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在圆心为O，半径为2的圆内接△ABC中，角A，B，C的对边分别为a，b，c，且a4﹣2a2（b2+c2）+c4+b4+b2c2＝0，则△OBC的面积为 ．
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高一下学期数学《》真题及答案
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已知圆内接△ABCAB=AC圆心O到BC的距离为3cm圆的半径为7cm腰长AB=．
如图在△ABC中∠ABC=90°.1作∠ACB的平分线交AB边于点O再以点O为圆心OB的长为半径作⊙
如图已知⊙O.的半径为1∠BOC是⊙O.中的圆心角△ABC是⊙O.内接三角形DE是三角形的中位线与s
DE
EC
BD
BC
如图⊙O.的半径是5△ABC是⊙O.的内接三角形过圆心O.分别作ABBCAC的垂线垂足分别为E.F.
2016年·海口一中三模平面a截半径为R的球O得到一个半径为的截面圆O′三棱锥S﹣ABC内接于球O
在△ABC中abc分别是角A.B.C.的对边且a＝2b＝3cosC.＝则其外接圆半径为_______
在△ABC中abc分别是角A.B.C.的对边且a＝2b＝3cosC.＝则其外接圆半径为_______
如图⊙O的半径为10则⊙O.的内接正三角形ABC的边长为_____
在AutoCAD中用CIRCLE命令在一个三角形中画一内接圆在提示3P／2P／TTR下应采用最佳
2P方式
TTR方式
3P方式
先手工计算好圆心坐标、半径、用圆心、半径方式
△ABC内接于⊙O.且AB=AC点O.到BC的距离为3圆的半径为5则AB的长是.
如图⊙O.的半径是5△ABC是⊙O.的内接三角形过圆心O.分别作ABBCAC的垂线垂足为E.F.G.
如图在Rt△ABC中∠ABC=90°.1利用直尺和圆规按下列要求作图保留作图痕迹不写作法①作∠BCA
平面a截半径为R的球O得到一个半径为的截面圆O′三棱锥S﹣ABC内接于球O且△ABC是圆O′的内接
1如图1设正三角形ABC的外接圆圆心为O.半径为R.将其沿直线l向右翻滚当正三角形翻滚一周时其圆心O
如图△ABC内接圆于⊙O.∠B.=30°AC=2cm则⊙O.半径的长为_______cm.
如图AD为⊙O.的直径作⊙O.的内接正三角形ABC.甲乙两人的作法分别如下甲1.作OD的中垂线交⊙O
甲、乙均正确
甲、乙均错误
甲正确，乙错误
甲错误，乙正确
如图⊙O.的半径是5△ABC是⊙O.的内接三角形过圆心O.分别作ABBCAC的垂线垂足分别为E.F.
△ABC内接于以O为圆心1为半径的圆且则的值为
△ABC是以AB为直径的⊙O的内接三角形已知AB=10BC=6则圆心O到弦BC的距离是.
如图⊙O.的半径是5△ABC是⊙O.的内接三角形过圆心O.分别作ABBCAC的垂线垂足为E.F.G.
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30分OnFridayIcalledmyparentswhoareintheirearly90snowTheywere41astheyadmittedtheydidn'tknowwhattosendmeormyadultkidsandtheirfamiliesforChristmaspresentsBothofthemveryrecentlyhave42serioushealthproblemsandI43themnottoworrythemselvesandtoldthemallofushadwhatwe44anddidn'tneedanythingmoreifthe45betold. Nothappywiththatthey46gettingusallsomethingeventhoughthisyearItwouldhavetobe47thanusualforitwaseasytosendtousall.Mymothersaidthatshewasgivingtheotherbrothersandsistersfruitand48basketswhichgavemeanidea.Iaskedherto49inthatcasegivingwhatevershewouldhavegivenustoalocalfoodbank.Oritismucheasierto50whatevermoneyshewouldspendonallofustothefoodbank.WhenIcheckedwiththemtheyboth51agreedandallofuswouldbehappyactuallyvery52toknowwehadbeenabletodonatefoodtoalocalfoodbank. Sheandmyfatherlikedthis53buthadnoideawhereafoodbankwouldbe.54myfatherwasquiteableand55indoinghisowncomputersearchesrecentlyhisabilityormotivationtodothishassteadilybeen56.Ilookedituprightthereandthen57notonebutthreelocalfoodbanksandthecenterforastate﹣widefoodbankwaslocatedrightthereintheirtown.Igavethemthe58andphonenumberwhichtheyaskedfor.Theyseemedvery59bythisproposedsolutionandIwasverygrateful.Anditisallsotrue.Iamoverthemoonhappywiththispresentidea.And60iseveryoneelse. 41.A.satisfied B.upset C.excited D.surprised 42.A.defeated B.solved C.suffered D.burdened 43.A.ordered B.encouraged C.criticized D.comforted 44.A.worried B.found C.needed D.sought 45.A.truth B.news C.information D.advice 46.A.gaveup B.dreamtof C.endedup D.insistedon 47.A.more B.faster C.slower D.less 48.A.flower B.goods C.food D.clothing 49.A.admit B.consider C.avoid D.allow 50.A.donate B.pay C.collect D.save 51.A.angrily B.willingly C.patiently D.deliberately 52.A.delighted B.disappointed C.astonished D.bored 53.A.basket B.idea C.story D.family 54.A.Unless B.When C.If D.Although 55.A.involved B.lost C.interested D.confident 56.A.increasing B.developing C.lacking D.declining 57.A.discovered B.realized C.understood D.recognized 58.A.name B.address C.picture D.money 59.A.stressful B.embarrassed C.relieved D.nervous 60.A.so B.neither C.such D.nor
8分A.R.RahmanoneofIndia'smostwell﹣lovedmusiccomposerswoninternationalrecognitionwithtwoGrammyawards.LastyearhewontheOscarforhismusicinthehitfilmSlumdogMillionaire.ThisyearhehadhisfirstGrammywin.HepickeduptwoawardsonefortheBestCompilationSoundtrackforaMotionPictureSlumdogMillionaireandtheotherforBestMotionPictureSongforthesongJaiHofromthesamefilm.InthebestsongcategoryRahmanbeatsingerBruceSpringsteenandhissongTheWrestlerfromthemovieofthesamename.ThemodestRahmansaidThisismadGodisgreatagain. A.R.RahmanisacomposermusicProducermusicianandsinger.Hismusicscores乐谱andfilmsongssongschangedthecharacterofpopularmusicinIndiaintheearlyl990s.Rahman'smusiccompletelydissolvedthedividebetweenIndianandWesterncategories.Hepopularizedclassicalaswellasexperimentalmusic.Rahmanalsodiscoveredmanyyoungmusiciansanssingers. InterestinglytwootherIndianartistes艺人werenominatedforGrammysthisyear.UstadAmjadAliKhanIndia'smostwell﹣knownsarod萨罗达琴playerwasnominatedintheBestTraditionalWorldMusicAlbumcategoryforhisalbumAncientSounds.ZakirHussainthefamousTablamaestrowasnominatedintheBestClassicalCrossoverAlbumcategoryforhisalbumTheMelodyofRhythm.ZakirHusainwonaGrammylastyear.TheotherIndianswhohavewonGrammysinthepastarePanditRaviShankarVikkuVinayakramandVishvamohanBhatt. TheGrammyAwardscameintobeingin1958.ThesemusicawardsarepresentedeveryyearbytheNationalAcademyofRecordingArtsandSciencesoftheUSA.TheywereoriginallynamedtheGramophoneAwardsforthegramophone留声机wasthefirstinventionthatcouldrecordandreplaysoundanditwaswidelyusedthroughmostofthetwentiethcentury. 25.HowmanyfilmshasRahman'sprize﹣winningmusicbeenwrittenforsincelastyear? A.One. B.Two. C.Three. D.Four. 26.Whohasn'treceivedaGrammyawardinthepast? A.UstadAmjadAliKhan. B.PanditRaviShankar. C.ZakirHusain. D.VikkuVinayakram. 27.WhywastheGrammyAwardsonceregardedasGramophoneAwards? A.BecausethegramophonewasinventedintheUSAin1958. B.Becausethegramophonewasusefulanditsrangeofinfluencewaswide. C.Becausethegramophonehaslastedlongsinceitcameintobeing. D.BecausethegramophonewasfirstusedattheGrammyAwards. 28.Fromthispassagewecanlearn. A.Rahmanhasreceivedtwoawardssincelastyear B.Rahmanisacomposermusicproducermusicianandactor C.Rahmanusedtobemadbeforebeingfamous D.fiveIndianshavereceivedtheGrammyawards.
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下列说法正确的是
15分Communicationandtransportationnetworksbringpeopletogether.Yetsometimespeoplethemselvescreatebarriers.Insomecountrieslawsstoppeoplefrom61movefreelyfromplacetoplace. Inthepastmanygroupsofpeopleweredeniedthe62freetotravelbecauseoftheirracereligionornationality.CountriesalsosetupCustomspostsat63themborders.ForeigntravelershastogothroughaCustomsinspectionbeforethey64allowtotravelinthecountry. Manyofthoseharriersalsoacted65barrierstocommunication.Whentwo66governmentdisagreedwitheachotheronimportantmatterstheyusuallywouldnotwanttheircitizenstoexchangenewsorideasfreely.Countriesoftentriedtokeepmilitaryor67industryinformationsecret. Todaypeoplehavetheabilitytotraveltocommunicateandtotransportgoodsmorequicklyandeasily68everbefore.Naturalbarriers69usedtobedifficultordangeroustocrossahundredyearsagocannowbecrossedeasily.Thebarriers70makebypeoplearenorsoeasytoovercomebutinspiteofallkindsofbarrierspeoplecontinuetoenjoytravelingandtheexchangeofgoodsandideas.
8分WASHINGTON﹣Thousandsofpublicschoolsstoppedteachingforeignlanguagesinthelastdecadeaccordingtoasurvey.ButanothercontrarytrendhaseducatorsandpolicymakersabuzzarushbyschoolsinallpartsofAmericatoofferinstructionsinChinese. SomeschoolsarepayingforChineseclassesontheirownbuthundredsaregettingsomehelp.TheChinesegovernmentissendingteachersfromChinatoschoolsallovertheworld﹣andpayingpartoftheirsalaries. Noonekeepsanexactcountbutroughcalculationsbasedonthegovernment'ssurveysuggestthatperhaps1600AmericanpublicandprivateschoolsareteachingChineseupfrom300orsoadecadeago.Andthenumberisgrowingexponentially成倍地. It'sreallychangingthelanguageeducationlandscapeofthiscountrysaidNancyC.Rhodesdirectoratthecenter.Otherindicatorspointtothesametrend.ThenumberofstudentstakingtheAdvancedPlacementtestinChineseintroducedin2007hasgrownsofastthatitislikelytopassGermanthisyearasthethirdmost﹣testedA.P.languageafterSpanishandFrenchsaidTrevorPackervicepresidentattheCollegeBoard. We'veallbeensurprisedthatinsuchashorttimeChinesewouldgrowtosurpassA.P.GermanMr.Packersaid. AdecadeagomostoftheschoolswithChineseprogramswereontheEastandWestCoasts.ButinrecentyearsmanyschoolshavestartedChineseprogramsinheartlandstatesincludingOhioandIllinoisintheMidwestTexasandGeorgiaintheSouthandColoradoandUtahintheRockyMountainWest. Americahashadthestudyofaforeignlanguagegrowbeforeonlytoseethebubbleburst.ManyschoolsbeganteachingJapaneseinthe1980safterJapanemergedasaneconomicrival.Butthousandshavedroppedthelanguagethesurveyfound.Japaneseisnottheonlylanguagethathasdeclined.ThousandsofschoolsthatofferedFrenchGermanorRussianhavestoppedteachingthoselanguagestoothesurveyfound. 25.What'sthemeaningoftheunderlinedwordabuzzinthefirstparagraph? A.Benoisylikethesoundofabee. B.Belivelyforvariousactivities. C.Causepeopletodiscusssomethinghotly. D.Motivatepeopletomarchbravely. 26.WhatcanweinferfromwhatMr.Packersaid? A.MoreandmorepeoplechooseChineseinA.P.test. B.A.P.testisthemostdifficultoneintheworld. C.ChineseismoreimportantthanSpanishandFrench. D.Chineseisanecessarysubjectinmostimportanttests. 27.Whatcanweknowfromthelasttwoparagraphs? A.ManyschoolsstartedChineseprogramsintheMidwesttenyearsago. B.ChineseprogramshavebeenstartedinmoreareasinAmericarecently. C.AmericanschoolshavestoppedteachingFrenchGermanandRussian. D.PeoplearegraduallyfondoflearningChineseandJapaneseinrecentyears. 28.Whatisthemainideaofthepassage? A.ChineseisbeinglearnedasanofficiallanguageinAmerica. B.ForeignLanguagesfadeinAmericanschoolsexceptChinese. C.TeachingChineseinforeigncountrieshasbecomeatrend. D.ForeignlanguagesarenolongerbeingtaughtinAmerica.
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
某同学学习传感器后用电源电磁继电器滑动变阻器开关导线等仪器设计了一个高温报警器要求是正常情况绿灯亮有险情时电铃报警．电路如图所示图中仪器还不完整请完成以下问题 1图中的甲还需要放入的元件是 A．二极管 B．光敏电阻 C．NTC热敏电阻阻值随温度升高而减小 D．PTC热敏电阻阻值随温度升高而增大 2电路正确连接之后该同学调试过程发现报警时温度比预期偏高了一点点．要求在温度更低一点时就开始报警则需要调节滑动变阻器的滑动头往填“左”或“右”移动一点．
下列四幅图中能正确反映分子间作用力f和分子势能EP随分子间距离r变化关系的图线是
10分Doyouknowhowtowriteagoodadvertisement?36 ●Theystressabenefit.ThemainsellingplanisnotcleverlyhiddenbutismadeimmediatelyclearforexampleHowtowinfriendsandinfluencepeople. ●Theymakepeoplecuriousabouttheadandinvitesreadership.ThekeyhereisnottobeoffensivebuttofocusonthestrongestinterestsandconcernsofyourtargetaudienceforexampleDoyoumakethesemistakesinEnglishappealstothereader'sdesiretoavoidembarrassmentandwriteandspeakproperly. ●37TheheadlineHowtoimproveyourtestscoreswhenyousleepattractsthereadersbecauseitpromisesusefulinformation.Anadthatprovidesinformationforreaderswillgethigherreadershipandbetterresponse. ●Theyareknowledgeable.38Ahelpfulwayistotellthereadersomethinghealreadyknowsprovingthatyoutheadvertiserarefamiliarwithhisindustryapplicationorrequirement. ●Theymakeastrongoffer.39Alladsshouldhaveanofferbecausetheoffercreatesimmediateresponsefrompeoplewhoarereadytobuynoworatleastthinkingaboutbuying.40 A.Theyprovideinformation. B.Letmetellyousomethingaboutthis. C.Theyneversellproductsthatarepoorinquality. D.Herearesomecharacteristicsofsuccessfulprintads. E.Withoutanofferthesepeoplearenotencouragedtoreachyou. F.Theyreflectahighlevelofknowledgeandunderstandingoftheproduct. G.Goodadstellthereaderswhattodonextandencouragethemtotakeitnow.
某同学做“用油膜法估测分子的大小”的实验． ①每滴油酸酒精溶液的体积为V0将该溶液滴一滴到水面上稳定后形成油膜的面积为S．已知500mL油酸酒精溶液中含有纯油酸1mL则油酸分子直径大小的表达式为d＝． ②该同学做完实验后发现自己所测的分子直径d明显偏大．出现这种情况的原因可能是． A．将滴入的油酸酒精溶液体积作为油酸体积进行计算 B．油酸酒精溶液长时间放置酒精挥发使溶液的浓度发生了变化 C．水面上痱子粉撒得太多油膜没有充分展开 D．计算油膜面积时将不完整的方格作为完整方格处理．
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. ImadeabigmistakeinthechemicallessonlastFriday.Whenwewereinthelabmyheadwasstillfilledwiththeinformationsofafootballmatch.Sawtheothersbeginningtheexperiment.Ijustcopiedthemwithoutconsideringthattheteacherhadsaid.Allofthesuddenthematerialinthecuponmydeskwascaughtfire.Iwasshockedanddidn'tknowwhattodo.Unluckilymyteacherhelpedmeputoutthefireonsandquickly.Ifeelveryashamed.NotuntilthenIrealizethatcarelessnesswasharmfulinscience.
1分exactlywhatwaswrongwithhimthedoctorsgavehimacompleteexamination. A.Todiscover B.Discovering C.Discovered D.Havingbeendiscovered
30分LiJia14amiddleschoolgirlinMeishansouthwestChina'sSichuanProvincehasbeentryingtoputonweight.Shehopestosavehermotherwhois41withleukemia白血病.Sofarshehas42around10kilogramsinhalfayearandhopesthatitwillbeenoughto43hertodonatebonemarrow骨髓toherparent. Thedoctoraskedhermothertohavebonemarrowtransplantationin2015asherconditionbecame44daybyday.ThinkingthatLiJiamaybea45marrowdonorforhermotherthedoctorsuggestedthatthegirlgainsomeweightsince46weightsbetweenthedonorandthereceiverwillhelpgeneratebetterresultsforboth. Thegirldecidedtohavehigh﹣caloriefoodsthatarenormally47byboysandgirlsofherage.Friedpotatoesporkandvarioussnackswereall48servedinherdailydiet. Aftermonthsofeffortsthegirl49hergoalofincreasingto60kilograms.Whilemanyofherbeautifuldresseshavebecometoo50shesaidTheseclotheswillfitagainoneday.Butifmomcan'tbe51nobodywillbetheretoseemegrowingup. PuttingawayherbelovedclothingsheboughtherselfloosejeansandT﹣shirtswhichshethoughtwould52herfat. Butshehasbeenteasedbysomeofherclassmatesunawareofthe53.Toallthequestionsabouthowshehadgainedsomuchweightinsuchashortperiodshesimplyrepliedwitha54andthendroppedherhead. ThisMaythe55finallycameout.Shecandonateherbonemarrowtothefamilymember. 56asshewasthemother57overthedonationafterlearningaboutthesufferingand58itcouldbringtohergirl59LiJiarefusedtochangehermind. I'mnotafraidofallthese.TheonlythingI60isthatIwillJoseyousheclaimed. 41.A.diagnosing B.struggling C.developing D.suffering 42.A.reduced B.lost C.gained D.wasted 43.A.allow B.tell C.force D.persuade 44.A.less B.worse C.lighter D.better 45.A.potential B.rare C.generous D.brave 46.A.different B.extra C.similar D.heavy 47.A.refused B.produced C.designed D.donated 48.A.narrowly B.occasionally C.hardly D.regularly 49.A.realized B.recognized C.referred D.planned 50.A.loose B.old C.tight D.priceless 51.A.welcomed B.treated C.cured D.comforted 52.A.display B.show C.avoid D.cover 53.A.situation B.condition C.environment D.trend 54.A.hug B.smile C.shout D.laugh 55.A.causes B.projects C.results D.bills 56.A.Happy B.Curious C.Afraid D.Weak 57.A.argued B.turned C.cancelled D.hesitated 58.A.joy B.harm C.benefit D.crisis 59.A.unless B.so C.but D.as 60.A.know B.insist C.miss D.fear
如图所示一个半径为R的透明球体放置在水平面上一束蓝光从A点沿水平方向射入球体后经B点射出最后射到水平面上的C点．已知OA＝R该球体对蓝光的折射率为．则 ①它从球面射出时的出射角β为多少 ②若光在真空中的传播速度为c那么请推导出光从A点传播到C点所需时间t的表达式用cR表示
25分假定你是李华Tom是你的美国好友他三年前来过你所在的城市.最近他写信询问你所在城市的变化.请你根据以下要点给他写一封回信. 要点1.谢谢他的来信 2.列举城市的一些变化 3.欢迎他再次来玩. 注意1.词数100左右 2.可以适当增加细节以使行文连贯. .
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