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已知函数f（x）＝Asin（ωx+φ）（其中A＞0，ω＞0，0＜φ＜π）的图象关于点M（）成中心对称，且与点M相邻的一个最低点为N（），则对于下列判断： ①直线x＝是函数f（x）图象的一条对称轴；...
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高三下学期数学《》真题及答案
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已知函数y=Asinωx+φA＞0|φ|＜π的一段图象如图所示则函数的解析式为.
已知函数fx=Asinωx+ϕA.＞0ω＞00≤ϕ≤π的部分图象如图所示则y=fx的解析式是fx=.
已知函数fx=Asinωx+φA>0ω>00
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已知函数fx=Asincox+其中x∈R.A.>0>0的最大值为2最小正周期为8.I.求函数fx的解
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函数fx＝Asinωx＋φA>0ω>0|φ|
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.已知a>0函数fx＝－2asin时－5≤fx≤1.1求常数ab的值2设gx＝f且lggx>0求gx
已知函数fx=Asinωx+φx∈R.ω＞00＜φ＜的部分图象如图所示.Ⅰ求函数fx的解析式Ⅱ求函数
已知函数fx=Asinωx+φ
，ω，φ均为正的常数）的最小正周期为π，当x=
时，函数f（x）取得最小值，则下列结论正确的是（ ） A.f（2）＜f（﹣2）＜f（0）
f（0）＜f（2）＜f（﹣2）
f（﹣2）＜f（0）＜f（2）
f（2）＜f（0）＜f（﹣2）
已知函数fx=Asinωx+φ其中A＞0ω＞0的部分图象如图所示为得到函数fx的图象可将函数y=As
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已知函数fx=Asinωx+φA.＞0ω＞0|φ|＜的部分图象如图所示.求函数fx的解析式.
已知函数fx＝Asinωx＋φA＞0ω＞0|φ|＜x∈R的图象的一部分如图所示.1求函数fx的解析式
已知定义在R.上的函数fx=asinωx+bcosωxω＞0a＞0b＞0的周期为π且fx的最大值为2
已知函数fx=Asinωx+φA.＞0ω＞0|φ|＜的图象如图所示则函数的解析式为fx=.
已知函数fx＝Asinωx＋φA>0ω>0|φ|
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Fewfactsaboutmodemlifeseemmoreundeniablethanhowbusyeveryoneseemstobe.Acrosstheindustrializedworldlargenumbersofsurveyrespondentstellresearchersthey'reoverburdenedwithworkattheexpenseoftimewithfamilyandfriends. ButthetotaltimepeopleareworkingwhetherpaidorotherwisehasnotincreasedinEuropeorNorthAmericainrecentdecades.What'smorethedataalsoshowthatthepeoplewhosaythey'rethebusiestgenerallyaren't. Partoftheanswerissimpleeconomics.Aseconomiesgrowandtheincomesofthebetter﹣offhaverisenovertimetimehasliterallybecomemorevaluableAnygivenhourisworthmoresoweexperiencemorepressuretosqueezeinmorework. Butit'salsoaresultofthekindofworkinwhichmanyofusareengaged.Inthepastfarmingworkwassubjecttoweatherlimitswhileatpresentpeopleliveinanunlimitedworldandtherearealwaysmoreincomingemailsmoremeetingsmorethingstoreadanddigitalmobiletechnologymeansyouhaveafewmoreto﹣dolistitems. Withtimepressureweighingusdownit'shardlysurprisingthatwelivewithoneeyeontheclock.Butpsychologicalresearchdemonstratesthatthistime﹣awarenessactuallyleadstoworseperformance.Sotheironicconsequenceofthebusyfeelingisthatwecouldhandleto﹣dolistlesswellthanifweweren'tsorushed. Arguablyworstofallthefeelingofrushspreadstoaffectourleisuretimesothatevenwhenlifefinallydoespermitanhourortwoforrecoveryweendupfeelingthatleisuretimeshouldbespentproductivelytoo. Ifthere'sasolutiontothebusynessepidemic流行病otherthantheuniversal21﹣hourworkweekitmaylieinclearlyrealizingjusthowreasonableourattitudeshavebecome.Historicallytheultimatesymbolofwealthachievementandsocialsuperioritywasthefreedomnottowork.Nowit'sbusynessthathasbecometheindicatorofhighstatus.Thebest﹣offinoursocietyareoftenverybusyandhavetobesaysGershunny.YouaskmeamIbusyandItellyou‘YesofcourseI'mbusybecauseI'manimportantperson! Toooftenwemeasureourworthnotbytheresultsweachievebutbyhowmuchofourtimewespend.Welivecrazylivesatleastinpartbecauseitmakesusfeelgoodaboutourselves. 1Accordingtotheauthorpeople'sfeelingaboutbusynessresultsfrom. A.theincreaseintimevalue B.thesacrificeoffamilytime C.thelongerworkingtime D.thechangeofworkingpartners 2Theunderlinedphraseweighingusdowninparagraph5isclosestinmeaningto. A.makingusoverburdened B.havingapositiveeffectonus C.measuringusinallaspects D.givingustimeforreflection 3WhichofthefollowingstatementsisTRUEaccordingtothepassage? A.Thesolutiontobusynessisapplyinga21﹣hourworkweek. B.Ifpeoplehadleisuretimetheywouldrelaxthemselves. C.Thefeelingofbeingburdenedspellslowproductivity. D.Freedomisoverrepresentedinthecurrentsociety. 4Whatdoesthepassagemainlyconcernedwith? A.Themeasurementofwealthinthecurrentsociety. B.Theevolutionofpeople'sattitudetowardsbusyness. C.Thehiddenreasonsandeffectsofpeople'sbusyness. D.Thesolutiontoprioritizingthecrucialtasksinbusyness.
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StudentsinCaldwellIdahocanattendclassintheirpajamas睡衣!AtVallivueVirtualAcademycoursesaretaughtonline.Studentsworkathomewithparentswhoserveaslearningcoaches.Acertifiedteacher1thestudents'progress. Thecyberschoolwas2asafreeoptionforstudentsinkindergartenthroughgrade8whohavetroublesucceedinginthedistrict's3publicschool.Supportersoftheprogramsaythatvirtualschoolshelpstudentsavoidthesocialpressuresthatcan4withlearning.Inadditionsupportersargueonlinecoursesprovidekidswithmorefocused5andcourseoptionsthantheycangetinatypicalschool. Noteveryonegivescyberschoolsapassinggradehowever.Someeducatorsarguethatonlinelearningmakesithardforstudentstomakefriends.Manyparentsalsofeelthatcyberschoolsput6timedemandsonthembecausetheyhavetooverseetheirkids'dailywork. Technologycanbenefiteducationbutitshouldn't7education.Studentswhogotovirtualschoolswillmissmanyofthebenefitsofbeinginarealschool. Ifkidsattendschoolonlinetheywillmissoutonimportantsocial8.PaytonMcdonough13aseventhgraderfromGlencoeIll.agrees.Idon'tknowhowIcouldsitatacomputeralldaywithout9interactingwithmypeersandteachershesays. Inadditionvirtualschoolsdon'thaveenoughstructure.Studentswhotakeonlinecoursescansettheirownscheduleswhichwillcauseproblemsforstudentswhohavetroublestaying10. Furthermoreonlineschoolingputsstressonparentsbecausetheyhaveto11whattheirkidsdoathome.Manyparentshavefull﹣timejobs.Howaretheygoingtoruntheirchildren'seducation12intheirjobsandtakecareoftheirotherresponsibilitiesathome? Virtualschoolswillmakeitharderforstudentstolearnandwillputtoomuchpressureonparents. Virtuallearningdoesnotneedtoreplaceclassroomlearning13butitcanhelpstudentsworkattheirownpace.Ifstudentsstrugglewithsubjectstheycantakethosecoursesonlineandspendmoretimeonthem.Virtualschoolscanalsoofferstudentsmuchmore14schedules.Studentsoftenhandleextracurricularactivitiessportsandschoolworkandcyberschoolscouldhelpthemmanageeverything. Finallyattendingvirtualschoolcanpreparestudentsforcollegeandforworkafter15.WeneedtoberesponsibleforworkingonourownsaysAngelaGosciloaseniorfromPoundRidgeN.Y.Weneedtodeveloptechnologyskillsthatwillhelpusinwhateverwedo.Gettinganearlystartisagoodidea. 1A.oversees B.suspected C.admitted D.predicted 2A.tolerated B.launched C.undergone D.transformed 3A.virtual B.superior C.traditional D.specialized 4A.agree B.putup C.go D.interfere 5A.attention B.definition C.foundation D.instruction 6A.unlimited B.uncivilized C.unrealistic D.unaffected 7A.turnto B.takeover C.takein D.makeup 8A.interactions B.education C.occupation D.identification 9A.actually B.presently C.naturally D.logically 10A.examined B.motivated C.exhausted D.represented 11A.compliment B.award C.supervise D.tempt 12A.negotiate B.innovate C.control D.excel 13A.entirely B.partially C.regularly D.purposely 14A.sustainable B.flexible C.relevant D.optimistic 15A.school B.study C.graduation D.education
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IhadateacherwhousedtowakeusupinclassbyshoutingTheearlybirdgetstheworm!Isaylethimhavetheworm.Ihatefoodthatdoesn'tstaystillandavoidJapaneserestaurantsforthatveryreason.AnywayIstoppedeatingwormsattheageofthreeswitchingtoregularbreakfastsofcereal谷物towhichIwouldaddextrasugar. RecentlyIwasthinkingaboutearlybirdsandthecompetitivespiritafterreceivingaletterfromareaderinMalaysiaMysondeliberatelythrowsawaymarksbecausehedoesn'tliketobetopoftheclass.WhatshallIdo?Givehimaroundofapplauseforbeingsmart!ActuallymanychildreninAsiatendtobethefocusbyperformingbetter. PlacedintoaverycompetitiveclasswhenIwas11Iquicklylearnedtheidealpositionwassecondtolast.Thetopthreeperformersandtheverylastpersonarehighlightedthesecond﹣to﹣lastcontestantisINVISIBLE.Andifsaneasypositiontoget～justdeliberatelyunderperformateverytest.Icoulddothat.Ioncecamesecondtolastineightstraightsportsdayraces.Noonesuspectedanything.IwassoinvisiblethatIcouldhaverobbedabankinmystreetandnoonewouldhavenoticed. AttheLondonOlympicsafewmonthsagobadmintonpairsfromthreeAsiancountriesdeliberatelytriedtolosematchestodrawgoodlotsinlaterrounds.Itwasfunnytowatchbuttheywereallthrownoutforpoorsportsmanship.Whattheyreallyneededwereactinglessonstheirmovesweresounconvincing.OopsIhittheballinentirelythewrongdirection. TheotherdayItookthechildrenoutandtheyracedforthecar.I'mfirstsaidone.ThesecondsaidFirstisworstsecondisbest.TogethertheysangatthelastoneAndthird'stheonewithahairychest. Itstruckmethattheorganizersofsportsmatchescouldusethissongwhenpeopledeliberatelylosematches.Ilostthedelightedloserwillsay.ThejudgescouldstilldeclarethemwinnerspointingtoanewoptionalregulationFirstisworstsecondisbestthird'stheonewithahairychest. 1WhydidtheauthordislikeJapaneserestaurant? A.Itsfoodwasservedraw. B.Itsfoodcontainedworms. C.Hewastemptedbycereal. D.Hewasaffectedbythesaying. 2Howdidtheauthormanagetobeinvisibleinacompetitiveclass? A.Hehighlightedthetopthreestudents. B.Hecametosecondinsportsraces. C.Hehidhimselfinabankskillfully. D.Heintentionallyunderperformed. 3Whatcanbelearnedfromthepassage? A.Thejudgeisencouragedtoeliminatethedishonestplayers. B.PlayersdisqualifiedfromOlympicdoublesforusingdrugs. C.Children'ssongpraisesthedramaticactingskillsofathletes. D.Playerspurposefullyfailedforeasierlotsinthefollowingrounds. 4Whichsayingmighttheauthorpossiblysupport? A.Greatmindsthinkalike. B.Godfavorsthosewhoareprepared. C.Honestyisthebestpolicy. D.Abirdinhandisworthtwointhebush.
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ThebiggesthouseofcardsthelongesttongueandofcoursethetallestmantheseareamongthethousandsofrecordsloggedinthefamousGuinnessBookofRecords.Createdin1955afteradebate1concernEurope'sfastestgamebird2beganasamarketingtoolsoldtopublandlords3promoteGuinnessanIrishdrinkbecamethebestsellingcopyrighttitleofalltimeacategorythatexcludesbookssuchastheBibleandtheKoran.Intimethebookwouldsell120millioncopiesinover100countries﹣quitealeapfromitshumblebeginnings. Initsearlyyearsthebooksetitssightson4satisfyman'sinborncuriosityaboutthenaturalworldaroundhim.ItstwoprincipalfactfinderstwinsNorrisandRossMcWhirtermovedwildlyaroundtheglobetocollectfacts.Itwastheirtasktofindanddocumentaspectsoflifethatcanbesensedorobservedthingsthatcanbequantifiedormeasured.Butnotjustanythings.Theywereonlyinterestedinsuperlativesthebiggestandthebest.Itwasduringthisperiod5someoftheremarkableGuinnessRecordsweredocumentedansweringsuchquestionsasWhatisthebrighteststar?andWhatisthebiggestspider? Onceawareofthepublic'sthirstforsuchknowledgethebook'sauthorsbegantobranchouttocoverincreasinglydoubtfullittle﹣knownfacts.Theystarteddocumentinghumanachievementsaswell.AforerunnerforrealitytelevisiontheGuinnessBookgavepeople6chancetobecomefamousforaccomplishingoddoftenpointlesstasks.Recordsweresetin1955forconsuming24raweggsin14minutesandin1981forthefastestsolvingofaRubik'sCubewhichtookamere38seconds.In1979amanyodeled用真假嗓音交替唱non﹣stopfortenandaquarterhours. Initslatestappearancethebookhasfoundanewhomeontheinternet.Nolonger7restricttothelimitsofphysicalpapertheGuinnessWorldRecordswebsitecontainsseeminglyinnumerablefactsconcerningsuchtopicsasthemostpowerfulcombustion燃烧engineortheworld'slongesttrain.Whatisstrikinghoweveristhatsuchfactsarefoundsharingapagewiththerecordoftheheaviesttraintobepulled8abeard. OriginatingasasimplebarbooktheGuinnessBookofRecords9evolveoverdecadestoprovideinsightintothefullrangeofmodernlife.Andalthoughonemaybe10likelynowtolearnaboutthewidesthumanmouththanthehighestnumberofcasualtiesinasinglebattleoftheCivilWartheGuinnessWorldRecordswebsiteoffersatellingglimpseintothefutureoffact﹣findingandrecord﹣recording.
一个数的减去4.5的5倍差是18这个数是多少用方程解
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18和24所有的公约数的和是所有公约数的积的
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A.Onereasonthatit'surgentisthatcountriesaresendingmoreandmoreobjectsintospace. B.Therearealsomillionsofsmallerpiecesofjunkthatwecan'tsee. C.Blowingupoldersatelliteswithamissilemaycreatethousandsofsmallerpieces! D.Intheupperpartsoftheatmosphereitwillburnup. E.Whentwoobjectsinspacecollidethetwoobjectsbreakintomanysmallerpieces. F.Yearsofspaceexplorationhavelefttonsofspacejunkinorbitaroundtheplanet. ManypeopleknowthattrashisabigproblemonplanetEarth.Whatmanypeopledon'tknowisthattrashhasbecomeaprobleminouterspacetoo.1Statisticallytherearemorethan22000piecesofjunkinspacearoundtheearth.Andthesearejusttheitemsthatwecanseefromthesurfaceoftheearthbytelescopesorradars.2Objectslikebitsofoldspacerocketsorsatellitesmovearoundtheplanetatveryhighspeedssofastthatevenaverysmallpiececanbreakimportantsatellitesorbecomedangeroustopeopleparticularlyastronauts.Ifthetiniestpieceofjunkcrashedintoaspacecraftitcoulddamagethevehicle.That'sbecausethefasteranobjectmovesthegreatertheimpactiftheobjectcollideswithsomethingelse. Tohelpminimizeadditionalspacejunkcountriesaroundtheworldhaveagreedtolimitthetimetheirspacetoolsstayinorbitto25years.Eachtoolmustbebuilttofallsafelyintotheearth'satmosphereorthemassofgasesthatsurroundtheearthafterthat.3Manyscientistsarealsoproposingdifferentwaystocleanupspacejunk.TheGermanshavebeenplanningaspacemissionwithrobotsthatwouldcollectpiecesofspacetrashandbringthembacktoEarthsothattheycanbesafelydestroyed. Inouropiniontheproblemisverychallengingandit'squiteurgentaswellsaidMarcoCastronuovoanItalianSpaceAgencyresearcherwhoisworkingtosolvetheproblem.4Manyoftheseobjectsaretoolsthathelppeopleusetheircellphonesorcomputers. Thetimetoactisnowaswegofartherintimewewillneedtoremovemoreandmorefragmentshesays.
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MiltonHersheywasbornnearthesmallvillageofDerryChurchPennsylvaniain1857.Heonlyattendedschoolthroughthefourthgradeatthatpointhewasapprenticed做学徒toaprinterinanearbytown.AfterawhilehelefttheprintingbusinessandwasapprenticedtoaLancasterPennsylvaniacandymaker.AndattheageofeighteenheopenedhisowncandystoreinPhiladelphia.Inspiteofhistalentsasacandymakertheshopfailedaftersixyears. AfterthefailureofhisPhiladelphiastoreMiltonheadedforDenverwherehelearnedtheartofmakingcaramels焦糖.TheninDenverMiltononceagainattemptedtoopenhisowncandy﹣makingbusinessesinChicagoNewOrleansandNewYorkCity.Finallyin1886hewenttoLancasterPennsylvaniawhereheraisedthemoneynecessarytotryagain.Thiscompany﹣theLancasterCaramelCompany﹣establishedMilton'sreputationasamastercandymaker. In1893MiltonattendedtheChicagoInternationalExpositionwherehesawadisplayofGermanchocolate﹣makingimplements.FascinatedbytheequipmenthepurchaseditforhisLancastercandyfactoryandbeganproducingchocolatewhichheusedforcoatinghiscaramels.Bythenextyearproductionhadgrowntoincludecocoasweetchocolateandbakingchocolate.TheHersheyChocolatecompanywasbornin1894asasubsidiary子公司oftheLancasterCaramelCompany.SixyearslaterMiltonsoldthecaramelcompanybutreservedtherightsandtheequipmenttomakechocolate.Hebelievedthatalargemarketofchocolateconsumerswaswaitingforsomeonetoproducereasonablypricedcandy.Hewasright. MiltonHersheyreturnedtothevillagewherehehadbeenbornintheheartofdairycountryandopenedhischocolatemanufacturingplant.Withaccesstoallthefreshmilkheneededhebeganproducingthefinestmilkchocolate.TheplantthatopenedinasmallPennsylvaniavillagein1905istodaythelargestchocolatefactoryintheworld.Thesweetscreatedatthisfacilityarefavoritesaroundtheworld. TheareawherethefactoryislocatedisnowknownasHersheyPennsylvania.WithinthefirstdecadesofitsexistencethetownofHersheythrivedasdidthechocolatebusiness.Abankaschoolchurchesadepartmentstoreevenaparkandatrolleysystemallappearedinshortorderthetownsoonevenhadazoo.TodayavisittothearearevealstheHersheyMedicalCenterMiltonHersheySchoolandHershey'sChocolateWorld﹣athemeparkwherevisitorsaregreetedbyagiantReesesPeanutButterCup.Allofthesethings﹣andahugenumberofhappychocolatelovers﹣weremadepossiblebecauseacaramelmakervisitedtheChicagoExpositionof1893! 1Thementionofthe1893Expositionindicatesthat A.theexpositioninChicagoisheldonceeverythreeyears. B.thethemeoftheexpositionof1893wasFoodfromAroundtheWorld. C.theexpositioncontaineddisplaysfromavarietyofcountries. D.thesiteoftheexpositionisnowabranchoftheHersheyChocolateCompany. 2AccordingtothepassageMiltonHersheysoldhiscaramelcompanyin A.1894. B.1900. C.1904. D.1905. 3Whatcanyouinferfromthepassage? A.Chocolateispopularineverycountryintheworld. B.ReesesPeanutButterCupsaremanufacturedbytheHersheyChocolateCompany. C.ChocolatehadneverbeenmanufacturedintheUnitedStatesbeforeMiltonHersheydidit. D.TheHersheyChocolateCompanynowmakesmoremoneyfromHershey'sChocolateWorldthanfromthemanufactureandsaleofchocolate. 4Theauthorwrotethispassagemainlyto A.recountthefoundingoftheHersheyChocolateCompany. B.describetheprocessofmanufacturingchocolate. C.comparethepopularityofchocolatetoothercandies. D.explainhowapprenticeshipswork.
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时，函数f（x）取得最小值，则下列结论正确的是（ ） A.f（2）＜f（﹣2）＜f（0） f（0）＜f（2）＜f（﹣2） f（﹣2）＜f（0）＜f（2） f（2）＜f（0）＜f（﹣2）
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