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已知F1,F2分别为椭圆的左右焦点,上顶点为M,且△F1MF2的周长为,且长轴长为4. (1)求椭圆C的方程; (2)已知P(0,3),若直线y=2x﹣2与椭圆C交于A,B两点,求.
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高二下学期数学《》真题及答案
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设椭圆的左右焦点分别为F1F2右顶点为A上定点为B已知 设P为椭圆上异于其顶点的一点以线段
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.
异步电动机在负载运行时定转子频率 分别为F1.F2转差率s则F1与F2的关系为
F1=F2;
F2=sF1。
F1=sF2
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
已知椭圆x2+=10
已知椭圆C.:+=1a>b>0的上顶点为A.左右焦点分别为F.1F2且椭圆C.过点P以AP为直径的圆
在平面直角坐标系xOy中已知椭圆E.的左右焦点分别为F.1F.2上下顶点分别为M.N.若椭圆的离心率
已知点是中心在原点长轴在x轴上的椭圆的一个顶点离心率为椭圆的左右焦点分别为F.1和F.21求椭圆方程
已知椭圆的左右焦点分别为F.1F.2点P.为椭圆上一点且∠PF1F.2=30°∠PF2F.1=60°
已知椭圆C.+=1a>b>0的左右焦点分别为F.1F.2离心率为过F.1的直线交椭圆于E.F.两点且
如图已知F1为椭圆的左焦点A.B.分别为椭圆的右顶点和上顶点P.为椭圆上的点.若PF1⊥F1APO∥
已知椭圆C.的中心在原点焦点在x轴上左右焦点分别为F.1F.2且|F1F.2|=2点1在椭圆C.上.
如图设椭圆+=1的左右焦点分别为F1F2过焦点F1的直线交椭圆于Ax1y1Bx2y2两点若△ABF2
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
设椭圆的轨迹方程为 焦点分别为F1-10F210直线l:x=a2交x轴于点A且
已知椭圆的左右焦点分别为F1F2上顶点为A.点在椭圆C.上过点A.与AF2垂直的直线交x轴负半轴于点
运动员用双手握住竖直的滑杆匀速上攀和匀速下滑时运动员所受到的摩擦力分别是f1和f2那么.【2】
)f1向下,f2向上,且f1=f2
(
)f1向下,f2向上,且f1>f2(
)f1向上,f2向上,且f1=f2
(
)f1向上,f2向下,且f1=f2
设椭圆的轨迹方程为 焦点分别为F1-10F210直线l:x=a2交x轴于点A且
已知椭圆C.+=1a>b>0的左右交点分别为F1F2且|F1F2|=4A.﹣是椭圆上一点.1求椭圆C
已知椭圆C.的左右焦点分别为P.为椭圆C.上任一点M=M.的最大值为.
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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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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.
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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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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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