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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
7倍
5倍
3倍
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
(
)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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Aroundtheworldmoreandmorepeoplearetakingpartindangeroussportsandactivities.Ofcoursetherehavealwaysbeenpeoplewhohavelookedforadventures—thosewhohaveclimbedthehighestmountainstraveledintounknownpartsoftheworldorsailedinsmallboatsacrossthegreatestoceans.Nowhowevertherearepeoplewholookforanimmediateexcitementfromariskyactivitywhichmayonlylastafewminutesorevenseconds. Iwouldconsiderbungeejumpingtobeagoodexampleofsuchanactivity.Youjumpfromahighplaceperhapsabridgeorahot-airballoon200metersabovethegroundwithanelasticropetiedtoyourankles.Youfallatupto150kilometersanhouruntiltheropestopsyoufromhittingtheground.Itissaidthatabout2millionpeoplearoundtheworldhavenowtriedbungeejumping.Otheractivitieswhichmostpeoplewouldsayareasriskyasbungeejumpingincludejumpingfromtallbuildinganddivingintotheseafromthetopofhighcliff. WhydopeopletakepartinsuchactivitiesastheseSomepsychologistssuggestthatitisbecauselifeinmodemsocietieshasbecomesafeandboring.Notverylongagodiseasescouldnoteasilybecuredandlifewasacontinuousbattleforsurvival. Nowadaysaccordingtomanypeoplelifeofferslittleexcitement.Theyliveandworkincomparativelysafeconditions;theybuyfoodinshops;andtherearedoctorsandhospitalstolookafterthemiftheybecomeill.Theanswerforsomeofthesepeopleistolookfordangerinactivitiessuchasbungeejumping. Inbungeejumpingyou.
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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". TheseAmericansteachingEnglishinothercountriesfoundthatthey.
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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". Thepassageismainlyabout.
Aroundtheworldmoreandmorepeoplearetakingpartindangeroussportsandactivities.Ofcoursetherehavealwaysbeenpeoplewhohavelookedforadventures—thosewhohaveclimbedthehighestmountainstraveledintounknownpartsoftheworldorsailedinsmallboatsacrossthegreatestoceans.Nowhowevertherearepeoplewholookforanimmediateexcitementfromariskyactivitywhichmayonlylastafewminutesorevenseconds. Iwouldconsiderbungeejumpingtobeagoodexampleofsuchanactivity.Youjumpfromahighplaceperhapsabridgeorahot-airballoon200metersabovethegroundwithanelasticropetiedtoyourankles.Youfallatupto150kilometersanhouruntiltheropestopsyoufromhittingtheground.Itissaidthatabout2millionpeoplearoundtheworldhavenowtriedbungeejumping.Otheractivitieswhichmostpeoplewouldsayareasriskyasbungeejumpingincludejumpingfromtallbuildinganddivingintotheseafromthetopofhighcliff. WhydopeopletakepartinsuchactivitiesastheseSomepsychologistssuggestthatitisbecauselifeinmodemsocietieshasbecomesafeandboring.Notverylongagodiseasescouldnoteasilybecuredandlifewasacontinuousbattleforsurvival. Nowadaysaccordingtomanypeoplelifeofferslittleexcitement.Theyliveandworkincomparativelysafeconditions;theybuyfoodinshops;andtherearedoctorsandhospitalstolookafterthemiftheybecomeill.Theanswerforsomeofthesepeopleistolookfordangerinactivitiessuchasbungeejumping. Abesttitleforthetextis.
已知0＜a＜1b＞1ab＞1则下列不等式正确的是.
athardchangeupbeforewinhappendownchoosepractisecomepartLifeisnoteasysoI’dliketosayWhenanything46believeinyourself!WhenIwasayoungboyIwastooshytospeaktoanyone.Myclassmatesoftenlaughed47me.Iwassadbutcoulddonothing.Latersomethinghappenedandit48mylife.ItwasanEnglishspeechcontest.Mymotheraskedmetotake49init.Whataterribleidea!ItmeantIhadtospeak50alltheteachersandstudentsofmyschool!Comeonboy.Believeinyourself!Youaresureto51ThenmotherandItalkedaboutmanydifferenttopics.AtlastI52thetopicBelieveinyourself.Itriedmybesttorememberallthespeechand53itover100times.Withmymother’sgreatloveIdidwellinthecontest.Icould54believemyearswhenthenewscamethatIhadwonthefirstplace.Iheardthecheersfromtheteachersandstudents.Thoseclassmateswhooncelooked55onmeallsaidcongratulationstome.
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若实数ab满足a2+ab-b2=1那么a2+b2的最小值是.
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WheneverthesundroppedandtheblueskycameupmyfatherandIusedtoclimbthemountainnearmyhouse.WalkingtogethermyfatherandIusedtohavealotofconversationsthroughwhichIlearnedlessonsfromhisexperiences.Healwaystoldme"Youshouldhavegoalslikeclimbingthemountain."Withoutthemountain-climbingthatwebothenjoyedwecouldn’thaveenoughtimetospendtogetherbecausemyfatherwasverybusy.Ireallygotalotfrommountain-climbing.Itgavemetimetotalkwithmyfatherandtobeindeepthoughtaswellasdevelopmypatience耐力. Onceweclimbedaveryhighmountain.ItwassochallengingformebecauseIwasonlytenyearsold.DuringthefirstfewhoursofclimbingIenjoyedtheflowersandtreesandthebirds’singingbutastimepassedIgotapaininbothofmylegs.Iwantedtoquitclimbing.InfactIhateditatthatmomentbutmyfathersaidtome"Youcanalwaysseeabeautifulskyatthetopofthemountainbutyoucan’tseeitbeforeyoureachthetop.Onlythereatthetopcanyouseeallofthenicethingsjustlikeinlife." AtthattimeIwastooyoungtounderstandhiswords.Butlaterafterthat!gotnewhopeandconfidence信心.Ifoundmyselfstandingatthetopoftheskywhichwasasclearascrystal水晶. Wecaninfer推断fromthelastparagraphthat.
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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.
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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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Aroundtheworldmoreandmorepeoplearetakingpartindangeroussportsandactivities.Ofcoursetherehavealwaysbeenpeoplewhohavelookedforadventures—thosewhohaveclimbedthehighestmountainstraveledintounknownpartsoftheworldorsailedinsmallboatsacrossthegreatestoceans.Nowhowevertherearepeoplewholookforanimmediateexcitementfromariskyactivitywhichmayonlylastafewminutesorevenseconds. Iwouldconsiderbungeejumpingtobeagoodexampleofsuchanactivity.Youjumpfromahighplaceperhapsabridgeorahot-airballoon200metersabovethegroundwithanelasticropetiedtoyourankles.Youfallatupto150kilometersanhouruntiltheropestopsyoufromhittingtheground.Itissaidthatabout2millionpeoplearoundtheworldhavenowtriedbungeejumping.Otheractivitieswhichmostpeoplewouldsayareasriskyasbungeejumpingincludejumpingfromtallbuildinganddivingintotheseafromthetopofhighcliff. WhydopeopletakepartinsuchactivitiesastheseSomepsychologistssuggestthatitisbecauselifeinmodemsocietieshasbecomesafeandboring.Notverylongagodiseasescouldnoteasilybecuredandlifewasacontinuousbattleforsurvival. Nowadaysaccordingtomanypeoplelifeofferslittleexcitement.Theyliveandworkincomparativelysafeconditions;theybuyfoodinshops;andtherearedoctorsandhospitalstolookafterthemiftheybecomeill.Theanswerforsomeofthesepeopleistolookfordangerinactivitiessuchasbungeejumping. Thewriterofthetexthasaattitudetowardsdangeroussports.
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.
Myparentstaughtmenottowastefood.Mymomalwaysfoundwaystomakeleftoverstastegood.IwenttoIlantolearnaboutsomeoftheirspecialfood.AsIwasthereIlearnedaboutthefoodandthehistoryofthearea.Ilearnedthattheydon’twastefoodeitherandtheyuseleftovers! Manyyearsagotherewasnotenoughfoodforeveryone.Peoplelearnedtocookandeatalmosteverything.Theyhadtothinkofwaystomakespecialdishes.Oneofthesedishesiskaozha.It’smadewithleftoverslikemeat;soupoilandfat.Thatmightnotsoundverygoodbutitdoestastegood.Todaykaozhaisaspecialdishatbigbanquets. Anotherfamousdishiscalledzaobing.It’smadewithfruitmeatandotherthings.Ireallylikedit!ButIdidn’twanttoeattoomuch.Ithasalotoffatinit. IsmelledsomethingburningandIsawsmokesoIfoundanotherspecialfoodoftheIlanarea—duckmeat.Theduckmeatisputinabigoventocookit.Smokekeepsthemeatfresh.Idon’tusuallyeatmeatbutthisduckmeatwasdelicious!Ittastedsweet. Ilanisagreatplacewithdeliciousfood.IhopeIcancomebackagain! Therearekindsofspecialfoodmentionedinthepassage.
athardchangeupbeforewinhappendownchoosepractisecomepartLifeisnoteasysoI’dliketosayWhenanything46believeinyourself!WhenIwasayoungboyIwastooshytospeaktoanyone.Myclassmatesoftenlaughed47me.Iwassadbutcoulddonothing.Latersomethinghappenedandit48mylife.ItwasanEnglishspeechcontest.Mymotheraskedmetotake49init.Whataterribleidea!ItmeantIhadtospeak50alltheteachersandstudentsofmyschool!Comeonboy.Believeinyourself!Youaresureto51ThenmotherandItalkedaboutmanydifferenttopics.AtlastI52thetopicBelieveinyourself.Itriedmybesttorememberallthespeechand53itover100times.Withmymother’sgreatloveIdidwellinthecontest.Icould54believemyearswhenthenewscamethatIhadwonthefirstplace.Iheardthecheersfromtheteachersandstudents.Thoseclassmateswhooncelooked55onmeallsaidcongratulationstome.
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