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有一组实验数据如表所示: x 2.01 3 4.01 5.1 6.12 y 3 8.01 15 23.8 36.04...
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高二上学期数学《》真题及答案
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一组数据34x143有唯一的众数3则这组数据的中位数是
3
3.5
4
4.5
若一组数据2468x的方差比另一组数据5791113的方差大则x的值可以为www-2-1-cnjy-
12
10
2
0
有一组数据634x7它们的平均数是10则这组数据的中位数是_________.
为了探究实心圆柱体对水平地面压力的作用效果与哪些因素有关某同学用若干个不同的圆柱体竖直放在同一水平沙
已知一组数据1xy495有唯一众数4且平均数是5则这组数据的中位数是
下列关于众数的叙述正确的有
一组数据可能存在多个众数
众数主要适用于分类数据
一组数据的众数是唯一的
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一组数据的众数不一定是唯一的
下列说法中正确的个数有①一组数据的平均数一定是该组数据中的某个数据②一组数据的中位数一定是该组数据中
)0个; (
)1个; (
)2个; (
)3个.
按右图所示的流程输入一个数据x根据y与x的关系式就输出一个数据y这样可以将一组数据变换成另一组新的数
下面说法①如果一组数据的众数是5那么这组数据中出现次数最多的数是5②如果一组数据的平均数是0那么这组
1
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4
已知一组数据123x5它们的平均数是3则这一组数据的方差为
1
2
3
4
已知一组数据x1x2xn的方差为s2那么另一组新数据x1+ax2+axn+aa≠0的方差是
有一组实验数据如下表所示下列所给函数模型较适合的是
y=log
a
x(a>1)
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2
+b(a>0)
y=log
a
x+b(a>1)
一组数据x1x2x3xn的极差是8另一组数据2x1+12x2+12x3+12xn+1的极差是
8
9
16
17
如果一组数据x1x2xn的方差是3则另一组数据x1+5x2+5xn+5的方差是.
3
8
9
14
有一组实验测量数据667和8四个数则中位数为
6
6.5
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6.0
一组数据25162x3中唯一的众数是x这组数据的中位数是________
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一组数据的众数是唯一的
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一组数据的众数不一定是唯一的
若一组数据34x58的平均数是4则该组数据的中位数是
已知一组数据20x-31这组数据极差是6则x=.
下表是小明同学利用下图所示的实验装置探究液体压强规律时所测得的部分数据. 实验所
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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. Lifeisfullofvariousexperiencessomeofthemareunforgettable.Istillrememberthehikingexperienceswithmyclassmatesfor16kmayearlater.Thatsummerdaywesetoffearlyinthemorningthinkitwouldbegreatfuntowalkforsolongadistance.HoweverwiththeweatherisgettinghotterandhotterIfoundtheirlegsheavierandheavier.What'sworsemyfeetbeganbleedingbecauselongtimepressingagainsttheshoes.AtonepointIevenwantedtogiveup.ButImanagetodragtherestofthewaytothedestination. Thoughnotpleasantthisjourneywasimpressiveorrewarding.Ihavelearntthatlifeisalongjourneylikethis.Nomatterwhathappenedweshouldnevergiveup.
IntheUnitedStateswhenonebecomesrichhewantspeopletoknowit.Andevenifhedoesnotbecomeveryrichhewantspeopletothinkthatheis.ThatiswhatkeepingupwiththeJonesesisabout.Itisthestoryofsomeonewhotriedtolookasrichashisneighbors. Theexpressionwasfirstusedin1913byayoungAmericancalledArthurMomand.Hetoldthisstoryabouthimself.Hebeganearning$125aweekattheageof23.Thatwasalotofmoneyinthosedays.HegotmarriedandmovedwithhiswifetoaverywealthyneighborhoodoutsideNewYorkCity.WhenhesawthatrichpeoplerodehorsesMomandwenthorsebackridingeveryday.WhenhesawthatrichpeoplehadservantsMomandandhiswifealsohiredaservantandgavebigpartiesfortheirnewneighbors. Itwaslikearacebutonecouldneverfinishhisracebecauseonewasalwaystryingtokeepup.TheraceendedforMomandandhiswifewhentheycouldnolongerpayfortheirnewwayoflife.TheymovedbacktoanapartmentinNewYorkCity. Momandlookedaroundhimandnoticedthatmanypeopledothingsjusttokeepupwithrichlifestyleoftheirneighbors.Hesawthefunnysideofitandstartedtowriteaseriesofshortstories.HecalleditKeepingupwiththeJonesesbecauseJonesisaverycommonnameintheUnitedStates.KeepingupwiththeJonesescametomeankeepingupwithrichlifestyleofthepeoplearoundyou.Momand'sseriesappearedindifferentnewspapersacrossthecountryforover28years. PeopleneverseemtogettiredofkeepingupwiththeJoneses.AndthereareJonesesineverycityoftheworld.ButonemustgettiredoftryingtokeepupwiththeJonesesbecausenomatterwhatonedoesMr.Jonesalwaysseemstobeahead. 1SomepeoplewanttokeepupwiththeJonesesbecausethey. A.wanttobeasrichastheirneighbors B.wantotherstoknowortothinkthattheyarerich C.don'twantotherstoknowtheyarerich D.wanttobehappy 2Itcanbeinferred推断fromthestorythatrichpeopleliketo. A.liveoutsideNewYorkCity B.liveinNewYorkcity C.liveinapartments D.havemanyneighbors 3ArthurMomandusedthenameJonesinhisseriesofshortstoriesbecauseJonesis. A.animportantname B.apopularnameintheUnitedStates C.hisneighbor'sname D.notagoodname 4AccordingtothewriteritistokeepupwiththeJoneses. A.correct B.interesting C.impossible D.good
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Whattoexpectathighschool Areyousuperworriedaboutwhattoexpectathighschool?Wellguesswhat?Everyoneis!Thefollowingtipswillhelpguideyousafelythroughyourfirstday! ►Understandthatyou'llbemovingalot. Dependingontheschoolyou'reattherecouldbemoresubjectsandyou'llhavemoreclassrooms!1Bereadytomovearoundandrememberwhatclassroomstheyarein. ►Understandthenewnessofhighschool. Thereareusuallymorestrictteachersandmoreclassrooms!Don'tworry.2Morefriendsandmorefreedomhopefully!Therewillbealotofdifferencessogoalongwithitanddon'tfeelnervousaboutthechange. ►3 Stayawayfromstudentswhohavehighergradesthanyou!They'reolderandyouwillbeaneasytarget目标sowatchyourback!Iftheydotrytothreaten恐吓youoranythingtellyourparentsorteacherstohelpyouwithit. ►Bepreparedforthediningroom. Makesureyouhavefriendstositwithoryou'lllooklonelyandfeellonely.Makesomenewfriendstositwith.4 ►Remembertostaygoodinschool. 5Youdon'tneedanAforeverythingbutanFoneverythingisnotgood!Spendenoughtimeonstudyandtakenotesduringclass. A.Knowwhotowatchoutfor. B.Putyourbooksinorder. C.Oneforeverysubject. D.Therearesomeadvantages! E.Doyourhomeworkandmakesureyoustudyhard! F.Trytomakeagoodimpressionontheteachers. G.Trytoeathealthilyonyourfirstday.
InthebookTheBestLittleGirlintheWorldKessahasaseriouseatingdisorder进食障碍calledanorexianervosa神经性厌食症.Butsheisnotalone.Manypeoplehavethiseatingdisorder. InthebeginningofherstoryKessaisanormal15﹣year﹣oldgirl.Sheisgoodatmanythingsespeciallydancing.Shehasdancedformanyyearsandlovesit.Onedayherdanceteachertellshertocontinueeatingrightbutmaybeloseafewpounds.OnceKessahearsthisshetakesthingstoofar.Insteadofcuttingdownonsnacksandjunkfoodshedecidesnottoeatatall.Shedoesnoteatbreakfastlunchordinner.Shebeginslosingweightandbecomesslimmer更加苗条的andslimmer.Butshelosesweighttoapointwheresheisunhealthy. Asherpooreatinghabitscontinueherparentsstartgettingasmuchhelpaspossibletocuretheirbeautifuldaughter.ButitisjustashardforKessa'sparentstodealwithherdisorderasitisforher.Everydaysheexercisestolosemorepoundsandplanswhatandwhenshewilleat.HerparentstryeverythingbutKessadecidesnottohaveanyfatonherbody. Kessa'sdoctorandparentsfinallytakehertothehospital.Sheisnowsothinthatshecanhardlywalk.Theresheisgivengoodcare. IntherestofthebookKessagoesthroughalotoftroubleinordertocurehereatingdisorder.ThisbookIthinkcanhelptopreventpeoplefromdoingthistothemselves.Itshowsthetroublethatpeoplegothroughjusttobeslimmerandalltheterriblethingstheymustexperiencetobecured.ItisabookIthinkeveryteenagershouldread. 9.WhatdoesKessadotoloseweight? A.Shedancesmanymorehoursaday. B.Sheeatslessjunkfood. C.Shehasthreesmallmealsaday. D.Shestopseating. 10.WhatdoweknowaboutKessa'seatingdisorder? A.Itmakeshersufferalot. B.It'stooserioustobecured. C.Itiscausedbyherdanceteacher. D.It'sanunusualillness. 11.Thebookmentionedinthetextismainlyabout. A.howtocureeatingdisorders B.theimportanceofeatingright C.agirl'sfightagainstaneatingproblem D.whysomanypeoplehaveeatingdisorders.
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Badnewssells.Ifitbleedsitleads.Nonewsisgoodnewsandgoodnewsisnonews.Thosearetheclassicrulesfortheeveningbroadcastsandthemorningpapers.Butnowthatinformationisbeingspreadandmonitored监控indifferentwaysresearchersarediscoveringnewrules.Bytrackingpeople'se﹣mailsandonlinepostsscientistshavefoundthatgoodnewscanspreadfasterandfartherthandisastersandsobstories. The‘ifitbleeds'ruleworksformassmediasaysJonahBergerascholarattheUniversityofPennsylvania.Theywantyoureyeballsanddon'tcarehowyou'refeeling.Butwhenyoushareastorywithyourfriendsyoucarealotmorehowtheyreact.Youdon'twantthemtothinkofyouasaDebbieDowner. Researchersanalyzingword﹣of﹣mouthcommunication﹣e﹣mailsWebpostsandreviewsface﹣to﹣faceconversations﹣foundthatittendedtobemorepositivethannegative消极的butthatdidn'tnecessarilymeanpeoplepreferredpositivenews.Waspositivenewssharedmoreoftensimplybecausepeopleexperiencedmoregoodthingsthanbadthings?TotestforthatpossibilityDr.Bergerlookedathowpeoplespreadaparticularsetofnewsstories:thousandsofarticlesonTheNewYorkTimes'website.HeandaPenncolleagueanalyzedthemoste﹣mailedlistforsixmonths.Oneofhisfirstfindingswasthatarticlesinthesciencesectionweremuchmorelikelytomakethelistthannon﹣sciencearticles.HefoundthatscienceamazedTimes'readersandmadethemwanttosharethispositivefeelingwithothers. Readersalsotendedtosharearticlesthatwereexcitingorfunnyorthatinspirednegativefeelingslikeangeroranxietybutnotarticlesthatleftthemmerelysad.Theyneededtobearoused激发onewayortheotherandtheypreferredgoodnewstobad.ThemorepositiveanarticlethemorelikelyitwastobesharedasDr.BergerexplainsinhisnewbookContagious:WhyThingsCatchOn. 8.Whatdotheclassicrulesmentionedinthetextapplyto? A.Newsreports. B.Researchpapers. C.Privatee﹣mails. D.Dailyconversations. 9.WhatcanweinferaboutpeoplelikeDebbieDowner? A.They'resociallyinactive. B.They'regoodattellingstories. C.They'reinconsiderateofothers. D.They'recarefulwiththeirwords. 10.Whichtendedtobethemoste﹣mailedaccordingtoDr.Berger'sresearch? A.Sportsnews. B.Sciencearticles. C.Personalaccounts. D.Financialreviews. 11.Whatcanbeasuitabletitleforthetext? A.SadStoriesTravelFarandWide B.OnlineNewsAttractsMorePeople C.ReadingHabitsChangewiththeTimes D.GoodNewsBeatsBadonSocialNetworks.
Annewasalittlegirl41livedinthecapitalofNetherlandsduringWorldWarⅡ.HerfamilywasJewishsotheyhadtohideinordernottobe42catchbytheGermanNazis.Theyhidawayforabouttwoyears43theywerediscovered.DuringthattimeAnneformedthehabitof44keepadiarywhichshemadeherbestfriend.Shesetdownhowshe45feelinherdiary. NothavingbeenabletobeoutdoorsforlongAnnegrewcrazy46everythingtodowithnature.Oneeveningforexampleshestayedawakeonpurposeuntillateintothenightsoastohaveagoodlookatthemoon.Anothertimeshehappenedtobeupstairsatduskwhenthewindowwasopen.Shedidn'tgodownstairs47thewindowhadtobeshut.Itwasthefirsttimeinayearandahalfthatshe48seethenightfacetoface.49sadshewasonlyabletolookatnaturethroughdirtycurtainshangingbeforevery50dustwindows.
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OnmyfirstdayofhighschoolIaskedaneleventh﹣graderwheremyclasswas.Andhetoldmeitwasonthefourthfloornexttothepool.Ifoundoutfiveminuteslaterthatwedon'tevenhaveafourthfloorandthere'snopooleither!BesidesthatIdidn'thaveanytroublewiththeolderkid. Ithinkthebiggestdifferencebetweenmiddleandhighschoolisthehomeworkload工作量andsizeoftheschool.IwentfrommaybefifteenminutesofhomeworkanighttoseveralhourssoIhadtolearnhowtomakefulluseoftime!Ourclasssizeisaround550butjoininginclubssportsmusicandotheractivitiesatschoolmakesiteasiertogettoknowpeopleineverygrade. ThebestadviceIcangiveabouttheyearsyouspendinhighschoolistolearnthingsforyourselfnotjusttogetagoodgrade.TherehavebeensomanyteststhatI'vepreparedforthenightbeforegottenanAandnotrememberedanythinglater.I'vechangedthatthisyearandIenjoyschoolsomuchmore.Don'ttakeeasyclassesjusttohaveasimpleyear.Ifyouhaveachoicebetweenchemistryandsportsthefirstwillprovetobealotmoreuseful! Whiledrinkingandsmokingmightbepresentinsomemiddleschoolsthey'realsoaroundinhighschool.Ihavealotoffriendswhopromisedthey'dneverdrinkorsmokebutarenowpartyingeveryweekend.Ifyouhavefunandspendyournightswastedinsteadofstudyingyouwillregretitwhenyou'reapplyingfor申请college.Thefriendswhosayyou'realoserfornotpartyingarereallynotyourfriendsatall.It'shardtoseeyourclosestfriendsgrowapartandgoindifferentdirectionsbutdon'tfollowtheirfootsteps.Createyourownpathinlifeandmakeyourowndecisions. 1.Whathappenedtotheauthoronhisfirstdayofhighschool? A.Hehadafightwithaneleventh﹣grader. B.Hewasfooledbyaschoolboy. C.Hewasfiveminuteslateforclass. D.Hefellintoapoolonthefourthfloor. 2.Theauthoradviseshighschoolstudentsto. A.chooseusefulclasses B.giveupsports C.trytheirbesttogetgoodgrades D.getreadyforteststhenightbefore 3.Thelastparagraphmainlytellsus. A.aboutthetroublecausedbydrinkingandsmoking B.abouttheimportanceofmakingfriends C.nottoloseourselvesinhighschool D.nottogotoanypartyinhighschool.
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如图长方体ABCD﹣A1B1C1D1的棱AB=3AD=AA1=2E点在棱D1C1上且D1E=D1C1则直线AE与DB1所成角的余弦值为.
MonthlyTalksatLondonCanalMuseum Ourmonthlytalksstartat19:30onthefirstThursdayofeachmonthexceptAugust.Admissionisatnormalchargesandyoudon'tneedtobook.Theyendaround21:00. November7th TheCanalPioneersbyChrisLewis.JamesBrindleyisrecognizedasoneoftheleadingearlycanalengineers.Hewasalsoamajorplayerintrainingothersintheartofcanalplanningandbuilding.ChrisLewiswillexplainhowBrindleymadesuchapositivecontributiontotheeducationofthatgroupofearlycivilengineers. December5th IcefortheMetropolisbyMalcolmTucker.WellbeforethearrivaloffreezerstherewasademandforiceforfoodpreservationandcateringMalcolmwillexplainthehistoryofimportingnaturaliceandthetechnologyofbuildingicewellsandhowLondon'sicetradegrew. February6th AnUpdateontheCotswoldCanalsbyLizPayne.TheStroudwaterCanalismovingtowardsreopening.TheThamesandSevernCanalwilltakealittlelonger.Wewillhaveareportonthepresentstateofplay. March6th EyotsandAits﹣ThamesIslandsbyMirandaVickers.TheThameshadmanyislands.Mirandahasundertakenareviewofallofthem.Shewilltellusaboutthoseofgreatestinterest. Onlinebookings:www.canalmuseum.org.uk/book Moreinfo:www.canalmuseum.org.uk/whatson LondonCanalMuseum 12﹣13NewWharfRoadLondonNI9RT www.canalmuseum.org.ukwww.canalmuseum.mobi Tel:02077130836 1WhenisthetalkonJamesBrindley? A.November7th. B.March6th. C.February6th. D.December5th. 2WhatisthetopicofthetalkinFebruary? A.TheCanalPioneers. B.IcefortheMetropolis. C.EyotsandAits﹣ThamesIslands. D.AnUpdateontheCotswoldCanals. 3WhowillgivethetalkontheislandsintheThames? A.ChrisLewis. B.MalcolmTucker. C.MirandaVickers. D.LizPayne.
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设原命题“若a+b≤1则ab中至少有一个不大于”则 ①逆命题是“若ab中至少有一个不大于则a+b≤1” ②否命题是“若a+b≤1则ab中至少有一个大于” ③逆否命题是“若ab中至少有一个不大于则a+b>1” 则叙述正确的命题序号为.
AtthirteenIwasdiagnosedwithkindofattentiondisorder.Itmadeschooldifficultforme.WhenpeopleelseintheclasswasfocusingontasksIcouldnot. InmyfirstliteratureclassMrs.Smithaskedustoreadastoryandthenwriteonitallwithin45minutes.IraisedmyhardrightawayandsaidMrs.SmithyouseethedoctorsaidIhaveattentionproblems.Imightnotbeabletodoit. Sheglanceddownatmethroughherglassesyouarenodifferentfromyourclassmatesyoungman. ItriedbutIdidn'tfinishthereadingwhenthebellrang.Ihadtotakeithome. Inthequietnessofmybedroomthestorysuddenlyallbecamecleartome.ItwasaboutablindpersonLouisBraille.Helivedinatimewhentheblindcouldn'tgetmucheducation.ButLouisdidn'tgiveup.Insteadheinventedareadingsystemofraiseddots点whichopenedupawholenewworldofknowledgetotheblind. Wasn'tItheblindinmyclassbeingmadetolearnlikethesightedstudents?Mythoughtsspilledoutandmypenstartedtodance.Icompletedthetaskwithin40minutes.IndeedIwasnodifferentfromothers;Ijustneededaquieterplace.IfLouiscouldfindhiswayoutofhisproblemswhyshouldIevergiveup? Ididn'texpectanythingwhenIhandledinmypapertoMrs.Smithsoitwasquiteasurprisewhenitcamebacktomethenextday﹣withanAonit.Atthebottomofthepaperwerethesewords:Seewhatyoucandowhenyoukeeptrying? 1Theauthordidn'tfinishthereadinginclassbecause. A.Hewasnewtotheclass B.Hewastriedofliterature C.Hehadanattentiondisorder D.Hewantedtotakethetaskhome 2WhatdoweknowaboutLouisBraillefromthepassage? A.Hehadgoodsight. B.Hemadeagreatinvention. C.Hegaveupreading. D.Helearnedalotfromschool. 3WhatwasMrs.Smith'sattitudetotheauthorattheendofthestory? A.Angry. B.Impatient. C.Sympathetic. D.Encouraging. 4Whatisthemainideaofthepassage? A.Thedisabledshouldbetreatedwithrespect. B.Ateachercanopenupanewworldtostudents. C.Onecanfindhiswayoutofdifficultieswithefforts. D.Everyoneneedsahandwhenfacedwithchallenges.
等差数列{an}满足a1=32a3=a6. 1求数列{an}的通项公式 2设bn=an•3n﹣1”求数列{bn}的前n项和Sn.
Manytimeswedosomethingpositiveorsaysomethingkindbutwedon'tseetheinfluenceithasonotherpeople.Wemay41theserandom随意的actsofkindnessbutweneverknowwhathappensnext.OnetimeIwasluckyenoughto42. Iwasreturningfromatrip43Istoppedtorefuelandgetsnackatagasstation.Itwaslate.Iwas44andhomewasstillmorethantwohoursaway.Iwasfeeling45andmybackhurtfromallthe46. Iwent47.Thecheckersmiledatmeandwe48foramoment.Idon'tremember49whatshesaidbutIdorememberthe50sheshowedme.Iwas51byherkindness.Itkeptmegoingonmyjourneyhome. ThenextweekIwascleaningmypurseandI52thereceipt.Thereceipt收据remindedmeoftheclerk's53andithadtheaddressofthestore.Idecidedto54athank﹣younotetohermanager.IntheletterItoldthemanagerthathisemployee'skindwordsandcaringattitudestoodouttome55mytriphome. Aweek56thatclerkwrotemeback.Asaresultofmynoteshegotan57fromhermanagerandacompanyaward.Iwas58.Robin'skindnessinspiredmetoreturnherpositivity. MotherTeresa59ustodosmallthingswithgreatlove.Oftentimeswhenwedosuchsmallthingswedon'tgettoseetheeffectsofourkindwordsordeeds60everysooftenwe'reblessedtodiscoverthepositiveoutcome. 41.A.imagine B.practice C.devote D.dream 42.A.workout B.figureout C.makeout D.findout 43.A.when B.why C.whether D.that 44.A.clever B.tired C.lazy D.poor 45.A.down B.well C.upset D.disappointed 46.A.driving B.running C.swimming D.walking 47.A.outside B.away C.off D.inside 48.A.believed B.explained C.shouted D.chatted 49.A.exactly B.surprisingly C.carelessly D.unluckily 50.A.interest B.kindness C.shame D.pity 51.A.hungry B.refreshed C.crazy D.angry 52.A.cameacross B.droppedoff C.calledon D.lookedfor 53.A.feelings B.warmth C.strength D.interests 54.A.check B.book C.write D.copy 55.A.designing B.repairing C.taking D.brightening 56.A.ago B.later C.since D.lately 57.A.operation B.suggestion C.employment D.praise 58.A.successful B.shocked C.happy D.thankful 59.A.advised B.forced C.suggested D.demanded 60.A.as B.though C.so D.but
已知椭圆C+=1a>0b>0的左右焦点分别是F1F2C过点M1﹣离心率e=. 1求椭圆C的方程 2若PQ为椭圆C过F1的弦R为PF2的中点O为坐标原点求△RF1F2△OF1Q面积之和的最大值.
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