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已知函数f(x)=3ax-2x2+lnx,a为常数。 (1)当a=l时,求f(x)的单调区间; (2)若函数f(x)在区间[1,2]上为单调函数,求a的取值范围。
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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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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. Whichofthefollowingissimilarinmeaningtothefather’swordsinthesecondparagraph.
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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! Thewriterlearnsfromherparents.
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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