首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
已知椭圆上的点P到左右两焦点F1，F2的距离之和为，离心率为．（Ⅰ）求椭圆的方程；（Ⅱ）过右焦点F2的直线l交椭圆于A、B两点，若y轴上一点满足|MA|＝|MB|，求直线l的斜率k的值．
查看本题答案
包含此试题的试卷
高二下学期数学《》真题及答案
点击查看
你可能感兴趣的试题
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
已知椭圆的离心率为椭圆C.上任意一点到椭圆两个焦点的距离之和为61求椭圆C.的方程2设直线与椭圆C.
已知椭圆G.的中心在坐标原点长轴在x轴上离心率为且椭圆G.上一点到其两个焦点的距离之和为12则椭圆G
已知椭圆F1F2是左右焦点l是右准线若椭圆上存在点P使|PF1|是P到直线l的距离的2倍则椭圆离心率
求适合下列条件的椭圆的标准方程1椭圆上一点P.32到两焦点的距离之和为82椭圆两焦点间的距离为16且
椭圆与双曲线的焦点相同且椭圆上一点到两焦点的距离之和为则椭圆的离心率为___________.
若椭圆+=1a>b>0上任意一点P到两焦点的距离之和为6且椭圆的离心率为则椭圆方程为.
已知F.1F.2是双曲线C.:a>0b>0的左右两个焦点P.是C.上一点若│PF1│+│PF2│=6
已知椭圆G的中心在坐标原点长轴在x轴上离心率为且G上一点到G的两个焦点的距离之和为12则椭圆G的方
已知椭圆G.的中心在坐标原点长轴在x轴上离心率为且G.上一点到G.的两个焦点的距离之和为12则椭圆G
已知F1F2是椭圆C.的左右焦点点P.在椭圆上且满足PF1＝2PF2∠PF1F2＝30°则椭圆的离心
已知椭圆中心在原点焦点在x轴上长轴长等于12离心率为.1求椭圆的标准方程2过椭圆左顶点作直线l若动点
已知F.1F.2是椭圆的两个焦点P.为椭圆上一点∠F.1PF2＝60°.1求椭圆离心率的范围2求证△
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
已知F1F2是椭圆 的两焦点经过F2的直线交椭圆于点AB若|AB|=5则|AF1|+|BF1|等于
11
10
9
16
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
已知椭圆C的中心在坐标原点O长轴在x轴上离心率为且椭圆C上一点到两个焦点的距离之和为4.Ⅰ椭圆C的标
已知焦点在轴上中心在的椭圆上一点到两焦点的距离之和为6若该椭圆的离心率为则椭圆的方程是
已知椭圆的离心率为椭圆C.上任意一点到椭圆两个焦点的距离之和为61求椭圆C.的方程2设直线与椭圆C.
已知椭圆G.的中心在坐标原点焦点在x轴上离心率为且椭圆G.上一点到椭圆G.的两个焦点的距离之和为12
热门试题
更多
8分Studentsshouldbeabletoshowwhattheyknow.Manyfolkstakethisasanapparenttruth.ButIthinkitdemandscloserexamination. Possessingaskillorpieceofknowledgeisnotthesamethingasbeingabletoshowit.Thisiswhymanysmartyoungpeoplehateschool.Understandingfiguringoutandgettingahandleonapieceofknowledgeisreallyexcitingbuthavingtoprovetosomebodyelsethatyouunderstandisapainintheneck. Findingproofofstudentlearningisahugepartoftheteacher'sjobandwhetheritisdonepoorlyornotmakesallthedifferenceinthatteacher'seffectiveness.ThereisahugedifferencebetweenhowdoIfigureoutifthisstudentunderstandsandhowdoImakethisstudentprovetomehegetsit.Thefirstisavaluableapproachthesecondisthefirststepontheroadtowardwastingeverybody'stime. Andthere'stheproblem.Ifwestartwiththeassumptionthatastudentwhoknowsmustbeabletoshowhisknowledgetooursatisfactionwewillbetravelingdownthewrongroad.Themorewedemandthatstudentsprovetousthattheyknowthestuffthemorewewilldesignartificialtasksthatdemandasetofskillsandknowledgeentirelydifferentfromthosewereallywanttomeasure. AsaclassroomteacherIhavetorememberthattheburden重担isonmetofindawaytoseewhatmystudentsknowtheburdenisnotonthemtoputonwhatevertrainedmonkeyshow. ItmaynotbetheworstthingevertosayStudentsshouldbeabletoshowwhattheyknow.ButIthinkit'sfarmoreusefultosayTeachersshouldbeabletodiscoverwhatstudentsknow. 1Whatdoestheunderlinedphraseinthesecondparagraphmean? A.Verydangerous. B.Veryannoying. C.Verysurprising. D.Veryfrequent. 2Accordingtothethirdparagraphateachershouldhavetheabilityto. A.discoverwhetherhisstudentshaveunderstood B.avoidwastingtheprecioustimeinclass C.applyvariousapproacheswhileteaching D.givestudentsthechancetoprovethemselves 3Whatdoestheauthorthinkoftheartificialtasksdesignedtoteststudentlearning? A.Theyshouldbelimitedinnumber. B.Theyareahugeburdenonteachers. C.Theyshouldmainlyfocusoneffectiveness. D.Theyslideawayfromtheoriginalpurpose. 4Whatisthemainideaofthepassage? A.Studentsshouldbeabletoshowwhattheyknow. B.Therearemanywaystofindproofofstudentlearning. C.Teachersshouldbeabletodiscoverwhatstudentsknow. D.Thereshouldbebetterunderstandingbetweenteachersandstudents.
以下有关近代物理的内容叙述正确的是
如图所示倾角为30°的粗糙斜面与倾角为60°的足够长的光滑斜面对接在一起两斜面上分别放有质量均为m的物块甲和乙两物块通过一跨过定滑轮的细线连在一起．在平行于斜面的拉力F的作用下两物块做匀速运动．从图示位置开始计时在甲物块与滑轮相碰前的一段时间内下面的图象中x表示每个物块所通过的路程E表示两物块组成的系统的机械能EP表示两物块组成的系统的重力势能Wf表示甲物块克服摩擦力所做的功WF表示拉力F对乙物块所做的功则图象中所反映的关系可能正确的是
已知点A12B31C22D1m 1若向量∥求实数m的值 2若m＝3求向量与的夹角
30分TwoyearsagoIdonatedmykidney肾tomybrother.Iconsidereditacompletelifechangingexperiencenotonlyforthetwoofus1fortheentirefamily.Weendedup2fromsurgery外科手术atafriend'shomeinBatonRougeLA.His3touswasunforgettable.Wehadreceivedsomany4.Wehadgottenfooddonationfromsomanypeoplewho5ussomethingbeyondphysicalcomfort.Nowmybrotherisbackonhisfeetandislivinglife6normal.LastAprilhe7togivebacktothecommunity社区by8moneyfortheMedicalAssociationthroughcycling180milesfromHoustontoAustin.Ifeltgreatlymovedtearsineyes9thatmykidneygavehimasecondchanceinlifeandthatheisnowlivingbeyondwhatheimagined10tobe.Recentlyourmothersufferedfrombreastcancer.11shewastheonewhotookcareofmeandmybrotherwewantedtodosomethinginher12.MybrothermysisterandIaregoingto13nextyearfortheCancerSociety14mybrotherandIwillbejoininginthehalfmarathoninhonourofourmotherandthiswillbeourgoodchancetobekidneydonation15aswell.We16duringoursurgerythatseveralthousandpeoplediefromkidneydiseaseeveryyear.Patientswouldbeonthe17listforkidneydonationandmanyofthemendupindeathbecauseofthe18ofkidneydonors.IfmybrotherandIcan19otherstodothesamethingIdidmaybemoreliveswillbesaved.20onlyIhadmorekidneysIwoulddoitagainforotherpeople.1A.and B.but C.so D.or2A.rebuilding B.reusing C.recovering D.reserving3A.kindness B.courage C.power D.manners4A.friends B.people C.patients D.doctors5A.devoted B.contributed C.delivered D.gave6A.against B.under C.beyond D.for7A.decided B.urged C.demanded D.insisted8A.earning B.lending C.donating D.raising9A.knowing B.expecting C.hoping D.reporting10A.future B.life C.success D.luck11A.If B.Though C.Because D.Before12A.place B.job C.health D.honour13A.run B.study C.cheer D.fight14A.as B.when C.while D.however15A.sellers B.collectors C.volunteers D.advocates16A.figuredout B.foundout C.learnedfrom D.lookedinto17A.working B.waiting C.sending D.growing18A.delay B.common C.lack D.help19A.encourage B.support C.order D.affect20A.But B.Not C.Just D.If
8分Thefirstlighthouses灯塔inAmericawhichwerebuiltinthe1710susedwoodorcoalasfuel.Bythemid﹣1700﹩Americanlighthousesbegantouseoil﹣burninglamps.Thelampswerelitandthenplacedinahighplacesotheycouldbeseenfromgreatdistances. Thetroublewithusingoillampswasthatonlyasmallpercentageofthelightproducedbythelampcouldbeseenfromthesea.Increasingtheamountoflightmeantburningmorefuelwhichrequiredbringingmoreoiltothelighthouse.Thiswasadifficultjobforthelighthousekeeper. Manyinventorstrieddifferentwaystoincreasethebrightnessofthelightfromoillamps.Bytheearly1800sAmericanlighthousesusedArgandlamps.Aircomingfromthebaseofthislampmadethelightbrighter.WiththeadditionofareflectortheArgandlampbecamestandardinAmericanlighthousesuntilthe1850s.Shipsfifteenmilesawaycouldseethelightonaclearnight. In1819theFrenchgovernmentaskedscientistAugustin﹣JeanFresneltoworkondirectingmorelighttowardships.Fresnelwhostudiedprisms棱镜beganworkingonaspeciallens透镜thatusedmanyprisms.Fresnelwasabletosend80percentofthelightsoshipscouldseethelightfromtwentymilesaway!ThenewlenswasnamedtheFresnellens.Americabegantousethenewlensinthe1850s. Overtheyearssourcesoflightcontinuedtochange.Bythe1870slighthousesbegantousekerosenefuelandin1886electricitywasfirstused.Bythe1990smanylighthousesstartedtousesolarpower.Electricityisstillusedinlighthousestodaybutitisusuallyproducedbysolarpower. 1Whatwasadisadvantageoftheoil﹣burninglamp? A.Itmightresultinfire. B.Itwasnotbrightenough. C.Itdidnotworkwellinbadweather. D.Itmightcauseharmtolighthousekeepers. 2Whatlampdoesthefollowingpictureshow? A.Alampusedinthemid﹣1700s. B.AlampwiththeFresnellens. C.Amodernoillamp. D.AnArgandlamp. 3WhatdoweknowabouttheFresnellens? A.ItwasfirstusedinAmerica. B.Itwasabletosendallthelight. C.Itwasnamedafteraprismexpert. D.Itwasanunsuccessfulinvention. 4Whatisthetextmainlyabout? A.ThetechnologyinAmericanlighthouses. B.Theimportantroleoflighthouses. C.FamouslighthousesinAmerica. D.Somegreatinventionsoflight.
化学与社会生产生活和科技密切相关下列有关说法正确的是
6分TheopeningtimesofVienna'smuseumsshopsTouristInfoViennaetc TouristInfo 1stdistrictcitycentre AlbertinaplatzcornerofMaysedergasse Dailyfrom900amto700pm ViennaInternationalAirportArrivalHall Dailyfrom700amto1100pm Museums MostofVienna'smuseumsareopendaily.SomeareclosedonceaweekofteneitheronMondayorTuesday.Thedailyopeningtimesvaryfrommuseumtomuseumbutyoucangenerallyassumethatamuseumwillbeopenbetween1000amand500pm.Someofthelargemuseumsofferartloversonelateeveningperweekandstayopenuntil800pmor900pm. Shops InViennashopsareusuallyopenfromMondaytoFridayfrom900amto630pmandonSaturdayuntil500pmor600pm.Someshoppingcentersareopenuntil800pmor900pmfromMondaytoFriday. Banks MostbanksinViennaareopenfromMondaytoFridayfrom800amto1230pmandfrom130pmto300pmanduntil530pmonThursdays.Inthecitycenteralmostallbanksareopenoverlunchtime. Restaurantsandhotfood Mostrestaurantsinthecitycenterareopendaily.Hotfoodisgenerallyofferedfrom1100amto200pmandfrom600pmto1000pm.SomerestaurantsoftenoutsidethecitycenterareclosedononedayeachweeksometimesonSundaysaswell. 1AccordingtothepassagewhencanartloversvisitsomemuseumsinVienna? A.At600pm B.At900am C.At800am D.At1000pm 2Youcandothefollowingat400pmonThursdaysEXCEPT. A.goshopping B.visitthemuseum C.eatahotmealinarestaurant D.drawsomemoneyatthebank 3Thetextisprobablywrittenfor. A.socialorganizations B.governmentofficials C.thelocals D.tourists
如图所示实线是一列简谐横波在t1时刻的波形图M是平衡位置距O点5m的质点虚线是t2＝t1+0.2s时刻的波形图．下列说法中正确的是
在做“练习使用多用电表”实验时某同学想测量多用电表内电源的电动势表盘上方正中刻度值为15他找到两块规格完全相同的多用电表和一个定值电阻设计实验方案如下 1首先将多用电表甲调到欧姆档“x1”倍率并进行欧姆调零测量出定值电阻阻值为10.0Ω 2保持多用电表甲档位不变将多用电表乙选择旋钮置于直流100mA档并与定值电阻串联如图甲所示则多用电表甲的红表笔应接填“a”或“b”接线柱黑表笔接另一接线柱 3该学习小组正确连接电路后观察用甲乙两表示数分别如图乙丙所示则乙表直流100mA挡的内阻为Ω多用电表内电源电动势E＝V．结果均保留两位有效数字
10分假如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作文.文中共有10处语言错误每句中最多有两处每处错误仅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∧并在其下面写出该加的词. 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限一词. 2只允许修改10处多者从第11处起不计分. Johnwentshoppinginastoreandheforgottobringabag.Sohebuysashoppingbag.Afterarrivinghomeitoccurredhimthathecouldmakeabagbyusinghisoldtrousers.Severalhoursearlierhemadehimselfaverynicebag.Hismotherwasamazingatwhathehaddone.Avoidingspendingmoneyunnecessarilyisawayofsaving.Andmakingagooduseofthingsisanapproachtoprotecttheenvironment.What'smoreitishelpfulforyoutoimprovetheabilitytomakethingsbyhands.Itnotonlybringsuspleasurebutreducewastearoundus.
已知集A＝{x|x＜2}集合B＝{x||x|＜2}则A∩B＝
在四面体A﹣BCD中AB＝AC＝DB＝DC＝BC且四面体A﹣BCD的最大体积为则四面体A一BCD外接球的表面积为．
氢卤酸的能量关系如图所示下列说法正确的是
执行如图所示的程序框图若输人的n值为2019则S＝
如图所示边长为l质量为m的等边三角形导线框用绝缘细线悬挂于天花板导线框中通一逆时针方向的电流．图中虚线过ab边中点和ac边中点．在虚线的下方有一垂直于导线框向里的匀强磁场．其磁感应强度大小为B此时导线框处于静止状态细线中的拉力为F1保持其他条件不变现将虚线下方的磁场移至虚线上方此时细线中拉力为F2．导线框中的电流大小为
8分TraditionallyrobotshavebeenhardmadeofmetalandotherrigidmaterialButateamofscientistsatHarvardUniversityintheUShasmanagedtobuildanentirelysoftrobot﹣onethatdrawsinspirationfromanoctopus章鱼. DescribedinsciencejournalNaturetheOctobotcouldpavethewayformoreeffectiveautonomousrobotsthatcouldbeusedinsearchrescueandexploration.TheOctobotisminimalsystemwhichmayserveasafoundationforanewgenerationofcompletelysoftautonomousrobotsthestudy'sauthorswrote. Robotsbuiltforpreciserepetitivemovementsinacontrolledenvironmentdon'tdosowellonroughterrains地形orinunpredictableconditions.Andtheyaren'tespeciallysafearoundhumansbecausethey'remadeoutofhardandheavypartsthatcouldbepotentiallydangeroustotheirusers. Soresearchershavebeenworkingonbuildingsoftrobotsfordecades.They'retakeninspirationfromnaturelookingtoanimalsfromjellyfishtocockroacheswhichareoftenmadeupofmoreflexiblematter. Butcreatingacompletelysoftrobotremainsachallenge.Evenifengineersbuildasilicone硅酮bodyit'sstillagrandchallengetoconstructflexibleversionsofessentialpartssuchasasourceofpower. Althoughsoftroboticsisstillinitsearlystageitholdsgreatpromiseforseveralapplicationssuchassearch﹣rescueoperationsandexplorationBarbaraMazzolaiandVirgilioMattolioftheItalianInstituteofTechnology'CenterforMicro﹣BioRoboticswroteinacomment.Softrobotsmightalsoopenupnewapproachestoimprovingwellnessandqualityoflife. 1What'sthespecialfeatureofOctobot? A.It'ssoft. B.It'smadeofmetal. C.It'sverysmall. D.Itlookslikeanoctopus. 2What'sthedisadvantageoftraditionalrobots? A.They'rehardtocontrol. B.They'retooheavytomove. C.Theycan'tpredictconditions. D.Theycan'tbehavewellallthetime. 3OneofthebiggestchallengesistobuildOctobot's. A.siliconebody B.complexcomponents C.precisemovements D.flexiblepowersource 4WhatcanweinferabouttheapplicationofOctobot? A.Ithasbeenusedinvariousfields B.Ithasnotbeenputintouseonalargescale. C.Ithasbeenusedinthefieldofrescue D.Ithasnotbeenimprovedyet.
如图所示ABC和ABD为两条光滑固定轨道ABE在同一水平面上CDE在同一竖线上D点距水平面的高度为h1＝3.2mC点距水平面的高度为h2＝5m一滑块从水平面上的A点以相同初速度分别沿两轨道滑行到C点或D点后水平抛出．取重力加速度g大小为10m/s2．求 1若从C点抛出时的水平射程与从D点抛出时相等滑块在A点的初速度大小 2若滑块在A点的初速度大小为10m/s调整轨道及C点的高度要求从C点抛出时水平射程最大则C点离地高度应为多少．
如图是一圆锥的三视图正视图和侧视图都是顶角为120°的等腰三角形若过该圆锥顶点S的截面三角形面积的最大值为2则该圆锥的侧面积为
已知圆C的半径为2在圆内随机取一点P并以P为中点作弦AB则弦长|AB|≤2的概率为
如图在矩形ABCD中AB＝3BC＝2点MN分别是边ABCD上的点且MN∥BC＝2．若将矩形ABCD沿MN折起使其形成60°的二面角如图 1求证平面CND⊥平面AMND． 2求直线MC与平面AMND所成角的正弦值．
25分假定你是某国际学校的学生李华你校学生会准备举行一次读书月活动.请你根据下面的提示用英语写一则书面通知并号召大家积极参与. 1活动目的丰富校园生活开阔学生视野提高学生阅读水平 2活动内容每人至少读三本书内容不限并写一篇读后感impressionsofafter﹣reading于四月三十日前交给学生会 3活动时间三月六日至四月五日. 注意 1词数100左右 2可以适当增加细节以使行文连贯. Dearfellowstudents.
15分Carpoolingiswhenadriverofferstotakepassengersinexchangeforsomemoneyforpetrol.As1rsultcarpoolingcanbe2cheaphanpublictransportbecauseeverynoeinthecarsharesthecostofpetrol.I3recentdidcarpoolingforthefirsttimeanditwasveryeasytofindadriver.Iusedawebsite4listsdrivers'profiles简介andfoundsomeonewhowasgoingtothesameplaceasme.Alotofinformationcan5seeintheprofilessuchastheirfirstnameageandgender性别aswellasreviewsfromotherpassengers.Idecided6travelwithaladywhohadverygoodreviews. Ifoundcarpoolingtobean7impressexperience.Notonlywasthetripverycheapbutthedriverandtheotherpassengerswerereallyfriendly.TheywereallFrenchsoIhadthechancetopractise8speaksomeFrench.WhenIwavedgoodbyetothemathoughtsuddenlyoccurredtome9carpoolingcouldbethefutureoftravel.Bothdriversandpassengerscanbenefit10thisformoftravel.Itsavesmoneyandperhapsmoreimportantlycarpoolingprovidesafantasticopportunitytomeetinterestingpeopleonyourtravels.
在平面直角坐标系xoy中已知圆C1x+32+y﹣12＝4和圆C2x﹣42+y﹣52＝4 1若直线l过点A40且被圆C1截得的弦长为2求直线l的方程 2设P为平面上的点满足存在过点P的无穷多对互相垂直的直线l1和l2它们分别与圆C1和C2相交且直线l1被圆C1截得的弦长与直线l2被圆C2截得的弦长相等求所有满足条件的点P的坐标．
若sinα+＝则cos﹣α＝．
10分Youcan'thelpspendingmuchmoneyduringthefestivalseason.Howeverit'snotimpossibletosave.Herearesometipsyoucantaketopreventyourselffromoverspending. Surroundyourselfwithpeoplewhomakeyoufeelgood.There'sacommontrickplayedbytheadvertisingindustry1theadvertisingindustrytriestheirbesttoappealtoyouremotionsinordertomotivateyoutobuytheirproducts.Soinsteadoffallingintotheirmarketingtrapsurroundyourselfwiththepeopleyouloveandmakeyourselffeelgood. Don'tbuyanythinghot﹣heatedly.EverheardofthesayingAfoolandhismoneyaresoonparted?2. Considerrenting3.Afterallhowoftenwillyoubewearingthatnormaldress4.Whenitcomestoclothesyoushouldoftenpickouttheunused.SellingthemoneBayorCarousellcangiveyouextracashtogoshoppingwith. Remindyourselfofthethingsyouhave.Youmaynotknowaboutyourself.Everytimeyoulookatyourcloset壁橱andorganizeityoufindjusthowmanyitemsofclothingyouhave5. A.Sellitemsyoudon'tneed B.Ifyouareinabadmood C.Putawaytheclothesyoudon'twear D.Whenyouareattractedtobuycertainproducts E.Thispreventsyoufromwantingtogoshoppingevenmore F.Itwarnsyounottobeamanwhodoesn'tthinktwiceaboutpartingwithhismoney G.Rentingadressorabagforaspecialoccasioncouldactuallysaveyoumoremoney
已知两条直线ab与两个平而αβ给出下列命题 ①若a⊂α．b⊂β．α∥β则a∥b②若a⊂αb⊂βa∥βb∥α则α∥β ③若a⊥αb⊥βα∥β则a∥b④若α⊥βa∥αb∥β则a∥b 其中正确的命题个数为
在△ABC中点D在边BC上若则＝
如图1所示斜面体放在粗糙的水平地面上两斜面光滑且倾角分别为53°和37°两小滑块P和Q用绕过滑轮不可伸长的轻绳连接分别置于两个斜面上OP∥ABOQ∥AC已知PQ和斜面体均静止不动．若交换两滑块位置如图2所示再由静止释放斜面体仍然静止不动P的质量为m取sin53°＝0.8cos53°＝0.6重力加速度大小为g不计滑轮的质量和摩擦则下列判断正确的是
一定质量的理想气体从状态A依次经过状态BC和D后又回到状态A．其中C→D→A为等温过程．该循环过程如图所示下列说法正确的是
热门题库
更多
高二上学期英语
高二上学期生物
高二下学期数学
高二上学期化学
高二下学期物理
高三下学期物理
高三上学期物理
高三上学期生物
高三上学期化学
高二下学期化学
高二下学期生物
高三下学期生物
高三下学期化学
高三上学期英语
高二下学期英语
教案备课库
湘公网安备 43130202000226号