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已知函数f（x）＝|x﹣a|﹣+a﹣2有且仅有三个零点，且它们成等差数列，则实数a的取值集合为 ．
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高三下学期数学《》真题及答案
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已知函数fx=则下列关于函数y=f[fx]+1的零点个数是
当a＞0时，函数F.（x）有2个零点
当a＞0时，函数F.（x）有4个零点
当a＜0时，函数F.（x）有2个零点
当a＜0时，函数F.（x）有3个零点
1m为何值时fx＝x2＋2mx＋3m＋4.①有且仅有一个零点②有两个零点且均比－1大2若函数fx＝|
已知函数fx=则下列关于函数y=f[fx]+1的零点个数是
当a＞0时，函数F.（x）有2个零点
当a＞0时，函数F.（x）有4个零点
当a＜0时，函数F.（x）有2个零点
当a＜0时，函数F.（x）有3个零点
证明函数fx=xe2x-2x-cosx有且仅有两个实零点且一正一负．
已知函数fx＝4x＋m·2x＋1有且仅有一个零点求m的取值范围并求出该零点.
若函数fx＝ax2－x－1有且仅有一个负零点求实数a的取值范围.
已知函数fx＝4x＋m·2x＋1仅有一个零点求m的取值范围并求出零点.
已知函数fx为奇函数且该函数有三个零点则三个零点之和等于________.
已知函数fx＝－kxx≥0k∈R有且只有三个零点设此三个零点中的最大值为则＝.
函数fx＝mx2－2x＋1有且仅有一个正实数的零点则实数m的取值范围是________.
若函数fx＝x2－ax＋1有且仅有一个零点则实数a的值为
0
2或－2
－2
2
已知函数fx＝－x3＋ax2＋bx＋c在－∞0上是减函数在01上是增函数函数fx在R.上有三个零点且
已知fx是定义域为R.的奇函数且在－∞0内的零点有2012个则fx的零点的个数为________.
1m为何值时fx＝x2＋2mx＋3m＋4.①有且仅有一个零点②有两个零点且均比－1大2若函数fx＝|
若函数fx＝m－1x2＋2m＋1x－1有且仅有一个零点则实数m的取值集合是.
已知fx是定义在R上且周期为6的奇函数当x∈03时fx=lg2x2﹣x+m.若函数fx在区间[﹣33
已知函数fx是定义域为R.的奇函数－2是它的一个零点在02内无零点且在2＋∞上是增函数则该函数有__
已知函数fx是定义在R.上的偶函数当x≥0时fx＝ex－ax若函数在R.上有且仅有4个零点则a的取值
已知函数fx=且函数F.x=fx+x-a有且仅有两个零点则实数a的取值范围是.
已知函数fx＝4x＋m·2x＋1有且仅有一个零点求m的取值范围并求出该零点.
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函数fx＝Acosωx+φA＞0ω＞0φ∈﹣π0的部分图象如图所示要得到函数y＝Asinωx的图象只需将函数fx的图象
10分 ParentsModelHealthyEating Itshouldcomeasnosurprisethatthemorestressedparentsareatworkthegreatertheburdenontheirfamilyis.1Afterallthemoretimeparentsspendworkingthelesstimeandenergytheyhavetoplanandpreparehealthfulmeals. Foryearsmoststudieshavefocusedontheroleofworkingmotherswhilefatherswereignored.Theydidn'tlookatthefamilyasawhole.2Itaddsanewwrinkletotherelationshipbetweenworkstressandfamilynutrition. Moms'workrelatedstressisstillacentralfactorinhowwellfamilieseatbecausetheytypicallydomostofthefoodshoppingandcooking.3Thestudyfoundthatwhenmomordadexperiencehighlevelsofworkrelatedstresstheirfamiliesareeatingone﹣and﹣a﹣halffewerfamilymealsperweekandtheparentsthemselvesreporteatingfewerfruitsandvegetablesmorefastfoodandarelesslikelytoeatbreakfastregularly. It'sworthnotingthatthestudylookedmainlyatlowincomefamilieswhobelongedtoethnicorminoritygroups.4Buttheimplicationsarewideranging. 5Teachingkidsespeciallyteenagerstohelpwithgroceryshoppingandtocookactualmealsinsteadofjustputtingafrozenpizzainthemicrowavecouldbeanimportantpieceofthepuzzleinhelpingfamiliesimprovestheireatinghabits. A.Butdad'sworkrelatedstresshasalargeimpacttoo. B.Astofamilynutritiontheentirefamilyplaysaroleevenkids. C.Yetthekids'stressmayaffectthefamilies'nutritiontoo. D.Sothefindingsdon'tnecessarilyapplydirectlytoothertypesoffamilies. E.It'salsoprobablynotasurprisethatthiscannegativelyaffectafamily'snutrition. F.Howeverarecentstudydoesandlookattheroleoffathersinparticular. G.Itisparentswhogivetheirkidsagoodmodeltodevelopagoodeatinghabit.
15分Englishisalanguage1bringtoBritaininthe5thcenturybyAnglo﹣SaxonsettlersfromvariouspartsofNorthwestGermany.ItisconvenienttodivideEnglishintothreeperiodsroughly─OldEnglishMiddleEnglishandModernEnglish. The2earlyformofEnglishiscalledOldEnglishorAnglo﹣Saxon.OldEnglishdevelopedfromasetofNorthSeaGermanicdialects3originspokenalongthecoastsofFrisiaLowerSaxonyJutlandandSouthernSwedenbyGermanictribesknown4theAnglesSaxonsandJutes.LaterOldEnglishwasstronglyinfluencedbytheNorthGermaniclanguageNorsespokenbytheVikingswhosettledmainlyinthenorthwest.ThemostfamousworkfromtheOldEnglishperiodistheepicpoemBeowulfwrittenby5unknownpoet.OldEnglishisverydifferentfromModernEnglishanddifficultforthe21st﹣centuryEnglishspeakerstounderstand. Forthe300yearsfollowingtheNormanConquestin1066theNormankingsandthenobilityspokeonlya6varyofFrenchcalledAnglo﹣Norman.Englishcontinuedtobethelanguageofthecommonpeople.TheNormaninfluence7strongthecontinualevolutionofthelanguageoverthefollowingcenturiesresultingin8isnowreferredtoasMiddleEnglish.Andoneofthebest﹣knownworksfromtheMiddleEnglishperiodisGeoffreyChaucer'sTheCanterburyTales. Fromthelate15thcenturythelanguagechangedintoEarlyModernEnglishoftendatedfromtheGreatVowelShift.EnglishiscontinuouslyabsorbingforeignwordsespeciallyLatinandGreekcausingEnglishtohavethelargestvocabularyofanylanguageintheworld.Bythelate18thcenturytheBritishEmpirehadspedthespreadofEnglishthroughitscoloniesandgeopoliticaldominance.CommercescienceandtechnologydiplomacyartandformaleducationallcontributedtoEnglish9becomethefirsttrulygloballanguage.Astherearemanywordsfromdifferentlanguagestheriskofmispronunciationishigh.In1755SamuelJohnsonpublishedhisADictionaryoftheEnglishLanguage10introducedastandardsetofspellingconventionsandusagenorms.
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已知正项等比数列{an}的前n项和为Sn若2S2S64S4成等差数列a5＝2则a1＝
蛋白质合成过程中氨基酸分子脱水缩合形成的化学键是
已知存在正实数xy满足2ax2+x2﹣y21ny﹣lnx＝0则实数a的取值范围是
在直角坐标系x0y中曲线C1的参数方程为t为参数且t≠0a∈[0π曲线C2的参数方程为θ为参数以O为极点x轴正半轴为极轴建立极坐标系曲线C3的极坐标方程为ρ＝4cosθ． 1求C2的普通方程及C3的直角坐标方程 2若曲线C1与曲线C2C3分别交于点AB求|AB|的最大值．
中国国际智能产业博览会智博会每年在重庆市举办一届每年参加服务的志愿者分“嘉宾”“法医”等若干小组.2018年底来自重庆大学西南大学重庆医科大学西南政法大学的500名学生在重庆科技馆多功能厅参加了“志愿者培训”如图是四所大学参加培训人数的不完整条形统计图现用分层抽样的方法从中抽出20人作为2019年中国国际智博会服务的志愿者． 1分别求出从重庆大学西南大学重庆医科大学西南政法大学抽出的志愿者人数 2若“嘉宾”小组的2名志愿者只能从重庆医科大学或西南政法大学抽出求这2人分别来自不同大学的概率结果用分数表示．
1分None'sheaddoesnotalwaysmeansshowingagreementunderstandingorapproval.
6分 FourBestPlacestoTravelfortheSummerof2019 Ifyou'restilldecidingwheretotakeyoursummervacation2019bringsmajoranniversariesnewflightroutesbuzzymuseumopeningsandmore.Innoparticularordercheckoutourpicksforwheretotravelthissummer SalardeUyuniBolivia TheSalardeUyuniorUyuniSaltFlatisavastexpanseneartheBolivianAndesthatresemblesice.Thesurreallandscapeisactuallyleftoversaltfromancientlakes.Alargeloungedomeoffersapublicspacewithtablesfloorcushionsandhanginglanterns.FoodisprovidedbyGustuinLaPazconsideredoneofLatinAmerica'stoprestaurants.BeyondsimplyenjoyingthefoodandsceneryguestscanhiketothecraterofTunupaVolcanomountainbikeacrosstheSalarorvisitthevillageofJirira.Comenightfallon﹣sitetelescopestakefulladvantageofthestar﹣floodedsky. LasVegas There'stheParkTheaterwhereupto5200peoplecanenjoyA﹣listartistresidenciesLadyGagaiscurrentlyinresidenceuntilNovemberwithJanetJacksonandCherstartingthissummer.ForgoodmeasureBrunoMarswillalsobeperformingsomedatesinSeptember.DanielHummandWillGuidaraperhapsbestknownforNYC'sElevenMadisonParkrestaurantarebehindtheNoMadRestaurantandNoMadBar.AndfoodieswillnodoubtwanttoexperienceRoyChoi'sBestFriendthefirstbrick﹣and﹣mortarrestaurantfollowinghishugelysuccessfulKoreanBBQtruck. NovaScotia NovaScotiaoftengetsoverlookedforpopularprovinceslikeBritishColumbiaandQuebecbutitsquietcharmsareworthexploring.CapeBretonIslandtakesabitofworktoreachbutit'sherethatyou'llfindchallenginghikingtrailsascenicdrivingrouteminusthetrafficandreal﹣dealCelticculture.TheHalifaxJazzFestivalheldintheprovince'scapitalisconsideredNovaScotia'slargestmusicfestivalandgoesdownfromJuly9﹣14onthewaterfront. GrandCanyon It'stheGrandCanyon's100thanniversaryasanationalparkandtherearemultiplewaystocelebratethisnotableoccasion.FromJune22﹣29stargazerscanjoinamateurastronomersforfreeatthepark'sNorthandSouthRimsfortheStarParty.TelescopeswillbeonhandtofindplanetsJupiterandSaturnamongthemstarclustersandnebulae.Therewillalsobeslideshowprogramswithadifferentfocuseachnightfromprotectingdarkskiestolearninghowplanetsform.Constellationtalksandnightskyphotographyworkshopsareamongthefreeofferingsjustallowyourselfenoughtimesinceyouwon'tbetheonlyonewiththisidea. 1Whichplacewillyouchooseifyouwanttohaveagreatbarbeque A.SalardeUyuni B.LasVegas C.NovaScotia D.GrandCanyon 2WhichcountryisNovaScotiaprobablyin A.Canada B.America C.Britain D.SouthAfrica 3IfyouareanAstronomyfanswhichtwoplaceswillbethebestchoice A.SalardeUyuniandLasVegas B.SalardeUyuniandGrandCanyon C.LasVegasandNovaScotia D.LasVegasandGrandCanyon
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