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设F1,F2分别为双曲线C:(a>0,b>0)的左、右焦点,过F1的直线交双曲线C左支于A,B两点,且|AF2|=6,|BF2|=10,|AB|=8,则双曲线C的离心率为 .
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高二下学期数学《》真题及答案
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已知m>1直线x-my-m2/2=0椭圆C://x2/m2+y2=1F1F2分别为椭圆C的左右焦点.
设点P.在双曲线-=1ab>0的右支上双曲线的左右焦点分别为F.1F.2若|PF1|=4|PF2|则
已知F.1F2分别是椭圆E.:+y2=1的左右焦点F1F2关于直线x+y-2=0的对称点是圆C.的一
若双曲线-=1a>0b>0的左右焦点分别为F1F2线段F1F2被抛物线y2=2bx的焦点分成7∶3的
已知双曲线-=1a>0b>0的左右焦点分别为F.1F.2点P.在双曲线的右支上且|PF1|=4|PF
已知
是双曲线
=1(a>0,b>0)的左顶点,F.
1
、F.
2
分别为双曲线的左、右焦点,P.为双曲线上一点,G.是△PF
1
F.
2
的重心,若
,则双曲线的离心率为( ) A.2
3
4
与λ的取值有关
若双曲线的左右焦点分别为F1F2线段F1F2被抛物线的焦点分成53两段则此双曲线的离心率为_____
设双曲线-=1的左右焦点分别为F.1F2过F.1的直线l交双曲线左支于
B.两点,则|BF2|+|AF2|的最小值为( ) A.
11
12
16
设双曲线的左右焦点分别为F1F2.若点P在双曲线上且△F1PF2为锐角三角形则|PF1|+|PF2
双曲线的左右焦点分别为F1F2直线l过F2且与双曲线交于AB两点 1若l的倾斜角为是等边三角形求双
本题共有2个小题第1小题满分6分第2小题满分8分 双曲线的左右焦点分别为F1F2直线l过F2且与双
设椭圆的左右焦点分别为F1F2右顶点为A上定点为B已知 求椭圆的离心率
设双曲线x2–=1的左右焦点分别为F.1F.2.若点P.在双曲线上且△F.1PF2为锐角三角形则|P
已知双曲线C.a>0b>0的左右焦点分别为F1F2点M.与双曲线C.的焦点不重合点M.关于F1F2的
,
,线段MN的中点在双曲线的右支上,若|AN|﹣|BN|=12,则a= A.3B.4
5
6
设F1F2分别为双曲线-=1a>0b>0的左右焦点.若在双曲线右支上存在点P.满足|PF2|=|F1
3x±4y=0
3x±5y=0
4x±3y=0
5x±4y=0
已知双曲线-=1a>0b>0的左右焦点分别为F1F2以F1F2为直径的圆与双曲线在第一象限的交点为P
如图所示F1F2是双曲线a>0b>0的两个焦点以坐标原点O.为圆心|OF1|为半径的圆与该双曲线左支
,B,且ΔF2AB是等边三角形,则双曲线的离心率为 A.
( )
已知双曲线C.a>0b>0的左右焦点分别为F1F2点M.与双曲线C.的焦点不重合点M.关于F1F2的
,
,线段MN的中点在双曲线的右支上,若|AN|﹣|BN|=12,则a= A.3B.4
5
6
设双曲线-=1的左右焦点分别为F.1F2点P.为双曲线上位于第一象限内的一点且△PF1F2的面积为6
设双曲线C.b>a>0的左右焦点分别为F.1F.2.若在双曲线的右支上存在一点P.使得|PF1|=3
(1,2]
(1,2)
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Ifyouarehavingtroublefallingasleepyouarenotalone.About65%ofAmericanssaidtheyhavesleepingproblemsafewnightseachweekaccordingtoarecentstudybytheNationalSleepFoundation.Sleepingtoolittlecanleadtoahigherriskofbecomingfatandgettingdepressed沮丧的.Butbeforeyougotoadoctorforadviceitisworthexaminingyoursleepinghabitsonemoretime.Someofyourfavoriteeveninghabitsmayhavesomethingtodowiththesleepingproblems. SettingaBrightAlarmClock Thelightofyourbrightalarmclockcanpreventyoufromfallingasleep.Youcanmakeyourroomasdarkaspossible.Coverthebrightnumberswithabookorconsiderbuyingasmalltravelclock.Yourcellphonealarmmayalsodothetrick. CountingSheep Whenyoujustcan'tfallasleepit'suselesstostayinbedtocountsheep.Ifyou'vebeentryingtofallasleepformorethan30minutestheNationalSleepFoundationsuggestsyougetuptodosomereadingorwatchTVforawhile.Suchactivitieswillmakeyousleepy.Beforeyouknowityou'llbegoingbacktobedreallytired. ExercisingLateatNight Daytimeworkouts锻炼willkeepyoufullofenergyforhours.That'swhyyoudon'twanttoexercisewithinthreehoursofhittingthesack.Fierce剧烈的physicalactivityraisesyourbodytemperatureandpumpsyourenergylevel﹣botharebadforagoodnight'ssleep. 1Whatcanwelearnfromthefirstsentenceofthepassage? A.It'snotgoodtofailtofallasleepatnight. B.Peopleinagoodcompanyoftenhavesleepingproblems. C.Therearemanypeoplewhohavesleepingproblems. D.Youshouldfindsomeonetotalktoifyoucan'tfallasleep. 2Theunderlinedparthittingthesackinthelastparagraphmeans. A.goingbackhome B.goingtobed C.goingtothegym健身馆 D.fallingasleep 3Bywritingthepasagethewritermainlywantstotellus. A.whysomanypeoplecan'tsleepwellatnight B.howtoenjoyagoodnight'ssleep C.thatsleepingproblemsaretroublingmoreandmorepeople D.thatpeoplemaysolvetheirsleepingproblemsbysomehabits
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位于湖南省西北部距离湖南省会长沙约300公里占地面积9563平方千米的张家界是一座因独特的自然景色和丰富的旅游资源而闻名的旅游城市.
Mostdogownersfeelthattheirdogsaretheirbestfriends.Almosteveryonelikesdogsbecausetheytryhardtopleasetheirowners.Oneofmyfavoritestoriesisaboutadogwhowantedtheownertopleasehim.OneofmyfriendshasalargeGermanshepherd牧羊犬namedJack.Thesedogsareoftenveryintelligentclever.EverySundayafternoonmyfriendtakesJackforawalkinthepark.Jacklikestheselongwalksverymuch. OneSundayafternoonayoungmancametovisitmyfriend.Hestayedalongtimeandhetalkedandtalked.SoonitwastimeformyfriendtotakeJackforhiswalkbutthevisitordidn'tleave.Jackbecameveryworriedabouthiswalkinthepark.Hewalkedaroundtheroomseveraltimesandthensatdowndirectlyinfrontofthevisitorandlookedathim.Butthevisitorpaidnoattention.Hecontinuedtalking.FinallyJakcouldn'tstanditanylonger.Hewentoutoftheroomandcamebackafewminuteslater.Hesatdownagaininfrontofthevisitorbutthistimeheheldtheman'shatinhismouth. Germanshepherdsaren'ttheonlyintelligentdogs.AnotherintelligentdogisaSeeingEyedog.Thisisaspecialdogthathelpsblindpeoplewalkalongthestreetsanddomanyotherthings.WecallthesedogsSeeingEyedogsbecausetheyaretheeyesoftheblindpeopleandtheyhelpthemtosee.SeeingEyedogsgenerallygotospecialschoolsforseveralyearstolearntohelpblindpeople. 1Jackcametositinfrontofthevisitorinorderto. A.pleasehim B.bepleased C.askhimtoleaveimmediately D.invitehimforawalk 2WhatdoesitinthesentenceJackcouldn'tstanditanylongerreferto? A.hiswalkingaroundtheroomseveraltimes B.hissittinginfrontofthevisitor C.hisowner'svisitor'ssayingandtalking D.hiswalkinginthepark 3SeeingEyedogs. A.aremoreintelligentthanGermanshepherds B.haveonlyoneeye C.helpblindpeoplegotospecialschools D.helpandseeforblindpeople 4WhichofthefollowingstatementsisRIGHT? A.Mostdogsareveryintelligent. B.ItusuallytakesseveralyearsforSeeingEyedogstolearntohlpblindpeople. C.Germanshepherdsarethemostintelligentdogsintheworld. D.SeeingEyedogscanonlyhelpblindpeoplewalkalongthestreets.
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目前青少年压力过大为排解压力一些青少年染上了一些恶习如吸烟饮酒吃垃圾食品上网成瘾等请你以学生会的名义参照以下提示用英语写一封倡议书呼吁中学生要养成好习惯过健康生活.要点如下 1.青少年中存在的恶习以及它们的危害.恶习和危害各至少2点 2.好习惯的重要性和必要性.至少2点 3.呼吁你校学生养成好习惯过健康生活. 注意 1.词数120左右开头语已为你写好其词数不计入总数 2.可以适当增加细节以使行文连贯 3.文中不得透露个人姓名和学校名称.
AfatherwasworriedabouthissonsohisfatherdecidedtocallonaBuddhistmonk禅师totrainhisboy1wassixteenyearsoldbuthadnocourageatall. TheBuddhistmonksaid2theboy'sfatherYoushouldleaveyoursonalonehere.I'llmakehimintoarealmanwithinthreemonths.3youcan'tcometoseehimduringthisperiod. Threemonthslatertheboy'sfatherreturned.TheBuddhistmonkarrangedaboxingmatchbetweentheboyandan4experienceboxer.Eachtimethefighter5striketheboyhefelldownbutatoncetheboystoodupandeachtimetheboywasknockeddowntheboystoodupagain.SeveraltimeslatertheBuddhistmonkasked6doyouthinkofyourchild?Whatashame!theboy'sfathersaidIneverthoughthewouldbeso7easyknockeddown.Ineedn'thavehimlefthere8longer. Iamsorrythatisallyousee.Don'tyouseethateachtimehefallsdownhestandsupagaininsteadof9cry?That'sthekindofcourageyouwantedhim10have.
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假定你是李华.暑假即将来临你希望邀请来自英国的交流生George和你一起在到航空大世界AviationWorld主题公园游玩请你给他写一封邀请邮件要点包括 1.简单介绍主题公园 2.活动或行程安排.
Howtobenaturallyfunny Peoplewhoarenaturallyfunnyinsocialsituationsexperiencemanybenefits.Numerousstudieshaveshownthathumorreducessocialanxietyhelpstoeasetensionandhasanumberofpositiveemotionalandpsychologicaleffects.Inadditionithasbeenshownthatfunnypeoplemaybemoresuccessful.Howeveritisimportantthatbeingfunnycomesacrossnaturallyinalaid﹣backandspontaneous即兴的fashion.1 1.Startbylooseningup! 2Rememberthatlaughteriscontagious可传染的soifyoucarryyourselfinanopenandhumorouswaypeoplewillbereadytolaugh.Tobreaktheiceyoumayfollowtheleadofothersifyouneedto. 2.Lookforhumorineverydayevents. Manycomediansfocusontheworldaroundthemtofindcomedicmaterial.3Trymakingagoalofnoticing5funnythingsperdaythathappentoyou.Throughthistechniqueyouwillbegintoseehumorinmundanesituationsthateveryonewillappreciate. 3.4 Weallhavefriendswhoarealwaysgoodforalaugh.Whatisitthatmakesthemfunny?Whenyouseethempaycarefulattentiontowhatmakesthemfunny.Isittheirtoneofvoicebodylanguagecontentgeneraldemeanororsomethingelsethatmakesthemnaturallyfunny.Identifyingwhatisthatmakesthemfunnywillprovidecluesforhowyoucanbenaturallyfunnyaswell. 4.Practicebeingfunny. Makeityourgoaltosayordosomethingthatmakessomeonelaughonceaday.5Thereforeprofessionalcomediansoftenspendyearsdevelopingtheiruniquestyle.Bystartingsmallyouwillbeonyourwaytobeingnaturallyfunnyingeneralconversation. A.Agoodsenseofhumordoesnotappearovernight. B.Visitwithanaturallyfunnyfriendoracquaintance. C.Ifyoufindsomethingfunnyshareitwithafriendwhoyouthinkwillfindthisfunnyaswell. D.Havinghumorcomeacrossasforcedandawkwardcanhaveanegativeimpactuponsocialsituations. E.Otherslooktotheirpastexperiencessuchastheirchildhoodorpastrelationshipsasawaytomakepeoplelaugh. F.Whileotherswillnotalwaysunderstandyourhumoryoucanusetheirreactionstohelpimproveyourstylecontentandtiming. G.Beingtoouptightandself﹣consciousareroadblockstodevelopingandcommunicatinganaturalsenseofhumorthatisrelatabletootherpeople.
I认出了himassoonashecameintotheroom.
Iwasasingleparentoffoursmallchildrenworkingatalow﹣paidjob.Moneywasalways1butwehadaroofoverourheadsfoodonthetable2onourbacks.ItwasChristmastime.We3downtowntoseetheChristmaslightsandenjoyedaspecialdinner4thebigexcitementforthekidswasthefunofChristmas5atthemall购物中心.Theytalkedandplannedforweeksaheadoftime6eachotherwhattheywantedforChristmas. Thebigdayarrived.I7eachofthefourkidsatwenty﹣dollarbillandaskedthemto8forgifts.Theneveryonescattered散开. Backinthecardrivinghomeeveryonewas9aboutChristmaslaughingandaskingeachotheraboutwhattheyhad10.InoticedGingermyyoungerdaughterhadonlyonesmallandflatbagwithher.Icould11enoughthroughtheplastic12totellthatshehadboughtcandybars﹣﹣﹣fifty﹣centcandybars!Whatdidshe13withthattwenty﹣dollarbillIhadgivenher?Iwasso14.AftergettinghomeIcalledherintomybedroomandclosedthedoor.Thiswaswhatshetoldme Iwaslookingaround15ofwhattobuyandI16toreadthelittlecardsononeoftheSalvationArmy'sGivingTrees.Oneofthecardswas17alittlegirlfouryearsoldandallshe18forChristmaswasadollwithclothesandahairbrush.SoItookthecardoffthe19andboughtthedollforher.Wehavesomuchandshedoesn'thaveanything. Myanger20andIhadneverfeltsorichasIdidthatday. 1A.powerful B.tight C.valuable D.available 2A.books B.babies C.bags D.clothes 3A.drove B.ran C.rode D.walked 4A.since B.and C.but D.because 5A.working B.shopping C.eating D.playing 6A.reading B.studying C.helping D.asking 7A.gave B.sent C.passed D.dropped 8A.wait B.beg C.search D.apply 9A.curious B.excited C.careful D.nervous 10A.served B.found C.received D.bought 11A.see B.take C.get D.judge 12A.hairbrush B.card C.bag D.bar 13A.play B.do C.gain D.begin 14A.worried B.satisfied C.happy D.angry 15A.thinking B.reminding C.dreaming D.hearing 16A.regretted B.stopped C.hesitated D.returned 17A.on B.along C.for D.with 18A.wanted B.prepared C.sold D.saved 19A.roof B.window C.tree D.doll 20A.increased B.continue C.lost D.disappeared
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StudentsinmanycountriesarelearningEnglish.Someofthesestudentsaresmallchildren.Othersareteen﹣agers.Manyareadults.Somelearnatschoolothersbythemselves.AfewlearnEnglishbylearningthelanguageovertheradioonTVorinfilm.Onemustworkhardtolearnanotherlanguage. WhydoallthesepeoplewanttolearnEnglish?Itisdifficulttoanswerthisquestion.ManyboysandgirlslearnEnglishatschoolbecauseitisoneoftheirsubjectsrequiredforstudy.TheystudytheirownlanguageandmathsandEnglishSomepeoplelearnitbecauseitisusefulfortheirwork.ManypeoplelearnEnglishfortheirwork.ManypeoplelearnEnglishfortheirhigherstudiesbecauseatcollegeoruniversitysomeoftheirbooksareinEnglish.OtherpeoplelearnEnglishbecausetheywanttoreadnewspapersormagazinesinEnglish. 1PeoplelearnEnglish. A.atschool B.overtheradio C.onTV D.notallinthesameway 2DifferentkindsofpeoplewanttolearnEnglish. A.togetherwithothersubjects B.fordifferentreasons C.fortheirwork D.forhigherstudiesatcolleges 3Fromthispassageweknowthat. A.wecanlearnEnglisheasily B.Englishisverydifficulttolearn C.Englishislearnedbymostpeopleintheworld D.Englishisausefullanguagebutonemustworkhardtolearn 4Whichofthefollowingisright? A.Wedon'tneedtolearnanyforeignlanguages. B.WecandowellinallourworkwithoutEnglish. C.Englishisthemostimportantsubjectinschools. D.WeshouldlearnEnglishbecauseweneedtofacetheworld.
Takinggoodnotesisatime﹣savingskillthatwillhelpyoutobecomeabetterstudentinseveralways.1.Secondyournotesareexcellentmaterialstorefertowhenyouarestudyingforatest.Thirdnote﹣takingoffersvarietytoyourstudytimeandhelpsyoutoholdyourinterest. Youwillwanttotakenotesduringclassroomdiscussionsandwhilereadingatextbookordoingresearchforareport.2.Wheneverorhoweveryoutakenoteskeepinmindthatnote﹣takingisaselectiveprocess.3.Thefollowingmethodsmayworkbestforyou. ●Readthetextquicklytofindthemainfactsandideasinit. ●Carefullyreadthetextandwatchforwordsthatcanshowmainpointsandsupportingfacts. ●Writeyournotesinyourownwords. ●4 ●Noteanyquestionsorideasyoumayhaveaboutwhatwassaidorwritten. Asyoutakenotesyoumaywanttouseyourownshorthand速记.Whenyoudobesurethatyouunderstandyoursymbolsandthatyouusethemallthetime.5 A.Usewordsnotcompletesentences. B.Therearethreepracticalnote﹣takingmethods. C.Youmustwriteyournotesonseparatepaper. D.Otherwiseyoumaynotbeabletoreadyournoteslater. E.youwillalsowanttodevelopyourownmethodfortakingnotes. F.Thatmeansyoumustfirstdecidewhatisimportantenoughtoincludeinyournotes. G.Firstthesimpleactofwritingsomethingdownmakesiteasierforyoutounderstandandrememberit.
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OceanParkAcademyHongKongOPAHK1provideenvironmentaleducationalprograms2blendinto融入theschoolcurriculum.Theseprogramsofferdiverselearningopportunitiesandencouragestudentstoappreciateandbondwithnature.Theyinclude3experientiallearningapproachwithstudentsmakingdiscoveriesandreceivinginspirationthrough4theyownobservations. Inour5lateprogramsthelearningprocessisevenmoreinteractiveandstudentslearnthrough6explore.Therearemoreopportunitiesforactiveparticipationandmoretimeforreflectionand7share.Students'insightscanthenbeintegratedintotheirdailylives.ASTEAMelementisprogressivelyintroduced8ourschoolprogramstomotivatethestudents9thinkandtofacilitateself﹣learning.OPAHKalsofeaturesaTeacherDayCamptoinspireandassistteacherswithimplementingenvironmentaleducation.10in﹣parkactivitiesOPAHKalsoorganizesoutreachseminars推广研讨会andproject﹣basedlearningprogramsinschools.
NothingwasgoingrightforDr.Turneratthehospital.Hemadeamistakewhileoperatingonapatient.Hefeltsurehewasnolongertrustedanddecidedtochangehisjob.Onedayhelearnedfromthepaperthatadoctorwaslookingforapartner合作者.ThedoctorwhosenamewasJohnsonlivedinThorbyasmalltowninthenorthofEngland. AfewdayslaterDr.TurnerwenttoThorbyandarrivedatDr.Johnson'shomeearlyintheafternoon.ThougholdandalittledeafDr.Johnsonstillhadagoodbrain.Hekepttalkingtothevisitoraboutthetownanditspeople.Whentheyturnedtothequestionofpartnershipitwasalreadysevenintheevening.Dr.JohnsoninvitedDr.TurnertohavedinnerwithhiminarestaurantbeforecatchingthetrainbacktoLondon.Dr.TurnernoticedthatDr.Johnsonwasfondofgoodfoodandexpensivewines.Theyhadanexcellentmeal.WhenthebillwasbroughtDr.Johnsonfeltinhispocket.Ohdearhesaid.I'veforgottenmymoney.That'sallrightDr.Turnersaid.I'llpaythebill.AshedidsohebegantowonderwhetherDr.Johnsonwasworthyoftrust. 1Dr.Turnerdecidedtoleavehispresentjobbecause. A.hehadneverbeentrusted B.itdemandedtoogreatskills C.hebelieveditofferedlittlehopeforhisfuture D.hethoughtthehospitalwouldlikehimtoleave 2Thetwodoctorsspentmostoftheafternoontalkingabout. A.thingsofnointeresttoDr.Johnson B.thingsofnoimportancetoDr.Turner C.healthmatters D.foodanddrink 3Thestorysuggeststhat. A.Dr.JohnsondidnotlikeDr.Turner B.thetwodoctorswouldbecomefriends C.thetwodoctorswouldnotworktogether D.Dr.Turnerdecidedtostayathispresentjob 4Thewordsdidsointhelastsentencemean. A.caughtthetrainbacktoLondon B.feltinhispocket C.paidthebill D.saidthosewords
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