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已知a>0,b>0,c>0,函数f(x)=|x+a|+|x﹣b|+c的最小值为4. (Ⅰ)求a+b+c的值; (Ⅱ)求a2+b2+c2的最小值.
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高三下学期数学《》真题及答案
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设函数fx在[0+∞]上连续且f0>0已知在[0x]上的平均值等于f0与fx的几何平均值求fx.
已知函数fx的定义域为-∞0∪0+∞fx是奇函数且当x>0时fx=x2-x+a若函数gx=fx-x的
a<0
a≤0
a≤1
a≤0或a=1
已知奇函数fx的定义域为R.其导函数为f′x当x>0时xf′x﹣fx<0且f﹣1=0则使得fx<0成
(﹣1,0)∪(1,+∞)
(﹣∞,1)∪(0,1)
(0,1)∪(1,+∞)
(﹣∞,﹣1)∪(﹣1,0)
已知奇函数fx的定义域为-∞0∪0+∞且fx在0+∞上是增函数f1=0.1求证函数fx在-∞0上是增
已知f′x是奇函数fx的导函数f﹣1=0当x>0时xf′x﹣fx>0则使得fx>0成立的x的取值范围
(﹣∞,﹣1)∪(0,1)
(﹣1,0)∪(1,+∞)
(﹣1,0)∪(0,1)
(﹣∞,﹣1)∪(1,+∞)
已知函数fx=|x|x∈R则fx是
偶函数且在(0,+∞)上单调递增
奇函数且在(0,+∞)上单调递减
奇函数且在(0,+∞)上单调递增
偶函数且在(0,+∞)上单调递减
已知函数fx是﹣∞0∪0+∞上的奇函数当x>0时fx=﹣+11当x<0时求函数fx的解析式2证明函数
已知函数fx是R.上的偶函数且在0+∞上有f′x>0若f-1=0那么关于x的不等式xfx
已知函数y=fx那么下列说法错误的是
Δy=f(x
0
+Δx)-f(x
0
)是函数值的增量
叫做函数在x
0
到x
0
+Δx之间的平均变化率
f(x)在x
0
处的导数记为y′
f(x)在x
0
处的导数记为f′(x
0
)
已知fx=logax+1a>0且a≠1若当x∈-10时fx
增函数
减函数
常数函数
不单调的函数
已知二次函数fx满足f2+x=f2-x且fx在[02]上是增函数若fa≥f0则实数a的取值范围是
[0,+∞)
(-∞,0]
(-∞,0]∪[4,+∞)
[0,4]
已知fx是R.上的偶函数且在[0+∞上是减函数fa=0a>0那么不等式xfx
{x|0
{x|-a
a}
{x|-a
{x|x<-a或0
设fx是定义域为R.的偶函数且对任意实数x恒有fx+1=﹣fx已知x∈01时fx=1﹣x则函数fx在
是增函数,且f(x)<0
是增函数,且f(x)>0
是减函数,且f(x)<0
是减函数,且f(x)>0
已知函数fx=loga|x+1|在-10上有fx>0则fx
在(-∞,0)上是增函数
在(-∞,0)上是减函数
在(-∞,-1)上是增函数
在(-∞,-1)上是减函数
给出下列四个命题其中正确命题的序号是①已知fx=x2+bx+c是偶函数则b=0②若函数fx的值域为[
①②⑤
①②④⑤
①②③⑤
①③④⑤
设函数fx在[0+∞]上连续且f0>0已知其在[0x]上的平均值等于f0与fx的几何平均值求fx.
设函数fx在[0+∞]上连续且f0>0已知其在[0x]上的平均值等于f0与fx的几何平均值求fx
已知函数fx是﹣∞0∪0+∞上的奇函数当x>0时fx=﹣+11当x<0时求函数fx的解析式2证明函数
若函数fx对定义域中任意x均满足fx+f2a﹣x=2b则函数fx的图象关于点ab对称.1已知函数fx
已知函数fx=xα当x∈1+∞时fx-x
0<α<1
α<1
α>0
α<0
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一个圆锥形沙堆底面直径是6米高是2.5米.用一辆载重8吨的汽车运几次可以运完每立方米的沙重1.8吨得数保留整数.
DirectionsReadthefollowingpassage.Summarizethemainideaandthemainpointsofthepassageinnomorethan60words.Useyourownwordsasfaraspossible.LonelinessPeaksForyearsAmericahasbeentalkingaboutobesitybutanewstudypointstoamoreserioushealthissueisolationandloneliness.Beingconnectedtootherssociallyiswidelyconsideredafundamentalhumanneed﹣crucialtobothwell﹣beingandsurvival.Extremeexamplesshowinfantswholackhumancontactincarefailtogrowandoftendie.Indeedsocialisolationhasbeenusedasaformofpunishment.AccordingtoJulianneHolt﹣LunstadtheleadauthorofthestudyanincreasingportionoftheU.S.populationnowexperiencesisolationregularly.Over42millionadultsaboveage45intheU.S.areestimatedtobesufferingfromchronic长期的loneliness.Thestudyof340adultsbetweentheagesof27and101livinginSanDiegoidentifiedthreekeyagerangeswhenpeoplefelttheloneliest.Participantswhohadthehighestlevelsoflonelinesswereintheirlate﹣20smid﹣50sandlate﹣80s.Whileitmaycomeasasurprisethatpeopleintheirlate﹣20ssufferedfromlonelinessalargersurveyshowstheyactuallymaysufferthehardest.Withanincreasingnumberofpeopleworkingfromhomewatchingtelevisiongettingintoanaddictiontoelectronicdevicesithasbecometooeasytobealoneevenifthat'snotaperson'sintention.Moderndayconvenienceslikehavinganythingwewantdeliveredmakeitpossibletoneverneedtoleavethehouse.Sonotsurprisinglythosewithfrequentsocialcontactusuallyfeellesslonelythanthosewithfewsocialties.Mountingevidencesuggestssocialisolationandlonelinesssignificantlyimpactourhealthandevenshortenourlivesjustlikeobesity.Thisstudyisn'tthefirsttimelonelinesshasbeenflaggedasanemerginghealthissue.Thereforereducingbothisolationandlonelinessisimportantforqualityoflifeandwell﹣being.
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.
修一条公路已经修了全长的离中点还有7千米这条公路全长多少千米
比的前项不能是0.判断题
暴饮暴食被一些人认为是缓解工作压力的手段.regard
Whilefakingandfiercelooksareamonganimalsgreatdefensesmanyspeciesknowthateveryonerunsfromabigstink臭气too. Vulture秃鸳 Vulturesarestreetsweepersthatfeastontherottingfleshofdeadanimalswhichbenefitsusbyriddingourhighwaysandlandscapesofanimalbodiesandthebacteriatheymightcarry.Whenvulturesfeelthreatenedtheyvomitandthesmellofvomited—ondeadbodiesputsofmostpredators.Throwingupallowsthevulturetoflyawaymorequickly—andthevomitcanhurttheaggressor'seyesandface. Opossum负鼠 Insomewaysopossumshaveiteasy.Inordertobecomedeadtheydon'thavetofaxanyoneadeathcertificate.Theyjustlietherewiththeirtongueshangingoutwiththesmellofdeadfleshsometimesforhourseffectivelyconvincingpotentialpredatorstheycanfindamuchfreshermealelsewhere.Eveniftheykeepgettingattackedtheywon'tmoveanymorethanahumanstatueuntilthethreathaspassed. Hoatzin磨雉 Holdyournoseandmeetthehoatzinabirdofdistinctionsnottheleastofwhichisthatitsmellslikefreshcowshit.Theanimalmostlyeatsleavesandit'stheonlybirdknowntodigestbyfermentationlikeacow.Thisprocessiswhatcausesitssmellandhasearneditthenicknamethestinkbird. Millipedes千足虫 Millipedesaretricky.Forstarterstheylookwormy.TheirnameisdeceptivetooTheirlegsnumberabout750.Theirmajordefenseistocurlupintoaball.Theythoughalsoreleaseaharmeyesandleaveahorriblesmellontheirattackers. SeaHare海兔 Thegracefulseahareisplainintasteinthefirstplacesoit'snotthemostpopulardishintheseafoodchain.Nonethelessthistypeofseacreaturehasaprettycreativesmell—relateddefensethatisalmosttheoppositeofitssmellycompanionsonthislist.Theseaharegivesoutaslimypurpleinkthesubstancewhichmakesfoodlesspalatabletopredators. Researchersusinglobsters2—fasmodelpredatorsfoundthattheseablocksthelobstersreceptivemechanism.Inotherwordstheseaharegivesitsattackertheequivalentofastuffynosesotheydon'tknowhowappealingitis. 1Theseaharedefendsitselffrompredatorsby. A.becomingplainintasteatthediscoveryofapredator B.givingoutpurpleinktomakeitselfinvisibletopredators C.releasingsubstancetomakepredatorsunabletosmellit D.givingoffsmellygastotrytodrivepredatorsaway. 2WhichofthefollowingstatementsisTRUEaccordingtothepassage? A.Thevulturecarriesbacteriasothatpredatorsdarenotgetclosetoit. B.Theopossumfakesitsdeathtoavoidbeingtargetedbypredators. C.Thehoatzineatscowshitsothatitisnick—namedasstinkbird D.Thegasreleasedbymillipedewasbasicallyharmless 3Thespeciesthatenjoysmorethanonedefensemechanismis A.vulture B.opossum C.millipede D.seahare
A.Theanimalstosomeextentbecometoolstous. B.Althoughviolenceagainstzooanimalsisoftenreportedtheissueofanimalwelfarehasarousedlittleattentionrecently. C.Bytakingaselfieyoushowthatyou'repartofthatexperience. D.Thecomparisonbetweencagedanimalsandwildonesareappealingtopeople. E.Similarincidentsarearegularoccurrenceinnaturalsettings. F.Thecommonfactoristhatsomepeoplearenotrespectinganimal. Recentlyinthequestforaselfie自拍awomanclimbedovertheconcretebarrierofaJaguar美洲虎enclosureatWildlifeWorldZooArizona.Thejaguarrippedintoherarm.Bystanderspulledherawaybeforetheanimalcouldinjureherfurther.She'sfine—soisthejaguar. Thisisn'tthefirsttimeastoryofapersonactingrudelytogetclosetoawildanimalmadeheadlines.Lastyear.amanjumpedintoalionenclosureatazooforaclose—upphoto.1MultipletouristsinYellowstoneNationalParkhavebeenattackedbybison野牛whenthey'vegottentoocloseforaphoto. It'scommonsensenottogetclosetowildanimalsthatcanhurtyou.It'swhyzooshavebarriers—sometimesmultiplewalls—tokeeppeopleseparatedfromanimals.Signspostedeverywherestatetheobviouswarning.Keepyourhandsoffthecage. Yetanimalshavebecomelessrealtoussaysanenvironmentalist.Weseeexoticanimalsmostfrequentlyinmanagedsettingslikezoos.2Peoplearetryingtotakeadvantageoftheirraritytoshowoffonsocialmediaandignoretheirfierceness. Mediaoftennormalizeinteractionwithdangerousanimals.SeeingamanlikeLionWhispererKevinRichardsonregularlyplay—fightwithlionsonTVmaysendthemessagethattheseanimalsaren'tsodangerousafterall. Socialmediaarealsoperfectlypositionedtocontributetotheriseofanimalselfies.Gettinglikesandcommentsprovideinstantsatisfaction.Yourself—esteemactuallygetsatemporaryboost.Toholdontothatfeelingpeoplemaygotomoreandmoreextremestoshowcasethemostexcitingversionsofthemselves.Itmaynotbeenoughtogetaphotoofabeautifuldangerousanimalfromoutsideacage.3 People'scarelessapproachcanputtheanimal'ssafetyatriskaswell.Zooanimalsoftenmustbekilledtoprotectthepersonwho'senteredtheirspace.Infactthrill—seekersactivelyendangerthelivesofanimals.4withthezooenvironmenttheytakeitforgrantedthatanimalsarethereforpeopleignoringthefactthatanimalsandhumansarebothequalexistentsinthenature.
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