoldwaters C.Howtoprepareforextremeswimming D.LewisPughachievingtheimpossible
曲线C的极坐标方程为Cρ2=直线的参数方程为t为参数 1写出C的直角坐标方程与l的普通方程 2直线l与曲线C相交于两点AB设点M0﹣1求的值.
1WhenyoutakeReadingintheDigitalAgeyouwill. A.walkintodifferentpeople'slife B.learnwaysofunderstandingtexts C.getbetteratcomputerskills D.shareopinionswithliteraryscholars 2WhowillhelpstudentsbetterunderstandthethemesofShakespeare'splays? A.Actors. B.Scholars. C.Historians. D.Videotutors. 3WhatcanpeoplelearnfromTheEuropeanDiscoveryofChina? A.China'sdiscoveryoftheWest. B.TheriseandfalloftheQingDynasty. C.TheimportanceoftheSilkRoad. D.China'sinterestinWesterntravellers. 4Whatarethesubjectsoftheseonlinecourses? A.Scienceandhistory. B.Mediaandhealth. C.Natureandenvironment. D.Languageandculture. 5Inwhichwaydothethreecourseshaveincommon? A.Theyareaimedatstudents. B.Theyareprovidedforfree. C.Eachlasts6weeks. D.Eachtakes2hoursperweek.
已知椭圆Ma>b>0的长轴长为6且经过点过点P并且倾斜角互补的两条直线l1l2与椭圆M的交点分别为BC点B在点C的左侧点E﹣70.Ⅰ求椭圆M的方程Ⅱ求证四边形PEBC为梯形.
过点M20的直线l与抛物线Cy2=2pxp>0交于AB两点O为坐标原点OA⊥OB.1求p的值2若l与坐标轴不平行且A关于x轴的对称点为D求证直线BD恒过定点.
设{an}是等比数列且a2a4=a5a4=27则{an}的通项公式为.
WhenHuangLizhitookherfirstclassinAfricansociologyattheUniversityoftheWitwatersrandinSouthAfricainFebruaryherprofessoraskedherandherclassmateswhatimpressesthemmostwhenitcomestoAfrica. UnexpectedlyHuang31foundthatwordslikepovertyandsafari﹣negativewordsthatwereoftenassociatedwiththecontinentinmediareports﹣werethekindoftermsherAfricanclassmatesdidn'twanttohear.InsteadtheypreferredtohearthequestionansweredinthiswayAfricaisthecradleofhumankindandAfricansarepassionateandgenerous. Apparentlytherearesomemisunderstandingsbetweenus.It'struethatwithincidentsliketheEbolaoutbreakinWesternAfricaandtheemergence出现ofpiratesoffthecoastofSomaliahittingthenewsit'seasyforustokeepforgettingthatAfricahasoneoftheworld'soldestcivilizations﹣Egyptbornbytheworld'slongestrivertheNile.TheproofisintheGreatPyramidofGizaandtheGreatSphinxofGizawhicharebothpopularamongtourists.AndthetombsofancientEgypthavealsobecomeendlesssourcesfortheliteratureandfilmindustries. WhenitcomestothenaturalenvironmentofAfricaourmisunderstandingsareonlybigger.Butthetruthisthatinsteadofbeingextremelyhotallyearandcoveredbydesertthecontinenthaslargeareasofsavannas稀树草原wherelionsgiraffesandzebraslivethesnowcappedKilimanjaro﹣thehighestmountaininAfrica﹣andeventhickforestontheislandofMadagascar.Thesemisunderstandingsareoneofthereasonswhythe2018BeijingSummitoftheForumonChina﹣AfricaCooperationwasheldonSept3and4﹣tounderstandeachotherbetter. IndeedonlybyvisitingAfricaherselfdidHuangseetheconvenientlivingconditionstheamazingnaturalbeautyandthefriendlypeople.InhereyesherclassmateswereashopefulaboutthefutureoftheirowncountriesastheywereaboutAfricaasawholeandtheywerequicktodemonstrateboththeirstrongwillandactivity.AtthatmomentIknewexactlywhattheywanted﹣theywantedtheirculturetoberespected. 1Whichofthefollowingbestexplainscradleunderlinedinparagraph2? A.Asmallbedforbabies. B.Abaskettoholdsomething. C.Aplaceforpeopletorelaxthemselves. D.Aplacewheresomethingimportantbegan. 2WhatcanweinferaboutAfricaaccordingtothepassage? A.Itisveryhotalltheyearround. B.It'snotasafecontinenttolivein C.It'sdifferentfromwhatweimagine. D.Itisboundtohaveabrightfuture 3WhichofthefollowingwouldHuangagreewith? A.Toseeistobelieve B.Thinktwicebeforeyoudo C.Amissisasgoodasamile D.Don'tjudgeapersonbyhisappearance 4Whatcanbeasuitabletitleforthetext? A.ValuingaCulture. B.UnderstandingAfrica. C.PayingaVisittoAfrica. D.DiscoveringaContinent.
PM2.5是衡量空气污染程度的一个指标为了了解A市空气质量情况从2018年每天的PM2.5值的数据中随机抽取40天的数据其频率分布直方图如图所示.将PM2.5值划分成区间[0100[100150[150200[200250]分别称为一级二级三级和四级统计时用频率估计概率. 1根据2018年的数据估计该市在2019年中空气质量为一级的天数 2按照分层抽样的方法从样本二级三级四级中抽取6天的PM2.5数据再从这6个数据中随机抽取2个求仅有二级天气的概率.
直线2x+y﹣3=0与圆x2+y2﹣2x﹣2y=0相交于AB两点O为坐标原点则.
在平面直角坐标系中记曲线C为点P2cosθ﹣12sinθ+1的轨迹直线x﹣ty+2=0与曲线C交于AB两点则|AB|的最小值为
假定你是李华是你校音乐节的组织者之一.请你用英语给美国笔友Mike写一封邮件请他介绍一下他们学校的音乐活动并对你校音乐的组织提出建议. 注意1.词数100左右 2.可以适当增加细节以使行文连贯.
GreatholidaysinEurope! Doyoulikethebeachbutwantabitmore? ThencomeonanActiveBeachholidayatoneofourcentersinGreeceTurkeyorCroatia.Allthecentersarenearbeautifulbeachesandalloffersailingwindsurfingorwaterskiingwithourexcellentinstructors.Forachangefromthewateryoucanalsobookashorttriptoanearbyvillageandvisitthecolorfulmarketsoreatinalocalrestaurant.Attheendofthedayrelaxinyourhotelroomordancethenightawayatoneofouropen﹣airclubs. WhowasKingArthur?Wheredidhelive? Joinusonafive﹣dayUKRoadTripholiday.ImaginelifehundredsofyearsagoaswevisitancientStonehengeRomanBathandTintagelCastlethehomeofKingArthur.Learnthehistoryoftheseinterestingplacesfromyourguideasyoutravelinoneofourfamousbluecoaches.Intheeveningswestopatsomeofthebestyouthhostelsinthecountry.Theyhaveeverythingyouneedyoudontevenneedtopackasleepingbag! Areyouboredwiththeusualholidays?Doyouwanttodosomethingyoureallyenjoy? ThenFameCampisforyou!SpendaweekatHightreeHouseinYorkshireandlearnhowtoplaythepianoviolinandguitar!Bringyourtentandstayatacampsitenearthehouse.Attheendoftheweektryyournewskillsinaliveperformance. Howmanycountriescanyouseein21days? OnourExploreEuropeholidayyoucanseeten!Learnaboutthemfromourbestguidesasyouwatchthemgopastfromthewindowofanair﹣conditionedcoachandstayatsomeofEurope'stopcampsitesontheway.Ofcoursewe'llalsohavetimetodotheimportantthingssuchasvisitingtheEiffelTowerinParisthehistoricSistineChapelinVaticanandeatingappleѕtrudеlіnVіеnna. Formoreinformationaboutanyoftheseholidayscall08453334523orvisitwww.comewithusuk.com. 1TouristswhogoonanActiveBeachholiday. A.candosomewatersports B.cancookbythemselves C.willenjoyanopen﹣airconcert D.shouldbringtheirownsleepingbags 2IfyouwanttoknowmoreaboutTintagelCastlewhichholidayshouldyoutake? A.FameCamp. B.ActiveBeach. C.UKRoadTrip. D.ExploreEurope. 3WhatcanwelearnaboutExploreEurope? A.Itlasts10days. B.Itisacoachtour. C.Itisaself﹣guidedtour. D.Itgoespast21countries.
已知函数y=sinωxω>0在0上有最大值没有最小值则ω的取值范围为.
已知集合P={012}Q={x|x<2}则P∩Q=
若不等式组可表示为由直线围成的三角形区域包括边界则实数a的范围是
过椭圆C+=1a>b>0的左焦点F的直线过C的上端点B且与椭圆相交于另一个点A若|BF|=3|AF|则C的离心率为.
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