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已知函数(k≥0). (1)当时,判断函数f(x)的单调性; (2)证明:函数f(x)恰有一个零点.
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高三下学期数学《》真题及答案
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7.5分Thisactivitywillmeltawaythepoundsbuildyourbodyandleaveyouonanemotionalhigh.Yettheformofexercisethefitnesstrendoftheyeardoesnotrequiregymmembershiporapersonaltrainer.Allyouneedtodoiswalk. Walkingisarefreshingalternativetocomplicatedaerobic氧routinesandoverpricedgymmembershipsayspersonaltrainerLucyKnightauthorofanewbookontheexercise.Itisfreeenjoyableandalreadyapartofeverydaylife.Allyouneedtodoiscorrectyourtechniquewalkfasterandforlongerandyouwillloseweight. Thereismuchevidenceofthebenefitsofwalking.ScientistsattheUniversityofPittsburghrecentlydiscoveredthatoverweightpeoplewhowalkedbriskly快for30to60minutesadaylostweighteveniftheydidn'tchangeanyotherlifestylehabits.AnotherAmericanstudyfoundthatpeoplewhowalkedforatleastfourhoursaweekgainedlessweightthancouchpotatoesastheygotolder.ResearchersattheUniversityofMassachusettsmedicalschoolfoundthatpeoplewhowalkedeverydayhad25percentfewercoldsthanthosewhosatalot.Bestofallwalkingmakesyoufeelgoodaboutyourself.Forpeoplesufferingfromdepressionwalkingthreetofourtimesaweekfor30minuteshasbeenshowntolifttheirmoodsaysKnight. ButhowtowalkyourwaytoweightlossandwellnessHealthexpertsrecommendthatweshouldwalk10000stepsadaytostayhealthy.Actuallyyouwouldprobablyneedtowalkatleast16000stepsadaytoloseweight.Yourworkoutplansdependonyourleveloffitness.Youshouldaimtoprogressbyincreasingyourwalkingtimebyfiveminuteseverytwoweeksandwalkabitfaster.InjustthreemonthstheresultsshouldspeakforthemselvessaysKnight. 1Whatisthelatestfitnesstrendaccordingtothepassage A.Briskwalking. B.Losingweight. C.Workingoutinagym. D.Exercisingwithapersonaltrainer. 2Studiesandresearchesarementionedinthepassagetoshowwalking. A.isgainingincreasingpopularity B.benefitspeopleindifferentaspects C.isanenjoyablewaytoloseweight D.involvesdifferentgroupsofpeople 3Itcanbelearnedfromthelastparagraphthat. A.1600stepsadayisneededforweightlosses B.theeffectofwalkingisnoticeableovertime C.yourfitnessleveldependsonyourhealthexperts D.changingthewalkingtimeeverydayisnecessary
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WhenIwas16IreadamagazinearticleaboutamuseumcalledtheMcKayoncethehomeofawatercoloristnamedMarianMcKay.Shehadrequestedthecommunitytoturnitintoamuseumuponherdeath.OnasunnySaturdaySallyandIdroveovertothemuseum.SheaskedDoyouhavetheaddressNobutI'llrecognizeittherewasapictureinthemagazine. Ohstop.Thereitis! Themuseumwasfree.Weenteredexcited.Agroupofpeoplesittinginthehallstoppedtalkingandstaredatus. MayIhelpyouamanasked.NoIsaid.We'refine.Tourguidesgotonmynerves.Whatiftheytalkedalongtimeaboutapaintingyouweren'tthatinterestedinSallyhadgoneupstairs.Thepeopleinthehallseemedverynosy爱窥探的keepingtheireyesonmewithcuriosity.WhatwastheirproblemIsawsomenicesculpturesinoneroom.SuddenlyIsensedamanstandingbehindme.Wheredoyouthinkyouareheasked.Iturnedsharply.TheMckayArtMuseum!Hesmiledshakinghishead.SorrytheMckayisonNewBraunfelsStreet.What'sthisplaceIaskedstillconfused.Wellit'sourhome.Myheartjolted震颤.IracedtothestaircaseandcalledoutSally!Comedownimmediately! There'ssomereallygoodstuffupthere.Shesteppeddownlookingconfused.IpushedhertowardthefrontdoorwavingatthefamilysayingSorrypleaseforgiveusyouhaveareallyniceplace.OutsidewhenItoldSallywhathappenedshecoveredhermouthlaughing.Shecouldn'tbelievehowlongtheyletuslookaroundwithoutsayinganything. TherealMcKaywassplendidbutwefeltnervousthewholetimewewerethere.VanGoghPicasso.Thistimewestayedtogetherincaseanythingelseunusualhappened. Thirtyyearslaterawomanapproachedmeinapublicplace.ExcusemedidyoueverenteraresidencelongagothinkingitwastheMcKayMuseum Yes.ButhowdoyouknowWenevertoldanyone. Thatwasmyhome.Iwasateenagersittinginthehall.BeforeyoucameoverIneverrealizedwhatabeautifulplaceIlivedin.Ineverfeltluckybefore.Youthoughtitwasamuseum.Myfeelingsaboutmyhomechangedafterthat.I'vealwayswantedtothankyou. 1Howdidtheauthorfeelaboutbeingstaredatbythepeopleinthehall A.Concerned. B.Frightened. C.Puzzled. D.Delighted. 2Whydidtheauthorrefusethehelpfromthemaninthehouse A.Shedislikedpeoplewhowerenosy. B.Shefeltnervouswhentalkingtostrangers. C.Sheknewmoreaboutartthantheman. D.Shemistookhimforatourguide. 3WhydidtheauthordescribetherealMcKaymuseuminjustafewwords A.Therealmuseumlackedenoughartworktointeresther. B.Shewastooupsettospendmuchtimeattherealmuseum. C.TheMcKaywasdisappointingcomparedwiththehouse. D.Theeventhappeninginthehousewasmoresignificant. 4Whatcouldwelearnfromthelastparagraph A.Peopleshouldhavegoodtastetoenjoylife. B.Peopleshouldspendmoretimewiththeirfamily. C.Peopletendtobeblindtothebeautyaroundthem. D.Peopletendtoeducateteenagersatamuseum.
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阅读下面短文根据其内容写一篇60词左右的内容概要. NowadaysanincreasingnumberofyoungChinesespendmoneybecausetheyarelazy.AccordingtoareportissuedinDecemberbyChina'se﹣commerceplatformTaobaoonChina'slazyeconomyChinesepeoplespent16billionyuanonproductsandservicesonlinein2018.Thepost﹣1995generationwasthelaziestasitsconsumptionincreasedby82percentcomparedwiththatin2017. Theso﹣calledlazyeconomyreferstoanewtypeofconsumptionofproductsandserviceswhicharedesignedtosavetimeandlabor.Accordingtothereportmanypeopleofthepost﹣1995generationbuyhigh﹣techelectronicdevicessuchasfloormoppingrobotsandautomaticwindowcleanerswhichsavethetroubleofdoinghouseholdchores.Meanwhiletake﹣outfooddeliveryservicesarealsopopularamongpeoplebomafter1995. Youngpeoplearewillingtospendmoneyonsuchproductsbecausetheywanttoenjoyhard﹣earnedleisuretimeafterabusyandstressfuldayatworkorschoolreportedGlobalTimes.Becausetheyneedtofocusontheirstudiesorjobstheseso﹣calledlazypeopletendtousetheirleisuretimemoreefficiently.ForexampleWeiDuoa21﹣year﹣oldcollegestudentisafrequentuseroftake﹣outfooddeliveryservices.Ioncehadabirthdaycakedeliveredtomyfriendwholivesfarfrommyhome.Itcostme50yuanbutitsavedmealmosthalfadaythatwouldhavebeenneededtodeliveritmyself.Myfriendwasalsohappybecauseshegottocatthecakeinstantly''WeitoldtheGlobalTimes. Whilethelazyeconomymightbeconvenientforyoungpeopleitmightalsocreateproblems.The‘lazyeconomy'oncampusisexpressedinthingslikepeoplebuyingfoodorotherthingswithoutleavingthedormitory.Asaresulttheystayintheirdormitoriesalldaylongplayingoncomputersandsmartphones.AccordingtoJinanDailythissituationcouldleadtoyoungpeoplebecominglesssociableandevendevelopingproblemsofcommunicatingwithothers.Youngpeopleshouldbealert努觉的toit.
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如图所示是某餐厅出现的一款餐饮机器人可以为客人送上凉菜主食等. 1送餐时机器人在1min内沿直线匀速移动了15m此过程中机器人运动的速度是多少m/s 2机器人送餐时总质量为42kg它与水平地面接触的总面积为100cm2则它对地面的压强是多少g取10N/kg
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