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若△ABC的内角A,B,C满足6sinA=4sinB=3sinC,则cosB=().
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若△ABC的内角满足sinAsinCsinB成等差数列则cosC的最小值是.
在△ABC中三内角A.B.C.及其对边abc满足sinA.-B.=sinA.+sinB.Ⅰ求角A.的
在△ABC中若3sinA+4cosB=64sinB+3cosA=1则角C.为
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在△ABC中A﹣40B40点C运动时内角满足2sinA+sinC=2sinB求顶点C的轨迹方程.
△ABC的内角A.B.C.的对边分别为abc若sinAsinBsinC成等比数列且c=2a则cosB
若△ABC的内角满足sinA+sinB=2sinC则cosC的最小值是.
设△ABC的内角A.B.C.所对边的长分别为abc若b+c=2a3sinA=5sinB则角C.=__
△ABC中sinA+sinBsinB十sinC2sinC-sinA=152018则最大内角等于___
设△ABC的内角
,
,
所对的边分别为a,b,c,若三边的长为连续的三个正整数,且A.>B.>C.,3b=20acosA,则sinA∶sinB∶sinC为 A.4∶3∶2 B.5∶6∶7C.5∶4∶3
6∶5∶4
已知B.-60C.60是△ABC的两个顶点内角A.B.C.满足sinB-sinC=sinA则顶点A.
在△ABC中abc分别为内角ABC的对边若a+c=42sinB=sinA+sinC则△ABC的面积
2
2
4
设△ABC的三个内角为A.BC向量m=sinAsinBn=cosBcosA若m·n=1+cosA+B
已知函数fx=cosxabc分别为△ABC的内角
,
,
所对的边,且3a
2
+3b
2
﹣c
2
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f(cosA)≤f(cosB)
在△ABC中内角A.B.C.的对边分别为abc已知a-b=2c=4sinA=2sinB.则△ABC的
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A.
B.
在△ABC中内角A.B.C.的对边分别为abc且满足sin2A.+sinA.sinB.-6sin2B
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,
,
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6∶5∶4
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设△ABC的内角ABC所对的边分别为abc若三边的长为连续的三个正整数且A>B>C3b=20acos
4:3:2
5:6:7
5:4:3
6:5:4
若△ABC的内角满足sinA.+sinB.=2sinC.则cosC.的最小值是________.
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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.
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! ShefindsthatpeopleinIlan.
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TheJapaneseMacacamonkeyhasbeenstudiedinthewildforover50years.In1952ononesmallJapaneseislandscientistsdroppedsome16inthedirtforthemonkeys.Themonkeyslikedtheirtastebuttheyfoundthedirt17. Oneclever18-month-oldmonkeyfoundshecould18theproblembywashingthesweetpotatoesinanearbyriver.Shetaughtthistohermother.Her19alsolearnedthisnewwayandtheytaughttheirmotherstoo. Alltheyoungermonkeys20learnedtowashthedirtysweetpotatoestomakethem21toeat.Butmanyoldmonkeysfounditveryhardtolearnthisandstillatethe22sweetpotatoes. Thensomethingverystrange23.Intheautumnof1958scientistsfoundthatthemonkeysonothernearby24beganwashingtheirsweetpotatoestoo.Scientistsstilldon’tfullyunderstandhowthisknowledgewas25fromoneislandtoanother. 25.
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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.
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. Thewordquitinthepassagemeans.
athardchangeupbeforewinhappendownchoosepractisecomepartLifeisnoteasysoI’dliketosayWhenanything46believeinyourself!WhenIwasayoungboyIwastooshytospeaktoanyone.Myclassmatesoftenlaughed47me.Iwassadbutcoulddonothing.Latersomethinghappenedandit48mylife.ItwasanEnglishspeechcontest.Mymotheraskedmetotake49init.Whataterribleidea!ItmeantIhadtospeak50alltheteachersandstudentsofmyschool!Comeonboy.Believeinyourself!Youaresureto51ThenmotherandItalkedaboutmanydifferenttopics.AtlastI52thetopicBelieveinyourself.Itriedmybesttorememberallthespeechand53itover100times.Withmymother’sgreatloveIdidwellinthecontest.Icould54believemyearswhenthenewscamethatIhadwonthefirstplace.Iheardthecheersfromtheteachersandstudents.Thoseclassmateswhooncelooked55onmeallsaidcongratulationstome.
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.
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. Thewriterofthetexthasaattitudetowardsdangeroussports.
TheJapaneseMacacamonkeyhasbeenstudiedinthewildforover50years.In1952ononesmallJapaneseislandscientistsdroppedsome16inthedirtforthemonkeys.Themonkeyslikedtheirtastebuttheyfoundthedirt17. Oneclever18-month-oldmonkeyfoundshecould18theproblembywashingthesweetpotatoesinanearbyriver.Shetaughtthistohermother.Her19alsolearnedthisnewwayandtheytaughttheirmotherstoo. Alltheyoungermonkeys20learnedtowashthedirtysweetpotatoestomakethem21toeat.Butmanyoldmonkeysfounditveryhardtolearnthisandstillatethe22sweetpotatoes. Thensomethingverystrange23.Intheautumnof1958scientistsfoundthatthemonkeysonothernearby24beganwashingtheirsweetpotatoestoo.Scientistsstilldon’tfullyunderstandhowthisknowledgewas25fromoneislandtoanother. 23.
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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.
已知椭圆AB是椭圆上的两个点线段AB的垂直平分线与x轴相交于点Px00证明
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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