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一个圆锥被过顶点的平面截去了较小的一部分,余下的几何体的三视图如图,则该几何体的体积为 .
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高一上学期数学《》真题及答案
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Nowadaysmostofusliveabusylife.Whatdoyoudotokeepyourselfrelaxed?Besidesspendingtimewithfamilyhavingaglassofwinewithfriendsorreadingabookhowaboutahobby? PersonallyI'macollector.Ilikeblueandwhitepiecesbest﹣﹣﹣blueandwhiteanything!Platesjarsvasescupsbowls﹣﹣﹣Ilovethemall.Collectingitemsislikesomethingyoucan'tgetenoughof.Yougetoneandyouwanttohavemore. Ifindcollectingtobeafunandinspirational鼓舞人心的hobby.Inmanywaysit'slikeapuzzleI'mnevertiredofsolving.Ilookfornewpiecestoaddtomycollection.IcanoftenbefoundvisitingMarshell'slookingovertheirinexpensiveofferings.InfactIfoundoneofmyfavoritepiecesthere. I'vemixedinexpensivepiecesfromMarshell'swithmoreexpensivefinds.Alotoftimesit'sthepieceI'mnotlookingforthatfallsintomylapIfindawaytomakeitpartofmyblueandwhitefamily.WhatIloveaboutmycollectionisthatwhenIgetinspiredIcanmovethemaroundthehousemixandmatchandmakethingslookfreshandnew. EversinceIwasalittlegirlbluehasbeenmyfavoritecolor.IthinkIgotitfrommyauntinMexico.SomeofmyearliestmemoriesarevisitingherinMexicoandsittingonachairinherkitchenwhichhadblueandwhitetiles瓷砖fromthefloortotheceiling.Iwouldspendcountlesshoursadmiringallthebeautifulblueandwhiteplatesandshinybluetilesaroundherkitchen.OnceIhadahomeIbegantobuildmyownblueandwhitecollection. 32.Wecaninferthatinthewriter'sopinion. A.havingahobbycanhelpusrelax B.readingabookaloneisreallyboring C.keepingahobbyisnoteasyformostofpeople D.havingaglassofwinewithfriendsisnotagoodidea 33.WhatdoestheunderlinedsentenceinParagraph2probablymean? A.Collectingthingsrequiresalotofmoney. B.Peoplealwayswantmorethantheyneed. C.Onceyoustartcollectingthingsit'shardtostop. D.Peoplemaynotknowwhattheywanttocollect. 34.Ifsomethingfallsintoyourlapitmeansyou. A.havebeenlookingforitB.getitunexpectedly C.don'tknowwhatitisD.likeitverymuch 35.What'sthelastparagraphmainlyabout? A.Whenthewriterstartedcollectingthings. B.Whythewriterlikedheraunt'sthingssomuch. C.Whatkindofthingthewritercollectedfirst. D.Whenthewriterstartedlikingbluethings.
Asback﹣to﹣schoolshoppingisunderwaytensofmillionsofcollegestudentshavebecomethebuyingforceintheexpandingshoppingmarketespeciallytheonlineone.Forexampleasenioruniversitystudent﹣﹣﹣﹣LiuYangrecentlyboughtanewiPhone6sfromane﹣shop.Ineedtobepreparedforthenewlife.Andabrandnewsmartphonewillbeausefultoolformynextjourneylikelookingforjobssaidthe22﹣year﹣oldLiu. Asanactiveparticipantintheback﹣to﹣schoolshoppingseasonsomee﹣commerceplatformshavebecomethemainbattlefieldforonlineshopping.Oneplatformlaunchedaone﹣monthpromotionalfestivalincludingcellphonesdigitalproductscomputerofficesuppliesbooksaudioandvideoproductsplusitemsfortravelanddailylife.Otheronlineplatformsalsoofferpromotionalactivitiessuchasprovidingdiscounts折扣orfreemaintenanceforthepurchasedgoods. Accordingtooneplatform'sstatisticsduringits618onlineshoppingfestivalthenumberofboughtgoodsbycollegestudentsonitse﹣shopgrewby300%fromlastyear.Thedatashowthatcollegestudentsprefertobuythingsinthecategoriesofbeautyandhealthfoodanddrinkscomputerofficesuppliesbooksandmobilephones. XiangLigangtelecomexpertandCEOoftheindustrywebsitecctime.Comsaidthatthenexttwomonthsarepeakseasonsforsalesandthetotalsalesforcellphonesandcomputerswillgrowhigherduringthattimeduetotheback﹣to﹣schoolspending. 24.WhydoesLiuYangbuyaniPhonefromonlineplatform? A.Becausesheexpectstoshowheradvantageoverothers B.Becauseshewantstobebetterpreparedforthefuturelife. C.Becauseshewishestosavemoneyforthecomingterm. D.Becauseshedesirestoincreasetheonlineshoppingmarket. 25.Whatcan'tbeboughtinthispromotionalfestival? A.ConcertticketsB.BooksC.iPhonesD.Videoproducts 26.AccordingtoParagraph3ifthenumberofboughtgoodsbycollegestudentswas26000lastyearwhatisthefigureofthisyear? A.130000B.104000C.180000D.208000 27.Whatisthemainideaofthispassage? A.OnlineshoppingfestivalB.Anewwayoflifeisontheway C.ChallengesforcollegestudentsD.Schoolreturnleadstoshoppingincrease.
2019年1月3日10时26分嫦娥四号探测器自主着陆在月球背面南极一艾特肯盆地内的冯卡门撞击坑内实现人类探测器首次月背软着陆.为了能在地面上接收到嫦娥四号的信号我国发射“鹊桥”号中继星在地月拉格朗日L2点简称地月L2点上运行这是世界首颗运行于地月拉格朗日2点的通信卫星.地月L2点是卫星相对于地球和月球基本保持静止的一个空间点即地月拉格朗日L2点与月球地球总在同一直线上并且处在月球背面如图所示.处在地月拉格朗日L2点的“鹊桥”号中继星绕地球运行时
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设函数已知曲线y=fx在x=0处的切线l方程为y=kx+b且k≥b. 1求m的取值范围 2当x≥﹣2时fx≥0求m的最大值.
EveryFridayIgotoCantataAdultLifeServicealocalretirementcommunitywithmyclassmatestodocommunityservice. Ourvisitslastaboutanhourplayinggamesandcardswiththepeople41wearethere. YoucanwatchallthemoviesandTVshowsyouwantaboutlifebackthenbutnothing42withtalkingtothepeoplewhowereactuallythere.Justhearingtheirstorieshas43meinawayIneverthoughtpossible. Whetheritwastalkingto98﹣year﹣oldHurricaneHildaaboutherglorydays44 arollerskaterorchattingwithLouaboutthetimesshedancedwithafamousactorIwascompletelyimpressedbyeverysingle45thepeoplewantedtosharewithme. Eventhepeoplewhodon'thave46memoriesmaketheexperiencecolorful.IremembervisitingMrs.Robinson.Shecouldn't47muchaboutherpastbutshetoldmeshe'd48forgethowkindIwasjusttolistentoher.Itmademerealizethatitisthe49thingsthatmakelifeworthliving.ThatissomethingIwon't50anytime. IfthereisonethingIhaverealizedinmythreeyearsofvisitingCantataitis51 ﹣﹣﹣﹣﹣justbeingthere﹣﹣﹣﹣thatmeansmorethananythingtomanyofthepeople.Anddespitehow52ourlivesarethereisalwaystimetomakethemhappy. Formeitfeelsgreattobea53ofhappinessasmileonabaddayoran54 foroldmemories.Andattheendofthedaythatisallthat55. It'seasytofeellikeyoudon'thavemuchincommonwiththe56﹣﹣especiallywhenyouarean57.Butthatisnottrueatall. Ihatetomakemuchcommentherebutagereallyisjustan58.Asyoungadultsitisimportantforustorealizethissooner59later.Wecanlearnalotfromtheelderlyandtheycanoften60fromteenagerstoo. 41.A.until B.unless C.while D.before 42.A.compares B.complete C.combines D.connects 43.A.touched B.reached C.pretended D.understood 44.A.like B.as C.about D.towards 45.A.imagination B.truth C.picture D.memory 46.A.boring B.depressing C.amazing D.tiring 47.A.concern B.take C.recall D.mention 48.A.ever B.always C.even D.never 49.A.important B.little C.major D.sweet 50.A.care B.skip C.believe D.forget 51.A.presence B.apology C.understanding D.protection 52.Amessy B.happy C.easy D.busy 53.A.risk B.chance C.source D.cause 54.A.mind B.ear C.tongue D.heart 55.A.matters B.favors C.differs D.exists 56.A.friendly B.lively C.lonely D.elderly 57.A.adult B.teenager C.people D.child 58.A.amount B.difference C.advantage D.number 59.A.orelse B.ratherthan C.otherthan D.exceptfor 60.A.hear Bdiffer C.judge D.benefit
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函数的定义域为
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复数=
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在区间[﹣23]上随机选取一个数X则X≤1的概率为.
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对于函数fx若存在x∈R使fx0=x0成立则称x0为fx的不动点.已知函数fx=ax2+b+1x+b﹣1a≠0. 1当a=1b=2时求函数fx的不动点 2若对任意实数b函数fx恒有两个相异的不动点求a的取值范围 3在2的条件下若fx的两个不动点为x1x2且fx1+x2=求实数b的取值范围.
函数的零点所在区间是
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