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在△ABC中,角A,B,C所对的边分别为a,b,c,已知2b+c=2acosC. (1)求角A; (2)若b=3,a﹣c=2,求△ABC的面积.
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高二下学期数学《》真题及答案
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在△ABC中内角A.B.C.所对的边分别为abc.已知acosC+ccosA=2bcosA.1求角A
在△ABC中已知角
,
,
所对的边分别为a,b,c,且a=3,c=8,B.=60°,则△ABC的周长是( ) A.17,B.19,C.16,
18
三角形ABC中角A.BC所对的边分别为abc已知求边C.及面积S.
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在△ABC中角A.B.C.所对的边分别为abc已知b=3c=8角A.为锐角△ABC的面积为6.1求角
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锐角△ABC中角ABC所对的边分别为abc已知 .
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在△ABC中角A.B.C.所对的边分别为abc.已知bcosC+ccosB=2b则=.
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8分Something'shappeningatthelowestpointonourplanetsome1388feetbelowsealevel. TheDeadSeaasaltlakeclosetoIsraelJordanandtheWestBankisshrinkingatanalarmingrate﹣about3.3feetperyearaccordingtotheenvironmentalistgroupEcoPeaceMiddleEast.Andhumanactionsarelargelytoblame. It'snotjustlikeonecountryispunishingtheDeadSeait'smorelikethewholeregionsaidphotographerMoritzKüstnerwhovisitedtheareainFebruarytoworkonhisseriesTheDyingDead. TheDeadSeaneedswaterfromtheothernaturalsourcessurroundingitsuchastheJordanRiverbasin.Butaroundthe1960ssomeofthewatersourcesitrelieduponwerediverted. Mineralextractionindustriesareanothermainreasonwhythewaterlevelsaredecliningexpertssay.TheDeadSea'smineralshavebeenpopularfortheirmedicalpowerandcanoftenbefoundincosmetics化妆品andotherconsumerproducts. Andthenofcoursethere'stheMiddleEast'shotdryclimatewhichmakesitdifficultforthelaketorefillitself. LastyearIsraelandJordansigneda$900milliondealinanefforttostabilizetheDeadSea'swaterlevels. ItinvolvesbuildingacanalfromtheRedSeatotheDeadSeasothatbothcountrieswouldbeabletonotonlysupplywatertoIsraelandJordanbutalsotopumpmuchneededwater﹣some300millioncubicmetersannually﹣intotheDeadSea. ThisisthemostimportantandsignificantagreementsincethepeacetreatywithJordanin1994saidSilvanShalomIsrael'senergyandwaterresourcesministeratthetime. Whetherthecanal﹣estimatedtotakethreeyearstocomplete﹣willworkoutpositivelyandasplannedremainstobeseen. 32.MoritzKüstnervisitedtheDeadSeato. A.shootTVseriesaboutpeople'sactionthere B.makeasurveyaboutthesealevel C.dohisphotographicserieswork D.researchintoenvironmentalproblems 33.WhichofthefollowingstatementsisNOTthereasonforthewaterlevels'declining? A.TheothernaturalsourcestheDeadSeareliedonwereswitched. B.TheDeadSea'smineralshavebeendugandusedinsomeproducts. C.TheMiddleEast'sclimatemakesthelakeitselfdifficulttostorewater. D.IsraelandJordanarethetwocountriestodestroytheDeadSea. 34.WhatmeasurehasbeentakentosavetheDeadSea? A.BringinginwaterfromtheRedSea. B.IntroducingwaterfromIsraelandJordan. C.TakingIsrael'senergyandwaterresources. D.Strugglingforinternationalsupport. 35.Whatdoesthepassagemainlytellsus? A.WhytheDeadSeaisdyingandthemeasuretakentosaveit. B.HowimportanttheDeadSeaisinIsraelJordanandtheWestBank. C.HowtosolvetheproblemthattheDeadSeaisbeingdestroyed. D.Protectingtheenvironmentisinnohurryallovertheworld.
6分BuyOneGiveOne BuyOneGiveOneB1G1isaSingapore﹣basedbusinessandnon﹣profitorganizationwithajobtocreateaworldfullofgiving.Wehelpbusinessesaroundtheworldgivebackinmeaningfulwayssothattheycancreatemeasurableandlong﹣lastinginfluence.Since2007wehaveworkedwithmorethan1600businessescreatingmorethan88milliongivingactivities. Ourbusinessallowsconsumerswhomayfeeldisconnectedfromtheproblemsofthedevelopingworldtobecomeinvolvedinsocialproblemswhilestillpurchasingforthemselves.ForexampleshoebrandslikeTOMSpromisetodonateonepairofshoesforeverypairpurchased.Soapboxgivessoaptoaneedychildwitheverypurchase.WatchcompanyWeWoodplantsatreeeverytimeyoubuyawatch.Theyhavehelpedsocially﹣consciousconsumerspurchaseproductsandfeelgoodaboutprovidinghelptoothers.SeewhatsomeofourmemberssayaboutbeingapartofB1G1. *KarenOrmerod Everyproductpurchasedatourstoreinfluencesthelivesofdisadvantagedpeopleintheworld.IhadneverimaginedIwouldbeoperatingabusinessthatcouldchangepeople'slives.Wearemakingarealdifferencebyjustdoingwhatwenormallydo.Itisawonderfulexperience. *BenBaker Whatagoodwayofdistributingresourcestowheretheyneedtobegivingpeoplethegiftsofgivingandaddingvaluetoorganizationsalongtheway.Wehavealreadymade160000givingactivitiesthroughB1G1.Givinghasbecomeanecessarypartofoureverydaybusiness.It'sabsolutelybrilliant. B1G1focusesontheinfluenceofgivingonpeople'slivesratherthansimplytheamountsdonated.Ourprogramsstressgivinghabituallyinordertocreategrowinginfluencearoundtheworld.WhenyoujointheB1G1givingprogramyoucreateyourownuniquegivingstories. Wedohopeyoucanbecomeamemberofus! 56.AccordingtothepassagewhatdoesB1G1do? A.Donatetheprofitstothepeopleinneed. B.Helpconsumerspurchasetheirfavoriteproducts. C.Giveawaysomethingextrawhenaproductissold. D.Instructownershowtooperatebusinesseseffectively. 57.HowdothemembersfeelaboutthemselvesasapartofB1G1? A.Confident.B.Proud.C.Generous.D.Energetic. 58.Whatisthepurposeofthepassage? A.ToinvitebusinessestoB1G1. B.TopromotetheproductsB1G1sells. C.TodescribethegiftsB1G1gives. D.TointroducetheactivitiesB1G1involves.
10分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短文.短文中共有10处错误每句中最多有两处.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∧并在此符号下面写出该加的词. 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. Iwanttotellyouanimpressivestoryhappeningduringmyfirstlesson.Onhearingthebellthestudentsranintotheclassroomasquicklyastheycan.ButaboyLiMingwhichfatherhaddiedamonthearlierwaslatefortheclass.Hequietstoodoutsidetheclassroom.Ismiledtohimandlethimcomein.Afterawhilehecriedonhisdesk.ThenIwalkedtoherandaskedwhathadhappened.Hetoldmethathismotherwasillandthathehastobuysomemedicineforher.Atthesametimeheapologizedmeforhislateness.MovingbyhiswordsIpraisedhimforhisdeedsanddecidedtosingasongnamedMotherforthestudents.Howtimeflied!ClasswasoverwhenIrealizedit.FromthestoryIfeltweshouldshowarespectforourparentanddoourbesttohelpthem.
1分﹣﹣Ithinkthepaperistakingyoualongtimetowrite. ﹣﹣Ionitforalmostamonthnow. A.worked B.wasworking C.amworking D.havebeenworking
1分﹣Iheardyouwantedtohaveafurtherstudyinaforeigncollege. ﹣Yesthat'sItrymybesttolearnEnglishwell. A.when B.how C.wha D.why
1分bytheEnglishteacherforthehighgradeIfeltmyeffortfinallypaidoff. A.Praise B.Praised C.Topraise D.Praising
10分假设你是红星中学高三学生李华.你的美国朋友Jim要来北京旅游他写信寻求你对旅游地的建议请你给他写封回信内容包括 1.景点名称 2.参观内容 3.推荐理由. 注意1.词数不少于50 2.开头和结尾已给出不计入总词数. DearJim Yours LiHua.
1分exactlywhatwaswrongwithhimthedoctorsgavehimacompleteexamination. A.Todiscover B.Discovering C.Discovered D.Havingbeendiscovered
1分Theinnerstrengthofthegirlallowshergoingwhenshegetsintotrouble. A.keep B.keeping C.tokeep D.kept
8分Wehaven'tfoundanythingthatwecan'trecycle! Cigaretteendsareeverywhere﹣litteringourstreetsandbeaches﹣andfordecadesthey'vebeenthoughtofasunrecyclable.ButaNewJerseybasedcompanycalledTerraCyclehastakenonthechallengeandhascomeupwithawaytorecyclemillionsofcigaretteendsandturnthemintoindustrialplasticproducts.Itsaimistorecyclethingsthatpeoplenormallyconsiderimpossibletoreuse. Obviouslyitwouldbeevenbetterfortheenvironmentifeveryonejuststoppedsmokingbutthestatisticsshowthatalthoughtherehasbeenanincreaseinanti﹣smokingadsandmessagingbetween2000and2014globalsalesofcigarettesincreasedby8percentandawholelotofthosecigaretteendsareendingupastrash.Sincemostofourlittereventuallyendsupinwaterwayscigaretteendscansurelypollutethesurroundingenvironment.ItonlytakesasinglecigaretteendtopollutealiterofwaterTerraCyclefounderTomSzakysaid.Animalscanalsomistakelitteredcigaretteendsforfood. Sohowdoyougoaboutturningallthosepoisonousendsintosomethinguseful?TerraCycledoesthisbyfirstbreakingthemdownintoseparateparts.Theymixtheremainingmaterialssuchasthetobaccoandthepaperwithotherkindsofrubbishanduseitonnon﹣agriculturallandsuchasgolfcourses.Thefilters过滤嘴arealittleharder.TorecycletheseTerraCyclefirstmakesthemcleanandcutsthemintosmallpiecesandthencombinesthemwithotherrecycledmaterialsmakingthemintoliquidforindustrialplasticproducts. They'renowalsoexpandingtheirrecyclingofferingstotherestofthe80percentofhouseholdwastethatcurrentlycan'tberecycledsuchaschocolatepackagingpensandmobilephones.Thegoalistousethelatestresearchtofindawaytostopsomuchwasteendingupinlandfill垃圾填埋andthengetcompaniestoprovidemoneyfortheprocess.Andsofarit'sworking. Wehaven'tfoundanythingthatwecan'trecyclecommunicationsdirectorofTerraCycleAlbeZakessaid.Butwiththeamountandvarietyofpackagingandlitterintheworldwearealwayslookingfornewwastestreamstoaddress. 63.WhatdoesTerraCycleintendtodo? A.Searchforrecyclablematerialsforuse. B.Dealwithasmanycigaretteendsaspossible. C.Producenewkindsofindustrialplasticproducts. D.Recyclewhatusedtobeconsideredunrecyclable. 64.TheunderlinedwordtrashinParagraph2probablymeans. A.rubbishB.poisonC.disasterD.ruin 65.WhatdoesParagraph3mainlytalkabout? A.Theeffectiveuseofcigaretteends. B.Theprocessofrecyclingcigaretteends. C.Thedifficultyinrecyclingcigaretteends. D.Thereasonforbreakingdowncigaretteends. 66.WhatAlbesaidinthelastparagraphimpliesthat. A.thereismoreandmorewastetoberecycled B.itisdifficultforTerraCycletorecycleeverything C.TerraCycleistryingtomeetthechallengeofnewwaste D.TerraCyclehassuccessfullyrecycledalargeamountofwaste.
1分Wehavealearningcenterkidsdoindependentandself﹣directedlearningactivities. A.which B.when C.where D.whose
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