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已知函数f(x)=ex(﹣x+lnx+a)(e为自然对数的底数,a为常数,且a≤1). (Ⅰ)判断函数f(x)在区间 (1,e)内是否存在极值点,并说明理由; (Ⅱ)若当a=ln2时,f(x)<...
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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=ex﹣ax﹣1e为自然对数的底数.Ⅰ求函数fx的单调区间Ⅱ当a>0时若fx≥0对任意的
已知函数fx=lnx+e-ax-b其中e为自然对数的底数.若不等式fx≤0恒成立则的最小值为.
已知函数fx=ax2+xex其中e为自然对数的底数a∈R..1当a02若fx在区间[-11]上是单调
已知函数fx=ex﹣xe为自然对数的底数1求函数fx在0f0处的切线方程2若对于任意的x∈02不等式
已知函数fx=ex﹣ax﹣1e为自然对数的底数a>0.1若a=1求函数fx在x=0处的切线方程2若f
已知函数fx的定义域是R.f′x是fx的导数f1=egx=f′x﹣fxg1=0gx的导数恒大于零函数
﹣1
0
1
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已知函数fx=ex﹣e﹣xe为自然对数的底则下列结论正确的是
f(x)为奇函数,且在R.上单调递增
f(x)为偶函数,且在R.上单调递增
f(x)为奇函数,且在R.上单调递减
f(x)为偶函数,且在R.上单调递减
已知函数fx=x﹣1﹣e﹣1lnx其中e为自然对数的底则满足fex<0的x的取值范围为
设函数fx=ex﹣ax2﹣ex+b其中e为自然对数的底数.SX030301Ⅰ若曲线fx在y轴上的截距
已知函数fx=-x2+2ex+t-1gx=x+x>0其中e表示自然对数的底数.1若gx=m有零点求m
已知函数fx=ax+1lnx﹣ax+3a∈R.gx是fx的导函数e为自然对数的底数.1讨论gx的单调
已知函数fx=k为常数e是自然对数的底数曲线y=fx在点1f1处的切线与x轴平行.1求k的值2求fx
已知函数fx=x-1-e-1lnx其中e为自然对数的底则满足fex<0的x的取值范围为.
设函数为自然对数的底数的图象与直线ex+y=0相切于点A.且点A.的横坐标为1.Ⅰ求ab的值Ⅱ求函数
已知定义在R.上的函数fx满足fx+f'x>1f0=4则不等式exfx>ex+3其中e为自然对数的底
已知ab为常数且a≠0函数e=2.71828是自然对数的底数.I.求实数b的值II求函数fx的单调区
已知函数fx=x﹣1+a∈Re为自然对数的底数.Ⅰ若曲线y=fx在点1f1处的切线平行于x轴求aⅡ求
已知函数fx=ex﹣ax﹣2e是自然对数的底数a∈R..1求函数fx的单调递增区间2若k为整数a=1
已知e是自然对数的底数函数fx=ex+x-2的零点为a函数gx=lnx+x-2的零点为b则下列不等式
f(a)
f(a)
f(1)
f(b)
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Whenyouhavegotalotofstuffdecluttering整理yourhomecanbereallynecessary.Declutteringisjustaboutputtingnewsystemsintoplaceinyourlife.1yourealizehowgreatyoufeelaboutitandyouwanttokeepgoing. Gettingridofthingsgivesyoutimetolookafteryourself.2orlookingforthepotatopeeler﹣becauseeverythinghasahomeandyouknowexactlywhereitis﹣you'refreetospendthattimeonyourselfandyourfamily.It'sliberating. 3.Ithastakenyoualongtimetogeteverythingandyouwon'tbeabletogetridofitallstraightaway.Ifyou'repushedfortimethereareeasywaysofintroducingdeclutteringintoyourlife.Spend10minutesadaydeclutteringorifthat'snotmanageabledeclutterthreeitemsaweek. Havethreepiles:oneforthingsyou'regoingtokeeponeforthingsthatareamaybeandoneforthingsyou'regoingtogiveaway.Youwillalsoneedsomebinbagsforrubbish.Arevisitingpileisimportantifyou'restrugglingtogetridofthings.4.MoreoftenthannotyouendupsayingactuallyIdon'tneedthat. Stayfocused.Peopleoftengetsidetrackedwhenthey'retryingtodeclutter.Theystarttryingonclothestheyhadforgottenaboutorlookingatoldphotos.Anothercommonmistakeistojustmovethingsfromplacetoplaceinsteadofgettingridofthem.5. A.Onceyoustartdecluttering B.Youneedtimetoreflectonwhattokeep C.Don'texpecttodecluttereverythingovernight D.Whenyou'renotalwayslookingforthescissors E.Ifyourealisethatyouownsixwineopenerskeeponlyone F.Startthedeclutteringprocessbeforeyoumoveinwithanewpartner G.Youcanjustleavethingsthereforafewweeksbeforeafinaldecision
已知曲线C1是以原点O为中心F1F2为焦点的椭圆曲线C2是以O为顶点F2为焦点的抛物线A是曲线C1与C2的交点且∠AF2F1为钝角若|AF1|=|AF2|=则△AF1F2的面积是
在平面直角坐标系xOy中直线l的普通方程是xsinα﹣ycosα=0<α<π曲线C1的参数方程是φ为参数在以O为极点x轴的正半轴为极轴建立的极坐标系中曲线C2的极坐标方程是ρ=2sinθ. 1写出1及C1的极坐标方程 2已知1与C1交于OM两点l与C2交于ON两点求|ON|2+|OM|的最大值.
Duringtherosyyearsofelementaryschool小学Ienjoyedsharingmydollsandjokeswhichallowedmetokeepmyhighsocialstatus.Iwasthequeenoftheplayground.Thencamemytweensandteensandmeangirlsandcoolkids.TheyroseintheranksnotbybeingfriendlybutbysmokingcigarettesbreakingrulesandplayingjokesonothersamongwhomIsoonfoundmyself.Popularityisawell﹣exploredsubjectinsocialpsychology.MitchPrinsteinaprofessorofclinicalpsychologysortsthepopularintotwocategories:thelikableandthestatusseekers.Thelikables'plays﹣well﹣with﹣othersqualitiesstrengthenschoolyardfriendshipsjump﹣startinterpersonalskillsandwhentappedearlyareemployedeverafterinlifeandwork.Thenthere'sthekindofpopularitythatappearsinadolescence:statusbornofpowerandevendishonorablebehavior.EnviableasthecoolkidsmayhaveseemedDr.Prinstein'sstudiesshowunpleasantconsequences.Thosewhowerehighestinstatusinhighschoolaswellasthoseleastlikedinelementaryschoolare'mostlikelytoengage从事indangerousandriskybehavior.'InonestudyDr.Prinsteinexaminedthetwotypesofpopularityin235adolescentsscoringtheleastlikedthemostlikedandthehighestinstatusbasedonstudentsurveys调查研究.'Wefoundthattheleastwell﹣likedteenshadbecomemoreaggressiveovertimetowardtheirclassmates.Butsohadthosewhowerehighinstatus.Itclearlyshowedthatwhilelikabilitycanleadtohealthyadjustmenthighstatushasjusttheoppositeeffectonus.'Dr.Prinsteinhasalsofoundthatthequalitiesthatmadetheneighborswantyouonaplaydate﹣sharingkindnessopenness﹣carryovertolateryearsandmakeyoubetterabletorelateandconnectwithothers.InanalyzinghisandotherresearchDr.Prinsteincametoanotherconclusion:Notonlyislikabilityrelatedtopositivelifeoutcomesbutitisalsoresponsibleforthoseoutcomestoo.'Beinglikedcreatesopportunitiesforlearningandfornewkindsoflifeexperiencesthathelpsomebodygainanadvantage'hesaid.1Whatsortofgirlwastheauthorinherearlyyearsofelementaryschool?A.Unkind.B.Lonely.C.Generous.D.Cool.2Whatisthesecondparagraphmainlyabout?A.Theclassificationofthepopular.B.Thecharacteristicsofadolescents.C.Theimportanceofinterpersonalskills.D.Thecausesofdishonorablebehavior.3WhatdidDr.Prinstein'sstudyfindaboutthemostlikedkids?A.Theyappearedtobeaggressive.B.Theytendedtobemoreadaptable.C.Theyenjoyedthehigheststatus.D.Theyperformedwellacademically.4Whatisthebesttitleforthetext?A.BeNice﹣YouWon'tFinishLastB.TheHighertheStatustheBetterC.BetheBest﹣YouCanMakeItD.MoreSelf﹣ControlLessAggressiveness
如图在棱长为2的正方体ABCD﹣A1B1C1D1中EFG分别是棱ABBCCC1的中点P是底面ABCD内一动点若直线D1P与平面EFG不存在公共点则三角形PBB1的面积的最小值为
Nowadayspeopletendtodigitaliseeverythingfromwatchestofridges.Itseemsyoucanchooseanyitemlabeledassmart.1Howeverthereareplentythatcanbeusedtoreduceemissionsandsavemoney. Ifyou'reapartofthedigitalisationmovementyoumightbeinterestedintheconceptofsmarthomes.Itmeansthateveryelementofyourhousecanbecontrolledfromapanelonthewalloryourphone.2Useyourmobiletopowerthemonoroffandyoumayfeeltrulymodernortrulylazy.Asidesfromthebenefitsoflivingamorecomfortablelifethispresentsanopportunitytocutdownonyourelectricalbills. Electricitygenerationtodayrepresents31%oftotalglobalfossilfueluseandaround40%ofallenergy﹣relatedCO2emissions.3Itisconsideredasthefirststeptopreventglobalclimatechange.Connectasmartthermometertotheheatingandcoolingsystemandsetaspecifictemperatureatwhichtheheatingbeginstowork.Doingsotheroomwillbeatadesiredtemperaturewhennecessaryandswitchesonapower﹣savingmodewhennotoccupied.SimilarlybyinstallingaCO2sensoryoucanhaveanautomatedventilation通风system.4 Ina150000m2officecomplexnearMunichcalledCampeonenergycostsofupto117067Euroweresavedaftertheuseofenvironmentalcontroldevicesthisyear.InthiswaytheyarecontributingtoalargedecreaseinCO2emissions.Clearlysmarthomesareaboutmuchmorethanjustlivingacomfortablelife.5 A.Itisactuallyaboutlivingagreenlife. B.Smartdeviceshavebeeninstalledworldwidenowadays. C.ItstartsworkingonlywhenCO2concentrationsreachacertainlimit. D.Thereseemtobeanoceanofsuchso﹣calledsmartinventions. E.Bearingthisinmindmeasuresshouldbetakentomakebuildingsmoreenergy﹣efficient. F.Alternativeenergymustbediscoveredbeforethefossilfuelrunsoutinthefuture. G.Thisincludesbasicssuchasheatingandlightingandmanyotherappliances.
小华爱好玩飞镖现有如图所示的由两个边长都为2的正方形ABCD和OPQR构成的标靶图形如果O点正好是正方形ABCD的中心而正方形OPQR可以绕O点旋转则小华随机向标靶投飞镖射中阴影部分的概率是
Everyyearabout40000peopleattempttoclimbKilimanjarothehighestmountaininAfrica.They1withthemlotsofwaste.The2mightdamagethebeautyoftheplace.Theglaciers冰川aredisappearingchangingthe3ofKilimanjaro. HearingthesestoriesI'm4abouttheplace﹣otherdestinationsaredescribedaspurernaturalexperiences. HoweverIsoon5thatmuchhaschangedsincethedaysofdisturbingreportsof6amongtonsofrubbish.Ifinda7mountainwithtoiletsatcampsandalongthepaths.Theenvironmentalchallengesare8buttheeffortsmadebytheTanzaniaNationalParkAuthorityseemtobe9. ThebestofaKilimanjaro10inmyopinionisn'treachingthetop.Mountainsare11asspiritualplacesbymanycultures.This12isespeciallyevidentonKilimanjaroas13gothroughfiveecosystems生态系统inthespaceofafewkilometers.Atthebaseisarainforest.Itendsabruptlyat3000meters14landsoflowgrowingplants.Furtheruptheweather15﹣lowcloudsenvelopethemountainsideswhicharecoveredwiththickgrass.I16twelveshadesofgreenfromwhereIstand.Above4000metersisthehighland17:gravel砾石stonesandrocks.18youclimbintoanarctic﹣likezonewith19snowandtheglaciersthatmaysoondisappear. DoesKilimanjaro20itsreputationasacrowdedmountainwithlinesoftouristsruiningtheatmosphereofpeace?Ifoundtheoppositetobetrue. 1A.keep B.mix C.connect D.bring 2A.stories B.buildings C.crowds D.reporters 3A.position B.age C.face D.name 4A.silent B.skeptical C.serious D.crazy 5A.discover B.argue C.decide D.advocate 6A.equipment B.grass C.camps D.stones 7A.remote B.quiet C.all D.clean 8A.new B.special C.significant D.necessary 9A.payingoff B.spreadingout C.blowingup D.fadingaway 10A.atmosphere B.experience C.experiment D.sight 11A.studied B.observed C.explored D.regarded 12A.view B.quality C.reason D.purpose 13A.scientists B.climbers C.locals D.officials 14A.holdingonto B.goingbackto C.livingupto D.givingwayto 15A.changes B.clears C.improves D.permits 16A.match B.imagine C.count D.add 17A.village B.desert C.road D.lake 18A.Obviously B.Easily C.Consequently D.Finally 19A.permanent B.little C.fresh D.artificial 20A.enjoy B.deserve C.save D.acquire
假定你是李华.最近你校的英语戏剧社社团EnglishDramaClub需要招募一批新成员你打算加入.请根据所给提示写一封自荐信.内容包括: 1.自我介绍包括兴趣和优势 2.参加这个社团的目的 3.希望被批准 注意:1.词数100左右 2.开头和结尾已给出但不计入总词数. DearSirorMadam I'mLiHuafromClass1Grade1. Yourssincerely LiHua
ForCanaanElementary'ssecondgradeinPatchogueN.Y.todayisspeechdayandrightnowit'sChrisPalaez'sturn.The8﹣year﹣oldisthejokeroftheclass.Withshiningdarkeyesheseemslikethekindofkidwhowouldenjoypublicspeaking.Buthe'snervous.'I'mheretotellyoutodaywhyyoushouldshould'Christripsonthe'﹣ld'apronunciationdifficultyformanynon﹣nativeEnglishspeakers.HisteacherThomasWhaleyisnexttohimwhisperingsupport.'Voteforme'ExceptforsomestumblesChrisisdoingamazinglywell.WhenhebringshisspeechtoaniceconclusionWhaleyinvitestherestoftheclasstopraisehim.AsonofimmigrantsChrisstartedlearningEnglishalittleoverthreeyearsago.Whaleyrecalls回想起howatthebeginningoftheyearwhencalledupontoreadChriswouldexcusehimselftogotothebathroom.LearningEnglishasasecondlanguagecanbeapainfulexperience.Whatyouneedisagreatteacherwholetsyoumakemistakes.'Ittakesalotforanystudent'Whaleyexplains'especiallyforastudentwhoislearningEnglishastheirnewlanguagetofeelconfidentenoughtosay‘Idon'tknowbutIwanttoknow.''Whaleygottheideaofthissecond﹣gradepresidentialcampaignprojectwhenheaskedthechildrenonedaytoraisetheirhandsiftheythoughttheycouldneverbeapresident.Theanswerbrokehisheart.Whaleysaystheprojectisaboutmorethanjustlearningtoreadandspeakinpublic.Hewantsthesekidstolearntoboast夸耀aboutthemselves.'Boastingaboutyourselfandyourbestqualities'Whaleysays'isverydifficultforachildwhocameintotheclassroomnotfeelingconfident.'1WhatmadeChrisnervous?A.Tellingastory.B.Makingaspeech.C.Takingatest.D.Answeringaquestion.2Whatdoestheunderlinedword'stumbles'inparagraph2referto?A.Improperpauses.B.Badmanners.C.Spellingmistakes.D.Sillyjokes.3WecaninferthatthepurposeofWhaley'sprojectisto.A.helpstudentsseetheirownstrengthsB.assessstudents'publicspeakingskillsC.preparestudentsfortheirfuturejobsD.inspirestudents'loveforpolitics4WhichofthefollowingbestdescribesWhaleyasateacher?A.Humorous.B.Ambitious.C.Caring.D.Demanding.
已知命题pm∈02命题q双曲线的离心率e则p是q的
某四面体三视图如图所示则该四面体最长的棱长与最短的棱长的比是
TheSpanishsculptorIsaacCordalseesthecityashisplayground.Hespecializesinminiatureastreetartoftenrepresentingasocialcommentaryasacriticalobservationoncapitalismpowerandsoon.Cordalfirstmodelsthesculpturesinclaythenreproducesthemincement水泥about15cminheight.'Asamaterialcementseemsverysymbolicbecauseitisoneofourmostrecognizablefootprintsagainstnature.'hesays.'Todaywehavebeentoousedtocementcityhabitat.'Forseveralyearshe'sbeenworkingontheprojectCementEclipsesreferringtothestatewhenabuildingcoversthesun:'It'sacriticalreflectionontheideaofprogress.'ThesetinycementfigureshaveappearedincitiesacrossEuropefoundsittingontopofbussheltersordrowninginthegrasslandofthebigcity.'ThestreetbecameaperfectsettinginwhichIcouldfindenoughlandscapesforthem.Duetotheirsmallsizeandcolortheygoreallywellintotheurbanenvironment.Theyevennormallygounseenbypassersby.I'mveryinterestedinthatmomentofsurprisewhensomeoneaccidentallydiscoversthem.'hesays.'Nowadaysthereisafearofnotbeingseeninthepublicareasoeverythingisalwaysbigandbold.Webecomeaproductofthisanddonotfocusinasmuch.Ithinkitisgoodtopayattentiontosmalldetails.Myworkisarewardforthosewhodoanditallowsustounderstandandchangetheworldwehavecreatedinadifferentangle.'Cordalsays.1Whichofthefollowingbestexplains'miniature'Underlinedinparagraph1?A.Tinysculpture.B.Smallplayground.C.Socialcomments.D.Criticalobservation.2What'sCordal'sattitudetowardcementcityhabitat?A.Indifferent.B.Critical.C.Neutral.D.Supportive.3WhatdoesCordalintendtotellusinthelastparagraph?A.Everythingbiginpublicisattractive.B.Beingsmallmaybeafearinpublic.C.Weneedtofocusonthedetailsoftheproducts.D.Hisworkhelpsustoseetheworlddifferently.4Whatdoesthetextmainlytalkabout?A.Cordalandhisstreetart.B.Waystobeasculptor.C.Materialsusedforsculptures.D.Reflectionsoncityprogress.
AlbertEinsteinthegeniusbehindthetheoryofrelativityhasrecentlybeenmakingheadlinesagain.Howeverthistimeitisnotforanewscientificbreakthrough1forahandwrittennotehegaveabellboy95yearsago. InOctober1922EinsteinwasdeliveringaseriesoflecturesinJapan2hereceivedatelegraminforminghimthathe3awardtheNobelPrizeforPhysics. Though4pleaseatthenewstheNobelwinnerdecidedtocontinuewithhisJapanesetripinsteadof5headtoStockholmtoacceptthehonor. WhileinTokyohepenned6noteinGermansayingAquietandhumblelifewillbringmore7happythanthepursuitofsuccess…PerhapshehadnoloosechangetotipabellboycomingtodeliverthemessagehegavehimthenoteandtoldhimMaybeifyouareluckythenote8becomemorevaluablethanjustaregulartip. Earlierthisyearthebellboy'snephewdecidedtohandittoJerusalem﹣basedWinner'sAuctions拍卖andExhibitions.Thenotewasthenputupforauction9mightbringtheownerasurprising$1.56million10aEuropeanbuyer.ItwasarecordforanauctionofadocumentinIsraelandthewild﹣hairedscientistdeservedit.
中国古代数学家朱世杰所著算学启蒙一书中提到关于“松竹并生”的问题松长五尺竹长两尺松日自半竹日自倍松竹何日而长等.意思是“现有松树高5尺竹子高2尺松树每天长自己高度的一半竹子每天长自己高度的一倍问在第几天会出现松树和竹子一般高”如图是源于其思想的一个程序框图若输入x=5y=2问输出n的结果为
已知复数z满足z+ii=2﹣3i则|z|=
Theyhadbeenon1weplanetsformillionsofyearsbut2018wastheyearseveralspecies2officialdiedoffforever.Threebirdspecieswentextinctthisyeartwoof3aresongbirdsfromnortheasternBrazil.A4disturbtrendisthatmainlandspeciesarestartingtogoextinctratherthanislandspecies.Thespecies5wipeoutinthewildresultedfrommanyfactorssuchasthecreationofdamandtrapping6trade.Beyondbirdsotheranimalssuchasthevaquitaandthenorthernwhiterhino7beneartheend.Wearecurrentlyexperiencingtheworstspeciesdie﹣offssincethe81oseofthedinosaurs65millionyearsago.Althoughextinctionisa9naturephenomenonitoccursatarateofaboutonetofivespeciesperyear.Scientistsestimatewe'renowlosingspeciesat1000to10000timestherate.Inthepast500yearsabout1000species10goextinct.
一个样本容量为10的样本数据它们组成一个公差为2的等差数列{an}若a1a3a7成等比数列则此样本的平均数和中位数分别是
设集合A={x∈R|x>2}B={x∈R|x2﹣3x≤0}则A∩B等于
如图在矩形ABCD中AB=2BC=1矩形ABEF是通过矩形ABCD以直线AB为轴旋转得到且BC⊥BE动点M在CD上. 1求证平面MBE⊥平面ABCD 2当M为CD的中点时求二面角B﹣EM﹣C的大小.
函数fx=2cosxsinxsin2x+sinxcosx在x∈[]的值域为.
Ifyoufollowtheseinsidertipsyourphotoswilllooklikeyouhadtheplacetoyourselfatthepopulartouristattractions.VaticanMuseums:VaticanCityTheVaticandrawsmorethanfivemillionpeopleeachyearandqueuescanreachfourhoursduringpeakseason.ChristieHudsonseniorcommunicationsmanageratExpediarecommendschoosingaskip﹣the﹣1inetour.'Thisnotonlyletsyouavoidtheticketcounterbutalsoincludestheuseofaprivatepartnerentrance.'ExtratimetovisittheSistineChapel?Yes!BambooForest:KyotoJapanBambooForestisthemostworthysightinKyoto.Ⅱyou'relongingtoenjoythepathwaysandtakepicturesintotalquietnessKyotoArashiyamaTravelGuiderecommendshittingthefamousBambooGrovePathasearlyinthemorningaspossible﹣think7a.m.ifyou'reupforit.Don'tmissthesehiddentreasuresyoucanonlywitnessinJapan.ChichenItza:YucatánMexicoHometoE1CastilloandtheTempleoftheWarriorsChichenItzaisamust﹣see.Wanttobeattherush?Scheduleanearlytourthattakesplacebeforeasiteopenstothepublic.Ledbyanarchaeologistguideit'sfulloffascinatinginsightsandfacts﹣withouttonsofpack﹣wearingtourists.LouvreMuseum:ParisFranceTheLouvreisoneofthemostpopularmuseumsontheplanet.Ifwaitingaroundinlinetogetinisn'tthewayyouprefertospendyourtimeinParisconsiderpurchasingareservedticket.Thiswillgiveyouentrytothepyramidwithinahalf﹣hourwindow.TheLouvreisalsoopenuntil9:45p.m.onWednesdaysandFridaysifyou'reupforsomelate﹣nightartvisits.1WhatisrecommendedatVaticanMuseumsbyChristieHudson?A.Queuingfourhours.B.Jumpingthewaitingline.C.Takingaskip﹣the﹣linetour.D.VisitingtheSistineChapel.2Whichofthefollowingareavailableforearlytouriststoavoidtherush?A.VaticanMuseumsandBambooForest.B.ChichenItzaandBambooForest.C.BambooForestandLouvreMuseum.D.ChichenItzaandLouvreMuseum.3Whomightthispassagebeintendedfor?A.Visitorsinterestedinmuseums.B.Guidesatthetouristattractions.C.Peopleattheticketcounter.D.Touriststobeattherush.
在△ABC中=E为AC中点CD与BE交点为F过点F的直线1分别交线段ABAC于点MN.若═λ=μ则λ+μ的最小值为.
已知函数fx=+ax+3gx=x3若∀mn∈[]fm﹣gn≥0则实数a的取值范围为
已知函数fx=2sinωx﹣ω>0和gx=3cos2x+φ+1|φ|<的图象的对称轴完全相同则下列关于gx的说法正确的是
假如你是校英文报编辑李华.你校原定于本星期五下午在302室举办的英文经典片段配音比赛EnglishDubbingContest因故需更改时间和地点.请你写一封电子邮件通知评委中的外教Mrs.Jenkins内容包括: 1.比赛更改原因; 2.更改后的安排; 3.表达歉意. 注意:1.词数100左右; 2.可以适当增加细节以使行文连贯.
已知椭圆C+=1a>b>0过点A01且椭圆的离心率为.Ⅰ求椭圆C的方程Ⅱ斜率为1的直线l交椭圆C于Mx1y1Nx2y2两点且x1>x2.若直线x=3上存在点P使得△PMN是以∠PMN为顶角的等腰直角三角形求直线l的方程.
数列{an}是等差数列{bn}是各项均为正数的等比数列公比q>1且a5=b5则
Theworldisagreenerplacethanitwas20yearsago.Astudypublishedinthejournal'NatureSustainability'saidthatrecentsatellitedatarevealsagreeningpatternthatisstrikinglyprominentinChinaandIndia.ThestudyshowsthathumanactivityinChinaandIndiadominatesthisgreeningoftheplanetthankstotreeplantingandagriculture.Theeffectcomesmostlyfromambitioustree﹣plantingprogramsinChinaandintensiveagricultureinbothcountries.'ChinaandIndiaaccountforone﹣thirdofthegreening'saidleadauthorChiChenofBostonUniversity.'Thatisasurprisingfindingconsideringthevagueideaoflanddegradation毁坏inpopulouscountriesfromoverexploitation'addedChen.Chinaaloneaccountsfor25percentoftheglobalnetincreaseinleafareawithonly6.6percentofglobalvegetatedarea.ThegreeninginChinaisfromforests42percentandcroplands32percentbutinIndiaitismostlyfromcroplands82percentwithminorcontributionfromforests4.4percent.China'soutsizedcontributiontotheglobalgreeningtrendcomesinlargepartfromitsprogramstoconserveandexpandforestswiththegoalofpreventinglanddegradationairpollutionandclimatechange.'Oncepeoplerealizethereisaproblemtheytendtofixit'saidRamaNemaniresearchscientistandco﹣authorofthestudy.'Inthe1970sand80sinIndiaandChinathesituationaroundvegetationlosswasnotgood.Inthe1990speoplerealizeditandtodaythingshaveimproved.Nowweseethathumansarecontributing.'LandareausedtogrowcropsiscomparableinChinaandIndia﹣morethan770000squaremiles﹣andhasnotchangedmuchsincetheearly2000s.Yettheseregionshavegreatlyincreasedboththeirannualtotalgreenleafareaandtheirfoodproduction.Thiswasachievedthroughmultiplecroppingpracticeswhereafieldisreplantedtoproduceanotherharvestseveraltimesayear.Productionofgrainsvegetablesfruitsandmorehaveincreasedbyabout35%~40%since2000tofeedtheirlargepopulations.1Whatdidthestudymainlyfind?A.IndiaandChinaareleadingtheglobalgreeningeffort.B.Intensiveagricultureisthecauseofgloballanddegradation.C.ChinaandIndiahasgotthelargestforestcoverageintheworld.D.Agricultureismorehelpfulinexpandinggreenareasthantree﹣planting.2HowisChinadifferentfromIndiaincontributingtotheglobalgreening?A.Indiareducedcroplandtopreventtheoverexploitation.B.Indiaincreasedforestbyplantingaroundcroplands.C.Chinachangedmorelandsintoforestbyplantingtrees.D.Chinacontrolledtheincreaseofitspopulation.3WhatdoesNemanithinkabouthumansinChinaandIndiainprotectingtheEarth?A.Ambitious.B.Responsible.C.Passionate.D.Tolerant.4Whatdoesthepassagefinallysuggesthumansshouldmakegooduseof?A.Forest.B.Trees.C.Cropland.D.Food
假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.每处错误仅涉及一个单词的增加删除或修改. 增加:在缺词处加一个漏字符号∧并在其下面写出该加的词. 删除:把多余的词用斜线\划掉. 修改:在错的词下划一横线并在该词下面写出修改后的词. 注意:1.每处错误及其修改均仅限一词; 2.只允许修改10处多者从第11处起不计分. Ibecameinterestinginplayingfootballthankstoasmallaccident.OneafternoonwhereIwasinprimaryschoolIwaswalkingbytheschoolplayground.Suddenlyfootballfelljustinfrontofmebutalmosthitme.Istoppedtheballandkickedithardlybacktotheplayground.Toeveryone′ssurprisingtheballwentintothenet.AllthefootballplayerontheplaygroundcheeredloudlysaythatIhadatalentforfootball.FromnowonIstartedtoplaymyfootballwithclassmatesafterschool.Iamagoodplayernow.
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