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已知函数,点O为坐标原点,点,向量=(0,1),θn是向量与的夹角,则使得恒成立的实数t的取值范围为 .
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高三下学期数学《》真题及答案
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在空间直角坐标系O.-xyz中平面OAB的一个法向量为n=2-21已知点P.-132则点P.到平面O
已知函数点O.为坐标原点点向量=01是向量与的夹角则使得恒成立的实数t的最小值为.
已知点P.2cosα2sinα和Q.a0O.为坐标原点.当α∈0π时.1若存在点P.使得OP⊥PQ求
设向量a=a1a2b=b1b2定义一种向量积a⊗b=a1b1a2b2已知向量m=2n=0点P.xy在
设函数A0为坐标原点An为函数y=fx图象上横坐标为nn∈N*的点向量向量i=10设θn为向量an与
5.00分已知函数点O为坐标原点点Annfnn∈N*向量=01θn是向量与的夹角则的值为.
已知O.为坐标原点向量若在x轴上存在一点P.使有最小值则点P.的坐标为
(-3,0)
(2,0)
(3,0)
(4,0)
设函数为坐标原点为函数图象上横坐标为nn∈N*的点向量向量设为向量与向量的夹角满足<的最大整数是__
设向量a=a1a2b=b1b2定义一种向量积a⊗b=a1b1a2b2已知向量m=n=点P.xy在y=
在直角坐标平面中已知点P112P2222P3323Pnn2n其中n是正整数对平面上任一点Ao记A1为
已知直线Ax+By+C.=0的方向向量为B﹣A现有常数m>0向量=01向量=m0经过点Am0以λ+为
设函数fx=x+A0为坐标原点An为函数y=fx图象上横坐标为nn∈N*的点向量an=向量i=10设
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已知点P的坐标为mnO为坐标原点.连接OP将线段OP绕O点顺时针旋转90°得OP1则点P1的坐标为.
已知点M.10N.01P.21Q.1y且∥求y的值并求出向量的坐标.
在空间直角坐标系O.-xyz中平面OAB的一个法向量为n=2-21已知点P.-132则点P.到平面O
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已知向量与向量a=1-2的夹角为π||=2点
的坐标为(3,-4),则点
的坐标为( ) A.(1,0) B.(0,1)
(5,-8)
(-8,5)
已知O.为坐标原点向量若在x轴上存在一点P.使有最小值则点P.的坐标为
(-3,0)
(2,0)
(3,0)
(4,0)
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Mycolortelevisionhasgivenmenothingbutaheadache.IwasabletobuyitalittleoverayearagobecauseIhadmyrelativesgivememoneyformybirthdayinsteadofalotofclothesthatwouldn'tfit.IletasalesclerkfoolmeintobuyingadiscontinuedmodelIrealizedthisadaylatewhenIsawnewspaperadvertisementsforthesetatseventy﹣fivedollarslessthanIhadpaidThesetworkedsobeautifullywhenIfirstgotithomethatIwouldkeepitonuntilstationssignedoffforthenightFortunatelyIdidn'tgotanychannelsshowingall﹣nightmoviesorIwouldneverhavegottentobed. ThenIstarteddevelopingaproblemwiththesetthatinvolvedstatic静电noise.Forsomereasonwhencertainshowsswitchedintoacommercialaloudnoisewouldsoundforafewseconds.GraduallythisnoisebegantoappearduringashowandtogetridofitIhadtochangetoanotherchannelandthenchangeitback.SometimesthistechniquewouldnotworkandIhadtopickupthesetandshakeittoremovethesound.Iactuallybegantobuildupmyarmmuscles肌肉shakingmyset. WhenneitherofthesemethodsremovedthestaticnoiseIwouldsithelplesslyandwaitforthenoisetogoaway.AtlastIendeduphittingthesetwithmyfistanditstoppedworkingaltogether.Mytriptotherepairshopcostme$62andthesetisworkingwellnowbutIkeepexpectingmoretrouble. 21.WhydidtheauthorsayhewasfooledintobuyingtheTVset? A.Hegotanoldermodelthanhehadexpected. B.Hecouldn'treturnitwhenitwasbroken. C.Hecouldhaveboughtitatalowerprice. D.Hefailedtofindanymovieshowsonit. 22.WhichofthefollowingcanbestreplacethephrasesignedoffinParagraph1? A.endedalltheirprograms B.providedfewerchannels C.changedtocommercials D.showedall﹣nightmovies 24.Howdoestheauthorsoundwhentellingthestory? A.Curious B.Anxious C.Cautious D.Humorous.
如图反比例函数y=x>0的图象经过矩形OABC对角线的交点M分别交ABBC于点DE.若四边形ODBE的面积为12则k的值为.
如图在菱形ABCD中已知AB=4∠ABC=60°∠EAF=60°点E在CB的延长线上点F在DC的延长线上有下列结论①BE=CF②∠EAB=∠CEF③△ABE∽△EFC④若∠BAE=15°则点F到BC的距离为2﹣2.则其中正确结论的个数是
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如图⊙O的直径AB垂直于弦CD垂足是点E∠CAO=22.5°OC=6则CD的长为
设ab是方程x2+x﹣2019=0的两个实数根则a﹣1b﹣1的值为.
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如图1在平面直角坐标系中抛物线y=﹣x2+bx+c经过点A﹣50和点B10. 1求抛物线的解析式及顶点D的坐标 2点P是抛物线上AD之间的一点过点P作PE⊥x轴于点EPG⊥y轴交抛物线于点G过点G作GF⊥x轴于点F当矩形PEFG的周长最大时求点P的横坐标 3如图2连接ADBD点M在线段AB上不与AB重合作∠DMN=∠DBAMN交线段AD于点N是否存在这样点M使得△DMN为等腰三角形若存在求出AN的长若不存在请说明理由.
如图在Rt△ABC中∠B=90°AB=5BC=12将△ABC绕点A逆时针旋转得到△ADE使得点D落在AC上则tan∠ECD的值为.
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ItwasmyfirstdayinHangzhoutheChinesecityfamousforitsnaturalbeautyandhistoryandIdidn'thavemuchtimetospare.Iwantedtosee1muchofthecityaspossibleinthetwodays2IwastoreturntoGuangzhou.Myfirsttaskwastodecidewheretogoand3togetthere.Itookoutmyguidebookinwhichtherewasalotofinformationaboutthecity'swell﹣knowntourist4attractandstartedtoread.Atthatmomentanattractiveyounglady5noticedmybookcameuptomeandintroduced6.ShesaidhernamewasMissBai.Shekindlyofferedtoshowme7thecity.Iwasdelightedandwasabouttoacceptherproposalwhenshesuggestedwefirst8gototheWestLakeandwalkalongtheBrokenBridge.IquitelikedtheideaofvisitingtheWestLakebutwasn'tsosureaboutcrossingtheBrokenBridge.9itwasbrokendidsheexpectmetojumpacross?AndIcouldn'tswimsoifIfellinthenIwoulddrown.ThatwasdefinitelynotanattractiveideasoIpolitelydeclinedherinvitation10closemybookandwalkedaway. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
如图在岷江的右岸边有一高楼AB左岸边有一坡度i=12的山坡CF点C与点B在同一水平面上CF与AB在同一平面内.某数学兴趣小组为了测量楼AB的高度在坡底C处测得楼顶A的仰角为45°然后沿坡面CF上行了20米到达点D处此时在D处测得楼顶A的仰角为30°求楼AB的高度.
已知函数. 1若x∈﹣1+∞求fx的最小值并指出此时x的值 2求不等式fx≥2x+2的解集.
Wheredoyougowhenyouwanttolearnsomething?Afriend?Atutor?Theseareall41acesoflearning.Butitmaywellbethatthelearningyoureallywant42somewhereelseinstead.Ihadthe43ofseeingthisfirsthandona44. Mydaughterplaysonarecreationalsoccerteam.Theydidverywellthisseasonandso45atournamentwhichnormallywasonlyformoreskilledclubteams.Thisledtosome46experiencesonSaturdayastheyplayedagainstteams47trained.Throughthefirsttwogamesher48didnotgetonseriousshotongoal.AsapparentI49seeingmydaughterplayingherbest50stilldefeated. ITseemedthatsomethingclickedwiththe51betweenSaturdayandSunday.Whenthey52fortheirSundaygametheywere53different.Theyhadbegunintegrate融合thekindsofplayandteamworktheyhad54thedaybeforeintotheir55.Theyplayedaggressivelyand56scoredagoal. It57methatplayingagainsttheotherteamwasagreat58momentforallthegirlsontheteam.Ithinkitisageneralprinciple.59isthebestteacher.Thelessonstheymaynotbe60whattheywouldhavegotteninschool.Butarecertainlymorepersonalandmeaningfulbecausetheyhadtoworkthemoutontheirown. 41.A.public B.traditional C.official D.special 42.A.passes B.works C.lies D.ends 43.A.dream B.idea C.habit D.chance 44.A.trip B.holiday C.weekend D.square 45.A.won B.entered C.organized D.watched 46.A.painful B.strange C.common D.practical 47.A.less B.poorly C.newly D.better 48.A.fans B.tutors C.class D.team 49.A.imagined B.hated C.avoided D.missed 50.A.if B.or C.but D.as 51.A.girls B.parents C.coaches D.viewers 52.A.dressed B.showedup C.madeup D.planned 53.A.slightly B.hardly C.basically D.completely 54.A.seen B.known C.heard D.read 55.A.styles B.training C.game D.rules 56.A.even B.still C.seldom D.again 57.A.confused B.struck C.reminded D.warned 58.A.touching B.thinking C.encouraging D.learning 59.A.Experience B.Independence C.Curiosity D.Interest 60.A.harmfulto B.mixedwith C.differentfrom D.appliedto.
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BRITAINisapopulartouristplace.Buttoursofthecountryhaveprosandcons. Goodnews Freemuseums.Nochargeforoutstandingcollectionsofartandantiquities. Popmusic.Britainistheonlycountrytorival与……比敌theUSonthisscore. Blackcabs.Londontaxidriversknowwheretheyaregoingevenifthereareneverenoughofthematweekendsornight. Choiceoffood.VisitorscanfindeverythingfromEthiopiantoSwedishrestaurants. Fashion.NotonlydofashionfollowerslovedeeplyandrespecthighlybrandnamessuchasVivienneWestwoodAlexanderMcQueenstreetstylesarejustlylovedtoo. Badnews Poorservice.It'spartoftheimageoftheplace.PeoplecandineoutontherudenesstheyhaveexperiencedsaysProfessorTonySeatonofLutonUniversity'sInternationalTourismResearchCenter. Poorpublictransport.Trainsandbusesarepromisedtodefeatthekeenesttouristsalthoughtheover﹣crowdedLondontubeisunbelievablepopular. Lackoflanguages.Speakingslowlyandclearlymaynotgetmanyforeignvisitorsveryfareveninthetouristtraps. Rain.Stillinthenumberonecomplaint. Noair﹣conditioning.Sothatevensplendidlyhotsummersbecomeasunbearableasthedown﹣pours. Overpricedhotels.TheonlyEuropeancountrywithahigherrateoftaxonhotelroomsisDenmark. Licensinghours.Alcohol酒isinshortsupplyafter11p.m.evenin24﹣hourcities. 1.Whatdotouristscomplainmost? A.Poorservice. B.Poorpublictransport. C.Rain. D.Overpricedhotels. 2.WhatdowelearnaboutpopmusicinBritainandtheUSthroughthispassage? A.PopmusicinBritainisbetterthanthatintheUS. B.PopmusicinBritainisasgoodasthatintheUS. C.PopmusicinBritainisworsethanthatintheUS. D.PopmusicinBritainisquitedifferentfromthatintheUS. 3.Whenisalcoholnotabletogeteasily? A.At900p.m. B.At1000p.m. C.At1100p.m. D.At1200p.m. 4.Whichofthefollowingistrueaccordingtothepassage? A.Youhavetopaytovisitthemuseums. B.It'sverycheaptotravelbytaxithere. C.YoucannotfindChinesefoodthere. D.Thepublictransportispoorthere.
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IwastenwhenIfirstsatwithmygrandmotherbehindthecashier收银台inhergeneralstore.1Iquicklylearnedtheimportanceoftreatingcustomerspolitelyandsayingthnakyou. AtfirstIwaspaidincandy.2Iworkedeverydayafterschoolandduringthesummerandonweekendsandholidaysfrom8a.m.to7p.m.Myfatherhelpedmesetupabannkaccount.3 BythetimeIwas12MygrandmotherthoughtIhaddonesuchagoodjobthatthepromotedmetosellingcosmetics化妆品.Idevelopedtheabilitytolookcustomersdirectlyintheeye.EventhoughIwasjustakidwomenwouldaskmesuchthingsasWhatcolordoyouthinkIshouldwear?Itookarealinterestintheirquestionsandwasabletotranslatewhattheywantedintomakeup化妆ideas.4 Thejobtaughtmeavaluablelessontobeasuccessfulsalespersonyoudidn'tneedtobeaRocketscientist﹣youneededtobeagreatlistener.5expecttheyareNOlongerwomenpurchasingcosmeticsfrommeinsteadtheyarekidswhotellmewhichtoystheywouldliketoseedesignedanddeveloped. A.LaterIreceived50centsanhour. B.Beforelongsheletmesirtherebymyself. C.Iendedmysellingarecordamountofcosmetics. D.TodayIstillcarrythatlessonwithmeIlistentocustomers. E.Mygrandma'strusttaughtmehowtohandleresponsibility. F.SoonIfoundmyselflookingmorebeautifulthaneverbefore. G.WatchingmymoneygrowwasmorerewardingthananythingIcouldhavebought. 1. 2. 3. 4. 5.
设变量xy满足约束条件则z=x﹣y的取值范围为
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6分NingZetaohasbecomeChina'snewswimmingstarduetohisamazingperformanceatthe2014AsianGamesinIncheon仁川SouthKorea.Withalreadytwogoldmedalsinhandthe21﹣year﹣oldclocked47.70secondsinthe100mfreestylesettinganewAsianrecord.ThisresulthasbeenrecognizedbyFINAastheworld'sthirdbesttimethisyearfastenoughtohavewonagoldmedalinlastyear'sBarcelonaWorldChampionships.ItismyfirstinternationaleventsaidNingwholaterwonafourthgoldmedalinIncheon.Iamhappythatmyresultsareprettyclosetomypersonalbest. BorninthecentralChinesecityofZhengzhouNingenteredthelocalteamattheageof11andjoinedthenavyteamin2007.Hefirstcaughtpeople'sattentionin2009whenhefinishedeighthinthe200mindividualmedley混合泳attheNationalGames. NeverthelessNingsufferedfromboneinfectioninbothkneesforalongtimewhichmadehimunabletotrainhardonhiskicks.Healsohadanindigestionproblemandhadtoeatsoftfoodwhichiseasytodigest.Hispoorstomachevenmadeitimpossibleforhimtocompleteweek﹣longfulltimetraining.Buttheyoungswimmernevergivesup.HisidolisthegreatRussianswimmerAlexanderPopovwhocontinuedtowinOlympicgoldmedalsafterhewasstabbed刺伤onastreet.NingsaidHewasarealfighterandIneedtolearnfromhim. TakenbettercareofbycoachesanddoctorsNingcannowtrainasnormallyasothers.Andthatiswhyhecangettoday'sachievements.ThegoldmedalsattheAsianGamesalsoboostedtheconfidenceofthenewswimmingstarwhohopestoenterthenationalteamandcompeteforChinainmoreinternationalevents.Chinesemaleswimmershaveneverbeenplacedamongtopeightintheshort﹣distancefreestylehesaid.IhopeIcandoitjustlikewhatSunYangdidinthemid﹣longdistancefreestyle. 1.Thebesttitlecouldbe. A.NingZetaoaworldfamousswimmer B.NingZetaoapromisingrisingstar C.NingZetaoastrong﹣willedsoldier D.NingZetaoaworldgoldmedalist 2.Wecanlearnfromthepassagethat. A.theresultsNinggotinIncheonarehisbest B.Ningisgoodatboth100mand200mfreestyle C.NingbrokeanAsianrecordatthe2014AsianGames D.Ninghasalreadygot5goldmedalsintheinternationalevent 3.Itcanbeinferredfromthepassagethat. A.somehealthproblemshavelittleeffectonNing'straining B.beingwellcaredofisthemainreasonforNing'sachievements C.theChineseswimmershavenevergotintothetopeighthintheworldevent D.goldmedalistasNingisheisnotyetamemberofNationalSwimmingTeam
ChooseYourOne﹣DayTours TourA﹣Bath&StonchengeincludingentrancefeestotheancientRomanbathroomsandStonehenge﹣£until26Marchand£39thereafter. Visitthecitywithover2000yearsofhistoryandBathAbbeytheRoyalCrescentandtheCostumeMuseum.Stonehengeisoneoftheworld'smostfamousprehistoricmonumentsdatingbackover5000years. TourB﹣Oxford&StratfordincludingentrancefeestotheUniversityStMary'sChurchTowerandAnneHathaway'shouse一32until12Marchand36thereafter. OxfordIncludesaguidedofEngland'soldestuniversitycityandcolleges.Lookoverthecityofdreamingspires尖顶formStMary'sChurchTower.StratfordIncludesaguidedtourexploringmuchoftheShakespearewonder. TourC﹣WindsorCastle&HamptonCourtincludingentrancefeestoHamptonCourtPalace﹣﹣£34untilMarchand£37thereafter. IncludesaguidedtourofWindsorandHamptonCourtHenryMill'sfavouritepalace.FreetimetovisitWindsorCastleentrancefeesnotincluded.With500yearsofhistoryHamptonCourtwasoncethehomeoffourKingsandoneQueen.Nowthisformerroyalpalaceisopentothepublicasamajortouristattraction.Visitthepalaceanditsvarioushistoricgardenswhichincludethefamousmaze迷宫whereitiseasytogetlost! TourD﹣CambridgeincludingentrancefeestotheTowerofSaintMarytheGreat﹣£33.until18Marchand£37thereafter. IncludesaguidedtourofCambridgethefamousuniversitytownandthegardensofthe18thcentury. 33.WhichtourwillyouchooseifyouwanttoseeEngland'soldestuniversitycity? A.TourAB.TourBC.TourCD.TourD 34.Whichofthefollowingtourschargesthelowestfeeon17March? A.WindsorCastle&HamptonCourt. B.Oxford&Stratford C.Bath&Stonehenge. D.Cambridge. 35.WhyisHamptonCourtamajortouristattraction? A.Itusedtobethehomeofroyalfamilies. B.Itusedtobeawell﹣knownmaze C.ItistheoldestpalaceinBritain D.Itisaworld﹣famouscastle.
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JeanDriscollcangofasterinherwheelchairthantheworld'sbestmarathoners马拉松运动员canrun! InAprilJeanfinishedtheBostonMarathonin1hour34minutes22seconds.That'sabout33minutesfasterthanthewinningmalerunner!Shecompetedonthetracktoo.Shewassecondinthe800meterwheelchairraceatthe1992Olympics. Jeandoesn'tliketobetoldshe'sbrave.I'minsportsbecauseI'macompetitiveperson!Jeanwasbornwithspinabefida脊柱裂abirthillnessthatdamagesthespine脊椎.Shebegantouseawheelchairtogetaroundinhighschool.Thenshetriedwheelchairraceandwasamazed.PlayerscrashedintoeachotherandfelloutoftheirchairsshesaysItwasfun. Jeantriedotherwheelchairsports.AttheUniversityofIllinoisherwheelchairbasketballteamwontwonationaltitles. NowJeancoachesandteaches.Shetriestogetpeopletosetgoals.WhenIsignmyautograph亲笔签名saysJeanIwritedreambigandworkhard. 1.WhatmadeJeantakepartinsports? A.Shewasbrave. B.Shewascompetitive. C.Shewasstrong. D.Shewasdisabled. 2.Whatkindofeducationdidshereceive? A.Highschool. B.Juniormiddleschool. C.Higheducation. D.Primaryschool. 3.WhatisJean'sadviceonhowtosucceed? A.Workhard. B.Hopeforthebest. C.Dreamalot. D.Havegreatwishesandworkhard.
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