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已知数列{an}的前n项和为Sn,a1=,an+1=. (1)证明:数列{}为等比数列; (2)证明:Sn<.
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高一下学期数学《》真题及答案
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1Youprobablythinkyouwillneverbeatopstudent.Thisisnotnecessarilysohowever.Anyonecanbecomeabetterstudentifheorshewantsto.Here'show Planyourtimecarefully.Whenplanningyourworkyoushouldmakealistofthingsthatyouhavetodo.Aftermakingthislistyoushouldmakeascheduleofyourtime.Firstyourtimeforeatingsleepingdressingetc.Thendecideagoodregulartimeforstudying.2Aweeklyschedulemaynotsolveallyourproblemsbutitwillforceyourealizewhatishappeningtoyourtime. Findagoodplacetostudy.Lookaroundthehouseforagoodstudyarea.Keepthisspacewhichmaybeadeskorsimplyacornerofyourroomfreeofeverythingbutstudymaterials.Nogamesradiosortelevision.Whenyousitdowntostudyconcentrateonthesubject. Makegooduseofyourtimeinclass.3Listeningcarefullyinclassmeanslessworklater.Takingnoteswillhelpyourememberwhattheteachersays. Studyregularly.Whenyougethomefromschoolgooveryournotesreviewtheimportantpointsthatyourteacherisgoingtodiscussthenextdayreadthatmaterial.4Ifyoudothesethingsregularlythematerialwillbecomemoremeaningfulandyou'llrememberitlonger. Developagoodattitudetowardstests.Thepurposeofatestistoshowwhatyouhavelearnedaboutasubject.Theyhelpyourememberyournewknowledge.Theworldwon'tendifyoudon'tpassatestsodon'tbeoverworried. 5Youwillprobablydiscoverthemafteryouhavetriedthese. A.Thereareothermethodsthatmighthelpyouwithyourstudying. B.Don'tforgettosetasideenoughtimeforentertainment. C.Takeadvantageofclasstimetolistentoeverythingtheteachersays. D.Noonecanbecomeatopstudentunlessheorsheworkshard. E.Maybeyouareanaveragestudent. F.Makefulluseofclasstimetotakenotesofwhattheteachersaysinclass. G.Thiswillhelpyouunderstandthenextclass.
Eatricebrew酒酿inclass?Youmustbejoking.Butthat'swhathappenedinHefeiHupoMiddleSchoolinAnhui.Junior2studentstheremadetheirownricebrewtolearnaboutfermentation发酵. Thestudentshavealreadylearnedthelessoninclass.Buttheywon'treallyunderstandituntiltheymaketheirownbrewsaidLiangWentheirbiologyteacher. Studentsmadethebrewingroups.Theyfirstboughtyeast酵母andcookedtherice.Thentheymixedthericeandyeastcarefullytogetherinabigcleanbowl.Themostimportantthingistoputthebowlinawarmplace.Yeastworksbestthere.That'sthesecretofagoodricebrew!Afteraboutaweekthericebecomesricebrew. Ourbrewlookssodelicious.Icouldn'twaittotasteit!saidXiYiwena14﹣year﹣oldgirl.ButXihadtowaitbecausetheyhadtoeatitatthetastingparty.Duringthepartytheteacherheatedupeachgroup'sricebrewforeveryonetotaste.Thestudentsthenchoseonegroupasthebestbrewmaker. Somegroup'sbrewwaspopularandsooneatenupbutsomewassourandtastedterrible!Somestudentsevenboughtnewbrewbecausetheyfailedtomaketheirown. Workingtogetherbroughtushappinessnomatterwhattheresultwas!saidWangYajuna=15﹣year﹣oldgirl.Hergroupwasthebestintheclass. 1Putthefollowingstepsinthecorrectorder a.thericebecomesricebrew b.buyyeast c.putthebowlinawarmplace d.cooktherice e.mixtheyeastandricecarefullyinacleanhowl A.a﹣b﹣c﹣d﹣e B.b﹣a﹣c﹣d﹣e C.b﹣d﹣e﹣c﹣a D.b﹣d﹣a﹣e﹣c 2Theteacheraskedthestudentstomakebrewbythemselvesbecause. A.theteacherlikedtoeatricebrew B.theteacherwantedthestudentstofindoutaboutfermentationthemselves C.theteacherwantedtomakethestudentsworkharder D.theteacherwantedtofindoutwhomakesthebestbrew 3Somestudentshadsourbrewprobablybecause. A.theydidn'tgetthebestyeast B.theywantedtobuybrewfromsupermarkets C.theydidn'tputthebowlintherightplace D.theydidn'tcookenoughrice 4Thebesttitleforthispassageis. A.Afunlessonaboutfermentation B.Howtomakericebrew C.Thehappinessofworkingtogether D.Scienceoffermentation
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某公司有如图所示的甲乙丙丁四个生产基地.现决定在其中一个基地修建总仓库以方便公司对各基地生产的产品进行集中存储.已知甲乙丙丁各基地的产量之比等于4542各基地之间的距离之比abcde=23433因条件限制只有图示中的五条运输渠道当产品的运输数量和运输路程均相等时所需的运费相等.若要使总运费最低则修建总仓库的最佳位置为
Ihavealwaysthoughtofmyselfasadoer.InworkIcertainlywasandcontinuetobe.AsamomI'mmostlyadoer.Howevermy1forbreastcancermademe2Ihadn'tbeenadoerinthewayIwantedtobe﹣butthatwasaboutto3. SinceIbecamea4andreportedmanyplanecrashesI'vebeen5offlying.Myfamilyhad6beentoanothercontinenttogether.Nowthatthechemo化疗7asagifttomyselfmykidsandmymomItookthemalltoLondonto8lifebeforebeginningradiationeveryweekdayforsixweeks. ThistimeImadea9nottothinktoomuchaboutit.Lookinginthemirrorwithouthairyoudoyourbestto10yourdayasthoughitwereaday11youdiscoveredyourlump肿瘤.Theneverythingseemsdoable.12Ijustbookedthetrip.InLondoneverydayI13adifferentadventurefromwhichmyfamilyandIlearnedmuchand14ourselves. Ihadwantedtotakea15likethisforyearsbutlifeandworkhadgottenintheway.Now16lifeandworkwehadfinallydone17.Ihavethoroughlyenjoyedfamilylearning18livingbutnothingisbetterthanknowingthatmykidsfeel19forthetrip.Onedayperhapsthey'llrealizethatsometimesthebest20comesaftersurvivingyourgreatestfears. 1A.treatment B.reason C.concern D.anxiety 2A.ignore B.imagine C.realize D.doubt 3A.happen B.continue C.change D.arise 4A.pilot B.doctor C.tourist D.journalist 5A.tired B.fond C.afraid D.proud 6A.frequently B.already C.never D.just 7A.failed B.ended C.delayed D.approached 8A.save B.create C.celebrate D.improve 9A.wish B.decision C.judgment D.conclusion 10A.lookfor B.getridof C.lookbackon D.getthrough 11A.after B.before C.until D.when 12A.But B.So C.Otherwise D.Even 13A.expected B.planned C.experienced D.described 14A.enjoyed B.taught C.introduced D.trained 15A.rest B.lesson C.risk D.trip 16A.intermsof B.owingto C.regardlessof D.inadditionto 17A.them B.it C.everything D.something 18A.for B.by C.with D.beyond 19A.grateful B.eager C.ready D.sorry 20A.work B.chances C.love D.adventures
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分解因式x2+2x+1=.
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SowhyhasEnglishchangedovertime?1actualalllanguageschangeanddevelop2culturesmeetandcommunicatewitheachother.AtfirsttheEnglishspokeninEnglandbetweenaboutAD450and1150wasverydifferentfromtheEnglish3speaktoday.ItwasbasedmoreonGerman4theEnglishwespeakatpresent.ThengraduallybetweenaboutAD800and1150Englishbecame5littlelikeGermanbecausethosewho6ruleEnglandspokefirstDanishandlaterFrench.ThesenewsettlersenrichedtheEnglishlanguageandespecially7itvocabulary.Sobythe1600'sShakespearewasabletomakeuseof8widervocabularythaneverbefore.In1620someBritishsettlersmovedtoAmerica.Laterinthe18thcenturysomeBritishpeople9taketoAustraliatoo.Englishbegantobespokeninboth10country.
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ScottandDanielHarryareenjoyingeverydaytaskslikeshoppingandwashingforthefirsttimefollowingtheirmovetoanaccommodation住宿supporthouseinKurwongbahnorthofBrisbanelastyear. DisabilityServicesQueensland'sStrengtheningNon﹣GovernmentOrganisationsprojectprovidedanaccommodationsupportmodelthatwouldenableresidents居住者likeDanielandScotttolivemoreindependently. Thehouseisjustoneofmanyaccommodationsupportservicesfunded资助throughtheproject.Thefive﹣bedroomhouseprovides24﹣hourcareforuptofourindividualswithcomplexneedsincludingmedicalsupport.Careandstaffinglevelsarevariedandflexibledependingoneachresident'srequirements. ScottandDanielwhohaveasevereformofDuchenneMuscularDystrophyrequire24﹣hoursupportinallactivitiesofdailyliving.Beforetheymovedtothehousetheylivedwiththeirfamily.Scottsayslivingathomewasdifficultasitplacedaphysicalandemotionalstrain负担ontheirparentswhohadtowakethemseveraltimeseachnighttorepositionthemorplacethemonbreathingmachines. WewereheavyheartedsaysScottwhoisplanningtowriteabookabouthislifeexperiences.Butourparentsnowhavealotmoretimeforthemselves.Wenowmanageourselvesonaday﹣to﹣daybasis. Danielisanenthusiasticgardenertakingcareofhisownvegetablegarden.Themensharethehousewithoneotheryoungmanandtheygotorugbyleaguegamesmeetingupwithfriends. LeedingCareAustraliaprovidesthecareserviceatKurwongbah.ManagerLeeGarnisssayssettingupthefacilities设施hasnotbeenwithoutitschallenges. ItisanunconventionalmodelofcareLeesays.ThehomeisScottandDaniel'shomehoweveritisalsoaworkplacefortheirsupportstaff.Balancingthesetworequirementshasbeenachallengeforall. Wehaveexperiencedabitofalearningphaseoverthelasttwelvemonths.HoweverbyworkingasateamwetryourbesttomeettheneedsofbothresidentsandstaffandIthinkwehaveachievedtherightbalance. 1WhatdoweknowaboutthehouseScottandDanielliveinnow? A.Itwasbuiltbytheirparents. B.Itcanaccommodatefourresidents. C.Itbelongstoagovernmentalproject. D.It'slocatedinthecenterofBrisbane. 2WhydidScottandDaniel'sparentswakeupfrequentlyatnight? A.Tohelpthemdoexercise. B.Theyweremakingalotofnoise. C.Tocheckontheirbreathing. D.Theywereunderemotionalpressure. 3HowdidScottfeelwhilelivingwithhisparents? A.Abitguilty. B.Quitehappy. C.Veryproud. D.Slightlyangry. 4Whatwasachallengewhilesettingupthefacilities? A.Lackoffund. B.Noworkplace. C.Inexperiencedstaffmembers. D.Satisfyingbothstaffandresidents'needs.
如图已知⊙O是△ABC的外接圆且BC为⊙O的直径在劣弧上取一点D使=将△ADC沿AD对折得到△ADE连接CE. 1求证CE是⊙O的切线 2若CE=CD劣弧的弧长为π求⊙O的半径.
假如你是李华你的好朋友苏茹在交友方面存在一些困难请根据下面的提示给她写一封信. 内容要点如下 1.要交朋友首先要做一个朋友 2.要和朋友同甘共苦患难之中的朋友才是真正的朋友 3.友谊需要时间和投入effort. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯. 3.信的开头与结尾已为你拟好不计入总词数. DearSuRu Iamsorrytoknowthatyouarehavingtroubleinmakingfriends. Yours LiHua
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﹣2的绝对值为
Chinahasannouncedit'sabolishingitsone﹣childpolicy.Whatdifferencehasitmadestatisticallyspeaking? 400millionbirthsprevented Theone﹣childpolicyofficiallyinplacesince1979hasprevented400millionbirths.Parentshavefacedfinesandotherpunishmentsforhavingmorechildren. ThemajorityofthedecreaseinChina'sfertilityratehappenedinthe1970s.Itdroppedfrom5.8childrenperwomanin1970to2.7in1978.Despitetheone﹣childpolicytheratehadonlyfallento1.7by2013. 2128﹣babydeathsrate Sincetheone﹣childpolicywasintroducedbabygirlshavebecomemorelikelytodiethanboys. Inthe1970saccordingtotheUnitedNations60malesper1000livebirthsdiedundertheageofone.Forgirlsthefigurewas53.Inthe1980saftertheone﹣childpolicybecameofficialtherateforbothwas36.Bythe1990s26malesper1000livebirthsdiedbeforetheageofone﹣and33girls.The2000ssaw21boysper1000livebirthsdyingand28girls. 1.16boysbornforeverygirl SexuallyselectiveabortionshavebeenconsideredasamajorcauseofChina'sunusualimbalance. Gietel﹣BastenassociateprofessorinsocialpolicyatOxfordUniversitysaysthebirthsofmanygirlsarenotregisteredifparentshavebrokentherulebyhavingtwochildrenaddingofficialsoftenturnablindeye.It'sestimatedtherearenow33millionmorementhanwomeninChina. 421families WiththeageingofChina'spopulationandthecontinuationoftheone﹣childpolicya421homeisthedescriptiongiventohouseholdsinwhichtherearefourgrandparentcaredforbytwoworkingageparentswhothemselveshaveonechild. By2050it'spredictedthataquarterofChina'spopulationwillbe65orolder.Thepredicteddeclineinthenumberofpeopleofworkingageisthoughttohavepersuadedthegovernmenttodroptheone﹣childpolicy. 1Whenwasthebabydeathsrateforbothboysandgirlsequal? A.Inthe1970s. B.Inthe1980s. C.Inthe1990s. D.Inthe2000s 2Whatmakestheone﹣childpolicyabolishedaccordingtothepassage? A.Thedeclineofbirthrate. B.Theriseofbabydeathsrate. C.Thechangeoffamilystructure. D.Thedeclineofworkingagepeople. 3Thepassagesumsuptheonechildpolicyby. A.number B.example C.contrast D.analysis
YouprobablyknowwhoMarieCuriewasbutyoumaynothaveheardofRachelCarson.Oftheoutstandingladieslistedbelowwhodoyouthinkwasthemostimportantwomanofthepast100years? JaneAddams1860﹣1935 AnyonewhohaseverbeenhelpedbyasocialworkerhasJaneAddamstothank.Addamshelpedthepoorandworkedforpeace.Sheencouragedasenseofcommunity社区bycreatingsheltersandpromotingeducationandservicesforpeopleinneedIn1931AddamsbecamethefirstAmericanwomantowintheNobelPeacePrize. RachelCarson1907﹣1964 Ifitweren'tforRachelCarsontheenvironmentalmovementmightnotexisttoday.Herpopular1962bookSilentSpringraisedawarenessofthedangersofpollutionandtheharmfuleffectsofchemicalsonhumansandontheworld'slakesandoceans. SandraDayO'Connor1930﹣present WhenSandraDayO'ConnorfinishedthirdinherclassatStanfordLawSchoolin1952shecouldnotfindworkatalawfirmbecauseshewasawoman.ShebecameanArizonastatesenator参议员andin1981thefirstwomantojointheU.S.SupremeCourt.O'Connorgavethedecidingvoteinmanyimportantcasesduringher24yearsonthetopcourt. RosaParks1913﹣2005 OnDecember11955inMontgomeryAlabamaRasaParkswouldnotgiveupherseatonabustoapassenger.HersimpleactlandedParksinprison.ButitalsosetofftheMontgomerybusboycott.Itlastedformorethanayearandkickedoffthecivil﹣rightsmovement.TheonlytiredIwaswastiredofgivinginsaidParks. 1WhatisJaneAddamswell﹣﹣knownforinhistory? A.Hereffortstowinaprize. B.Herlackofpropertraininginlaw. C.Hersocialwork. D.Hercommunitybackground. 2WhatisthereasonforO'Connor'sbeingrefusedbythelawfirm? A.Herlackofpropertraininginlaw. B.Herlittleworkexperienceincourt. C.Thediscriminationagainstwomen. D.Thepoorfinancialconditions. 3Whomadeagreatcontributiontothecivil﹣rightsmovementintheUS? A.JaneAddams. B.RosaParks C.SandraDay D.RachelCarson. 4Whatcanweinferaboutthewomenmentionedinthetext? A.Theyarehighlyeducated. B.Theyaretrulycreative. C.Theyarepeace﹣lovers. D.Theyarepioneers.
已知∠AOB=60°OC是∠AOB的平分线点D为OC上一点过D作直线DE⊥OA垂足为点E且直线DE交OB于点F如图所示.若DE=2则DF=.
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BecausemostJapanesepeopledon'treallyliketheideaofhavingaroommatealotoftheseyoungpeopleenduplivingaloneincludingyoungwomen.WhileTokyoismuchsaferthanlargecitiesinmanyothercountriescrimesdohappenandcriminalsoftenconsideryoungwomenwholivealonetobeeasytargets. Tohelpaddressthisproblemandalsotoputthemindsoffemaletenants房客ateaseapartmentmanagementcompanyLeoPalace21hasdevelopedwhatitcallstheManontheCurtainsystem. Usingaprojector投影仪controlledbyasmartphoneManontheCurtainthrowsanoutlineofamanontoyourcurtainssothatwhenpeopleoutsidelookatyourwindowstherewillappeartobeaguyinsidethusmaskingthatyoulivealone.Ifyou'rewonderinghowthat'sbetterthanjustputtingacardboardcutout剪贴画byyourwindowManontheCurtainisfull﹣motionprojectingvideosofactualactorsforanextremelylifelikelook. Currentlythesystemhas12differentoptionsincludingsuchfrighteningroutinesasabodybuilderworkingoutwithdumbbellsandasportsfanswingingabaseballbataroundwhichseemslikeitcoulddoubleasafitnessvideothatyoucoulddoyourselftogetherwithyourshadowyprotector. Sinceit'dbeeasytoinferthatashortsetpatternisafakeeachvideoisroughly30minuteslongwithavarietyofmotions. Grantedsomeoftheoptionssuchasthemanvacuumingorplayingguitararen'tgoingtobeaseffectiveifawould﹣becriminaliscloseenoughtothewindowtonoticethelackofsound.Buttheimagesthemselvesareveryconvincing. 1Whichofthefollowingstatementsisright? A.Tokyoisacityofnocrime. B.LadiesareeasilyrobbedinJapan. C.Onlyyoungladiesenjoybeingalone. D.LeoPalace21worksonapartmentaffairs. 2WhatistrueabouttheManontheCurtainSystem? A.It'sapopularmobileAPP. B.Itcanfindcriminalbehaviors. C.Itplaysavividcartoonfortenants. D.It'smainlydesignedforfemalelivingalone. 3WhatdoweknowaboutParagraph3? A.Cutoutsarebetterthanthesystem. B.Cutoutsaren'teffectiveatall. C.Peoplemaythinkyouarenotalone. D.Youcanwatchvideoswhenalone. 4Whatcanweinferaboutthesystemfromthelastparagraph? A.Itmaybeimprovedbythecompany. B.Itsvideowilllastlonger. C.Itsmotionsaren'tvividenough. D.Itwon'tbewellreceived.
如图直线y=4﹣x与双曲线y=交于AB两点过B作直线BC⊥y轴垂足为C则以OA为直径的圆与直线BC的交点坐标是.
Celebrities名人likeOliviaMunnaswellasfashioncompanieslikeCucciandVersaceareamongthosewhohavebeenopposed1wearinganimalfur.NowSanFranciscohasbecomethe2largecityintheUSAtobanretailersfromsellingnewfurtotheircustomers. Thebanaimstosend3strongmessagetothefurindustry4thecrueltytheseanimalsendureforthepurposeof5becomeclothingisnotconsistentwiththevalueofthecity. AsweallknowWestHollywoodbecamethefirstAmericancity6forbidthesaleofnewfuritemsin2011andBerkeleypassedabanonthesaleoffurclothingin2017.Additionallyin2000theUKledthecharge打头阵7followbyAustraliain2004.MorerecentlytheNetherlandstheEuropeanUnion'smaproduceroffurbannedfurfarmingin2012andplanstoendmink貂farmingby2024.In2018Norwaybannedfurfarmsand8endfoxandminkfarmingby2025. Hopefullyonlywheneffortslikethesearemadetoencourage9consumetostopbuyingrealanimalfur10thelivesofanimalsbefurtherprotectedallovertheworld.
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