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设F1，F2分别是椭圆的左、右焦点，过F1斜率为1的直线l与E相交于A，B两点，且|AF2|，|AB|，|BF2|成等差数列。 （1）求椭圆E的离心率； （2）设点P（0，-1）满足|PA|=|PB...
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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．
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
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
椭圆的左焦点为F1右焦点为F2点P在椭圆上如果线段PF1的中点在y轴上那么|PF1|是|PF2|的
9倍
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5倍
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设文件F1的当前引用计数值为1先建立F1的符号链接软链接文件F2再建立F1的硬链接文件F3然后删除F
0、1
1、1
1、2
2、1
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
设文件F1的当前引用计数值为1先建立F1的符号链接软链接文件F2再建立F1的硬链接文件F3然后删除F
0、1
1、1
1、2
2、1
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F.1F2分别是椭圆E.:+=1a>b>0的左右焦点过点F.1且斜率为1的直线l与椭圆E.相交于A
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
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
(
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(
)f1向上，f2向下，且f1=f2
设文件F1的当前引用计数值为1先建立F1的符号链接软链接文件F2再建立F1的硬链接文件F3然后删除F
0、1
1、1
1、2
2、1
设文件F1的当前引用计数值为1先建立F1的符号链接软链接文件F2再建立F1的硬链接文件F13然后删除
0、1
1、1
1、2
2、1
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
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athardchangeupbeforewinhappendownchoosepractisecomepartLifeisnoteasysoI’dliketosayWhenanything46believeinyourself!WhenIwasayoungboyIwastooshytospeaktoanyone.Myclassmatesoftenlaughed47me.Iwassadbutcoulddonothing.Latersomethinghappenedandit48mylife.ItwasanEnglishspeechcontest.Mymotheraskedmetotake49init.Whataterribleidea!ItmeantIhadtospeak50alltheteachersandstudentsofmyschool!Comeonboy.Believeinyourself!Youaresureto51ThenmotherandItalkedaboutmanydifferenttopics.AtlastI52thetopicBelieveinyourself.Itriedmybesttorememberallthespeechand53itover100times.Withmymother’sgreatloveIdidwellinthecontest.Icould54believemyearswhenthenewscamethatIhadwonthefirstplace.Iheardthecheersfromtheteachersandstudents.Thoseclassmateswhooncelooked55onmeallsaidcongratulationstome.
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Livinginaforeignculturecanbeexcitingbutitcanalsobeconfusing令人迷惑的.AgroupofAmericanswhotaughtEnglishinothercountriesrecentlydiscussedtheirexperiences.Theydecidedthatmiscommunicationswerealwayspossibleevenoversomethingassimpleas"yes"and"no". OnherfirstdayinMicronesiaanislandinthePacificLisathoughtpeopleweren’tpayinganyattentiontoher.Thedaywashot.Shewentintoastoreandasked"Doyouhavecolddrinks"Thewomantheredidn’tsayanything.Lisarepeatedthequestion.Stillthewomansaidnothing.Shelaterlearnedthatthewomanhadansweredher:Shehadraisedhereyebrows眉毛whichinMicronesiameans"yes". JanrememberedanexperienceshehadinBulgariaacountryinEurope.Shewenttoarestaurantthatwasknownforitscabbage.Sheaskedthewaiter"Doyouhavecabbagetoday"Henoddedhishead.Janwaitedbutthecabbagenevercame.Inthatcountryanodmeansno. TomhadasimilarproblemwhenhearrivedinIndia.Afterexplainingsomethinginclassheaskedhisstudentsiftheyunderstood.Theyansweredwithmanydifferentnodsandshakesofthehead.Hethoughtsomepeoplehadnotunderstoodsoheexplainedagain.Whenheaskedagaintheydidthesamething.Hesoonfoundoutthathisstudentsdidunderstand.InIndiapeoplenodandshaketheirheadsindifferentwaysdependingonwheretheycomefrom.Youhavetoknowwhereapersonisfromtounderstandwhethertheymean"yes"or"no". Tommisunderstoodhisclassatfirstbecause.
Aroundtheworldmoreandmorepeoplearetakingpartindangeroussportsandactivities.Ofcoursetherehavealwaysbeenpeoplewhohavelookedforadventures—thosewhohaveclimbedthehighestmountainstraveledintounknownpartsoftheworldorsailedinsmallboatsacrossthegreatestoceans.Nowhowevertherearepeoplewholookforanimmediateexcitementfromariskyactivitywhichmayonlylastafewminutesorevenseconds. Iwouldconsiderbungeejumpingtobeagoodexampleofsuchanactivity.Youjumpfromahighplaceperhapsabridgeorahot-airballoon200metersabovethegroundwithanelasticropetiedtoyourankles.Youfallatupto150kilometersanhouruntiltheropestopsyoufromhittingtheground.Itissaidthatabout2millionpeoplearoundtheworldhavenowtriedbungeejumping.Otheractivitieswhichmostpeoplewouldsayareasriskyasbungeejumpingincludejumpingfromtallbuildinganddivingintotheseafromthetopofhighcliff. WhydopeopletakepartinsuchactivitiesastheseSomepsychologistssuggestthatitisbecauselifeinmodemsocietieshasbecomesafeandboring.Notverylongagodiseasescouldnoteasilybecuredandlifewasacontinuousbattleforsurvival. Nowadaysaccordingtomanypeoplelifeofferslittleexcitement.Theyliveandworkincomparativelysafeconditions;theybuyfoodinshops;andtherearedoctorsandhospitalstolookafterthemiftheybecomeill.Theanswerforsomeofthesepeopleistolookfordangerinactivitiessuchasbungeejumping. Abesttitleforthetextis.
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athardchangeupbeforewinhappendownchoosepractisecomepartLifeisnoteasysoI’dliketosayWhenanything46believeinyourself!WhenIwasayoungboyIwastooshytospeaktoanyone.Myclassmatesoftenlaughed47me.Iwassadbutcoulddonothing.Latersomethinghappenedandit48mylife.ItwasanEnglishspeechcontest.Mymotheraskedmetotake49init.Whataterribleidea!ItmeantIhadtospeak50alltheteachersandstudentsofmyschool!Comeonboy.Believeinyourself!Youaresureto51ThenmotherandItalkedaboutmanydifferenttopics.AtlastI52thetopicBelieveinyourself.Itriedmybesttorememberallthespeechand53itover100times.Withmymother’sgreatloveIdidwellinthecontest.Icould54believemyearswhenthenewscamethatIhadwonthefirstplace.Iheardthecheersfromtheteachersandstudents.Thoseclassmateswhooncelooked55onmeallsaidcongratulationstome.
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athardchangeupbeforewinhappendownchoosepractisecomepartLifeisnoteasysoI’dliketosayWhenanything46believeinyourself!WhenIwasayoungboyIwastooshytospeaktoanyone.Myclassmatesoftenlaughed47me.Iwassadbutcoulddonothing.Latersomethinghappenedandit48mylife.ItwasanEnglishspeechcontest.Mymotheraskedmetotake49init.Whataterribleidea!ItmeantIhadtospeak50alltheteachersandstudentsofmyschool!Comeonboy.Believeinyourself!Youaresureto51ThenmotherandItalkedaboutmanydifferenttopics.AtlastI52thetopicBelieveinyourself.Itriedmybesttorememberallthespeechand53itover100times.Withmymother’sgreatloveIdidwellinthecontest.Icould54believemyearswhenthenewscamethatIhadwonthefirstplace.Iheardthecheersfromtheteachersandstudents.Thoseclassmateswhooncelooked55onmeallsaidcongratulationstome.
athardchangeupbeforewinhappendownchoosepractisecomepartLifeisnoteasysoI’dliketosayWhenanything46believeinyourself!WhenIwasayoungboyIwastooshytospeaktoanyone.Myclassmatesoftenlaughed47me.Iwassadbutcoulddonothing.Latersomethinghappenedandit48mylife.ItwasanEnglishspeechcontest.Mymotheraskedmetotake49init.Whataterribleidea!ItmeantIhadtospeak50alltheteachersandstudentsofmyschool!Comeonboy.Believeinyourself!Youaresureto51ThenmotherandItalkedaboutmanydifferenttopics.AtlastI52thetopicBelieveinyourself.Itriedmybesttorememberallthespeechand53itover100times.Withmymother’sgreatloveIdidwellinthecontest.Icould54believemyearswhenthenewscamethatIhadwonthefirstplace.Iheardthecheersfromtheteachersandstudents.Thoseclassmateswhooncelooked55onmeallsaidcongratulationstome.
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