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已知函数,其中“a>0为常数. (I)若f(x)在区间(0,3]内单调递减,求a的取值范围; (Ⅱ)若f(x)在(0,+∞)内有且只有一个零点x0,记[x0]表示不超过x0的最大整数,求[x0]...
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高三上学期数学《》真题及答案
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f(x)在区间[-2π,0]上是增函数
f(x)在区间[-3π,-π]上是增函数
f(x)在区间[3π,5π]上是减函数
f(x)在区间[4π,6π]上是减函数
.已知函数fx=e|x-a|a为常数若fx在区间[1+∞上是增函数则a的取值范围是________.
已知函数fx=lnx+ax2+bx其中ab为常数且a≠0在x=1处的切线与x轴平行.Ⅰ当b=﹣3时求
已知函数fx的自变量的取值区间为A.若其值域也为A.则称区间A.为fx的保值区间.函数fx=x2的形
已知函数fx=e|x-a|a为常数若fx在区间[1+∞上是增函数则a的取值范围是________.
已知函数fx=lnx+其中a为常数且a>0.1若曲线y=fx在点1f1处的切线与直线y=垂直求a的值
下列命题①若函数FxΦx是同一个函数fx在区间I上的两个原函数则其差Fx-Φx等于确定的常数②设F'
(A) ①、②.
(B) ②、③.
(C) ①、④.
(D) ③、④.
已知函数fx=2|2x-m|m为常数若fx在区间[2+∞上是增函数则m的取值范围是________.
已知函数fx=3ax-2x2+lnxa为常数 1当a=l时求fx的单调区间 2若函数fx在区间[1
已知a为实常数y=fx是定义在-∞0∪0+∞上的奇函数且当x0恒成立求a的取值范围.
已知函数fx=x﹣12+alnx﹣x+1其中a∈R.且a为常数Ⅰ当a=4时求函数y=fx的单调区间Ⅱ
已知函数fx=lnx+mx其中m为常数.Ⅰ当m=﹣1时求函数fx的单调区间Ⅱ若fx在区间0e]上的最
已知函数fx=ax2-|x|+2a-1a为实常数.1若a=1求函数fx的单调区间2若a>0设函数fx
已知函数fx=2sinωx+φx∈R.其中ω>0-π<φ≤π.若fx的最小正周期为6π且当x=时fx
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f(x)在区间[4π,6π]上是减函数
设函数fx=ax﹣1+a2x2其中a>0区间I={x|fx>0}Ⅰ求I.的长度注区间aβ的长度定义为
如果函数y=fx在区间I.上是增函数而函数y=在区间I.上是减函数那么称函数y=fx是区间I.上的缓
[1,+∞)
[0,
]
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]
已知函数fx=ax4lnx+bx4﹣cx>0在x=1处取得极值﹣3﹣c其中abc为常数.1试确定ab
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(B) 若f(x)的某个原函数为零,则f(x)的所有原函数为常数.
(C) 若f(x)在区间(a,b)内不是连续函数,则在这个区间内f(x)必无原函数.
(D) 若F(x)是f(x)的任意一个原函数,则F(x)必定为连续函数.
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IntheUnitedStatesaloneover100millioncell﹣phonesarethrownawayeachyear.Cell﹣phonesarepartofagrowingmountainofelectronicwastelikecomputersandpersonaldigitalassistants.Theelectronicwastestreamisincreasingthreetimesfasterthantraditionalgarbageasawhole. Electronicdevicescontainvaluablemetalssuchasgoldandsilver.ASwissstudyreportedthatwhiletheweightofelectronicgoodsrepresentedbypreciousmetalswasrelativelysmallincomparisontototalwastetheconcentration含量ofgoldandotherpreciousmetalswashigherinSo﹣callede﹣wastethaninnaturallyoccurringminerals. Electronicwastesalsocontainmanypoisonousmetals.Evenwhenthemachinesarerecycledandtheharmfulmetalsremovedtherecyclingprocessofteniscarriedoutinpoorcountriesinpracticallyuncontrolledwayswhichallowmanypoisonoussubstancestoescapeintotheenvironment. Creatingproductsoutofrawmaterialscreatesmuchmorewastematerialupto100timesmorethanthematerialcontainedinthefinishedproducts.Consideragainthecell﹣phoneandimaginetheminesthatproducedthosemetalsthefactoriesneededtomaketheboxandpackaging包装itcamein.Manywastesproducedintheproducingprocessareharmfulaswell. TheU.S.EnvironmentalProtectionAgencynotesthatmostwasteisdangerousinthattheproductiondistributionanduseofproducts﹣aswellasmanagementoftheresultingwaste﹣allresultingreenhousegasrelease.Individualscanreducetheircontributionbycreatinglesswasteatthestart﹣forinstancebuyingreusableproductsandrecycling. Inmanycountriestheconceptofextendedproducerresponsibilityisbeingconsideredorhasbeenputinplaceasanincentive动机forreducingwaste.Ifproducersarerequiredtotakebackpackagingtheyusetoselltheirproductswouldtheyreducethepackaginginthefirstplace? Governments'incentivetorequireproducerstotakeresponsibilityforthepackagingtheyproduceisusuallybasedonmoney.Whytheyaskshouldcitiesortownsberesponsibleforpayingtodealwiththebubblewrap气泡垫thatencasedyourtelevision? Fromthegovernments'pointofviewaprimarygoaloflawsrequiringextendedproducerresponsibilityistotransferboththecostsandthephysicalresponsibilityofwastemanagementfromthegovernmentandtax﹣payersbacktotheproducers. 58.BymentioningtheSwissstudytheauthorintendstotellusthat. A.theweightofe﹣goodsisrathersmall B.E﹣wastedeservestobemadegooduseof C.naturalmineralscontainmorepreciousmetals D.thepercentageofpreciousmetalsisheavyine﹣waste 59.Theresponsibilityofe﹣wastetreatmentshouldbeextended. A.fromproducerstogovernments B.fromgovernmentstoproducers C.fromindividualstodistributors D.fromdistributorstogovernments 60.Whatdoesthepassagemainlytalkabout? A.Theincreaseine﹣waste. B.Thecreationofe﹣waste. C.Theseriousnessofe﹣waste. D.Themanagementofe﹣waste.
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FreedomandResponsibility Freedom'schallengeintheDigitalAgeisaserioustopic.Wearefacingtodayastrangenewworldandweareallwonderingwhatwearegoingtodowithit. Some2500yearsagoGreecediscoveredfreedom.Beforethattherewasnofreedom.Thereweregreatcivilizationssplendidempiresbutnofreedomanywhere.EgyptandBabylonwerebothtyranniesoneverypowerfulmanrulingoverhelplessmasses. InGreeceinAthens雅典alittlecityinalittlecountrytherewerenohelplessmasses.AndAthenianswillinglyobeyedthewrittenlawswhichtheythemselvespassedandtheunwrittenwhichmustbeobeyediffreemenlivetogether.Theymustshoweachotherkindnessandpityandthemanyqualitieswithoutwhichlifewouldbeverypainfulunlessonechosetolivealoneinthedesert.TheAtheniansneverthoughtthatamanwasfreeifhecoulddowhathewanted.Amanwasfreeifhewasself﹣controlled.Tomakeyourselfobeywhatyouapprovedwasfreedom.Theyweresavedfromlookingattheirlivesastheirownprivateaffair.EachonefeltresponsibleforthewelfareofAthensnotbecauseitwasforcedonhimfromtheoutsidebutbecausethecitywashisprideandhissafety.Theessentialbeliefofthefirstfreegovernmentintheworldwaslibertyforallmenwhocouldcontrolthemselvesandwouldtakeresponsibilityforthestate. Butdiscoveringfreedomisnotlikediscoveringcomputers.Itcannotbediscoveredonceforall.Ifpeopledonotprizeitandworkforititwillgo.Constantwatchisitsprice.Athenschanged.Itwasachangethattookplacewithoutbeingnoticedthoughitwasoftheextremeimportanceaspiritualchangewhichaffectedthewholestate.IthadbeentheAtheniansprideandjoytogivetotheircity.Thattheycouldgetmaterialbenefitsfromherneverenteredtheirminds.Therehadtobeacompletechangeofattitudebeforetheycouldlookatthecityasanemployerwhopaidhercitizensfordoingherwork.Nowinsteadofmengivingtothestatethestatewastogivetothem.Whatthepeoplewantedwasagovernmentwhichwouldprovideacomfortablelifeforthemandwiththisastheprimaryobjectideasoffreedomandself﹣relianceandresponsibilitywereneglectedtothepointofdisappearing.Athenswasmoreandmorelookedonasacooperativebusinesspossessedofgreatwealthinwhichallcitizenshadarighttoshare. Athensreachedthepointwhenthefreedomshereallywantedwasfreedomfromresponsibility.Therecouldbeonlyoneresult.Ifmeninsistedonbeingfreefromtheburdenofself﹣dependenceandresponsibilityforthecommongoodtheywouldceasetobefree.Responsibilityisthepriceeverymanmustpayforfreedom.Itistobehadonnootherterms.AthenstheAthensofAncientGreecerefusedresponsibilityshereachedtheendoffreedomandwasnevertohaveitagain. ButtheexcellentbecomesthepermanentAristotlesaid.Athenslostfreedomforeverbutfreedomwasnotlostforeverfortheworld.AgreatAmericanJamesMadisonreferredtoThecapacity能力ofmankindforself﹣government.NodoubthehadnotanideathathewasspeakingGreek.Athenswasnotinthefarthestbackgroundofhismindbutoncemanhasagreatandgoodideaitisnevercompletelylost.TheDigitalAgecannotdestroyit.Somehowinthisorthatman'sthoughtsuchanidealivesthoughunconsideredbytheworldofaction.Onecanneverbesurethatitisnotonthepointofbreakingoutintoactiononlysurethatitwilldososometime. 65.WhatdoestheunderlinedwordtyranniesinParagraph2referto? A.Countrieswheretheirpeopleneedhelp. B.Powerfulstateswithhighercivilization. C.Splendidempireswherepeopleenjoyfreedom. D.Governmentsruledwithabsolutepower. 66.Peoplebelievinginfreedomarethosewho. A.regardtheirlifeastheirownbusiness B.seekgainsastheirprimaryobject C.behavewithinthelawsandvaluesystems D.treatotherswithkindnessandpity 67.WhatchangeinattitudetookplaceinAthens? A.TheAtheniansrefusedtotaketheirresponsibility. B.TheAtheniansnolongertookprideinthecity. C.TheAtheniansbenefitedspirituallyfromthegovernment. D.TheAthenianslookedonthegovernmentasabusiness. 68.WhatdoesthesentenceTherecouldbeonlyoneresult.inParagraph5mean? A.Athenswouldcontinuetobefree. B.Athenswouldceasetohavefreedom. C.Freedomwouldcomefromresponsibility. D.FreedomwouldstopAthensfromself﹣dependence. 69.WhydoestheauthorrefertoAristotleandMadison? A.Theauthorishopefulaboutfreedom. B.Theauthoriscautiousaboutself﹣government. C.TheauthorisskepticalofGreekcivilization. D.Theauthorisproudofman'scapacity. 70.Whatistheauthor'sunderstandingoffreedom? A.Freedomcanbemorepopularinthedigitalage. B.Freedommaycometoanendinthedigitalage. C.Freedomshouldhavepriorityoverresponsibility. D.Freedomneedstobeguaranteedbyresponsibility.
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IwasrequiredtoreadoneofBernieSiegel'sbooksincollegeandwashookedonhispositivityfromthatmomenton.Thestoriesofhisunconventional36andtheexceptionalpatientshewroteaboutwereso37tomeandhadsuchabig38onhowIsawlifefromthenon.WhoknewthatsomanyyearslaterIwouldlooktoDr.BernieandhisCDsagainto39myowncancerexperience? I'manambitious40andwhenIstartedgoingthroughchemo化疗eventhoughI'mavery41personIlostmydrivetowrite.Iwasjusttootiredandnotinthe42.Onedaywhilewaitingtogoinfor43IhadoneofDr.Bernie'sbooksinmyhand.Anotherpatient44whatIwasreadingandstruckupaconversationwithme45hehadoneofhisbookswithhimaswell.It46thatamongotherthingshewasaneighty﹣year﹣oldwriter.Hewas47apublishedauthorandhewascurrently48onanewbook. Wewouldseeeachotheratvarioustimesand49friends.SometimesheworeaduckhatandIwouldtellmyselfhewasdefinitelyan50ofDr.Bernie.Hereallyputa51onmyface.Heunfortunately52lastyearduetohiscancer53heleftadeepimpressiononmeandgavemethe54topickupmypenagain.I55tomyselfIfhecandoitthensocanI. 36.A.tastes B.ideas C.notes D.memories 37.A.amazing B.shocking C.amusing D.strange 38.A.strike B.push C.challenge D.impact 39.A.learnfrom B.goover C.getthrough D.referto 40.A.reader B.writer C.editor D.doctor 41.A.positive B.agreeable C.humorous D.honest 42.A.mood B.position C.state D.way 43.A.advice B.reference C.protection D.treatment 44.A.viewed B.knew C.noticed D.wondered 45.A.while B.because C.although D.providing 46.A.cameout B.workedout C.provedout D.turnedout 47.A.naturally B.merely C.hopefully D.actually 48.A.deciding B.investing C.working D.relying 49.A.became B.helped C.missed D.visited 50.A.patient B.operator C.fan D.publisher 51.A.sign B.smile C.mark D.mask 52.A.showedup B.setoff C.felldown D.passedaway 53.A.since B.but C.so D.for 54.A.guidance B.trust C.opportunity D.inspiration 55.A.promised B.swore C.thought D.replied
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如图半径为a的内圆A是电子发射器其金属圆周表圆各处可沿纸面内的任意方向发射速率为v的电子外圆C为与A同心的金属网半径为a.不考虑静电感应及电子的重力和电子间的相互作用已知电子质量为m电量为e. 1为使电子从C射出的速率达到3vCA间应加多大的电压U 2CA间不加电压而加垂直于纸面向里的匀强磁场. ①若沿A径向射出的电子恰好不从C射出求该电子第一次回到A时在磁场中运动的时间t ②为使所有电子都不从C射出所加磁场磁感应强度B应多大.
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