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设等差数列an的前n项和为Sn,若a1=-5,且它的前11项的平均值是5。 (1)求等差数列的公差d; (2)求使Sn>0成立的最小正整数n。
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设等差数列{an}的前n项和为Sna2a4是方程x2-x-2=0的两个根S5=.
等差数列{an}前n项和Sn若S10=S20则S30=__________.
等差数列{an}前n项和为Sn若a1=-11a4+a6=-6则当Sn取最小值时n等于
6
7
8
9
设an是递增等差数列前三项的和为12前三项的积为48则它的首项是.
1
2
4
6
已知Sn为等差数列{an}的前n项的和若a2+a5=4S7=21则a7的值为.
已知公差不为0的等差数列{an}的前n项和为SnS3=a4+6且a1a4a13成等比数列.Ⅰ求数列{
设等差数列的前n项和为Sn若Sm-1=-2Sm=0Sm+1=3则m=.
设{an}是首项为a公差为d的等差数列d≠0Sn是其前n项和记其中c为实数 若{bn}是等
若等差数列的前6项和为23前9项和为57则数列的前n项和Sn=________.
在等差数列{an}中若a4+a6=12Sn是数列{an}的前n项和则S9的值为
48
54
60
66
已知数列{an}的各项均为正数前n项和为Sn且Sn=n∈N*.1求证数列{an}是等差数列2设bn=
设数列{an}的前n项和为Sna1=3且an+1=2Sn+3数列{bn}为等差数列且公差d>0b1+
设{an}是公比为正数的等比数列a1=2a3=a2+41求{an}的通项公式;2设{bn}是首项为1
已知{an}是等差数列前n项和为Sna1=120公差d=-4若Sn≤ann≥2则n的最小值为
60
62
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72
已知各项均为正数的数列{an}的前n项和为Sn首项为a1且anSn成等差数列.1求数列{an}的通项
设数列{an}是递增等差数列前三项的和为12前三项的积为48则它的首项是
设{an}是首项为a1公差为-1的等差数列Sn为其前n项和若S1S2S4成等比数列则1a的值为
设{an}是递减的等差数列前三项的和是15前三项的积是105当该数列的前n项和最大时n等于
4
5
6
7
设等差数列an的前n项和为Sn若a6=S3=12则
已知数列为等差数列若0的n的最大值为.
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Anewsetofbrainimagesshows:ReadingtheRomanalphabetsandChinesecharactersusesdifferentpartsofthebrain.TheresultsalsosuggestthatChineseschoolchildrenhavereadingproblemsinadifferentpartofthebrainusedinreadingalphabet-basedlanguages.Thisshowsthatthelearningdisorderdyslexiainabilitytoreadproperlyisnotthesameinverycultureanddoesnothaveauniversalbiologicalcause.Scientistsdescribedtheresultsasveryimportantandrevolutionary.WhiledyslexiahascertaincommonrootstheysaidtheynowhavesomeproofthatthiskindoffunctionalproblemworksdifferentlyaccordingtothedifferentdemandsthatWesternandEasternlanguagesplaceonthebrain.Dyslexiaisacommondevelopmentaldisorderinwhichpeopleofnormalintelligencehavedifficultylearningtoreadspellandmasterotherlanguageskills.Theresultssuggestthattreatingdyslexiaaroundtheworldprobablywillrequiredifferenttreatments.ReadingiscomplexsaidGuinevereEdenGeorgetownUniversityprofessor.Thisshowsweneedtobemoreopen-mindedaboutdiversetreatmentapproaches.Itsoriginsarecomplex.Thereappearstobeageneticaspecttotheillness.Italsomayresultfrombraininjurybeforebirththatchangesvisualandhearingpathwaysinthebrain.EarlierbrainscansshowthatEnglish-readingdyslexicsdon’tfunctionproperlyinaleftpartofthebrainassociatedwiththeawarenessof44soundsfromtheEnglishalphabets.HoweveraccordingtothenewstudyreadingChineseusessomedifferentpartsofthebrainlocatedintheleft-frontofthebrain.Itisassociatedwithsymbolinterpretation.UnlikealphabetlettersChinesecharactersrepresententirethoughtsandphysicalobjects.TitleDyslexiaDefinitionalearning56inwhichpeopleofaverageIQfindit57tolearntoreadandacquireotherlanguageskillsOriginsGeneticcausesorbrain58beforebirthwhichaffects59andhearingabilitiesFindingoftheearlierstudy60readingdyslexicsdon’tfunctionproperlyinaleftpartofthebrainDiscoveryofthenewstudyReadingChineseusesthe61partofthebrainConclusionReadingRomanalphabetsandreadingChinesecharactersplacedifferent62onthebrain.Dyslexiaisnotthesameinevery63anddoesnothavethesame64roots.65Dyslexianeedstobetreatedindifferentways
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Anewsetofbrainimagesshows:ReadingtheRomanalphabetsandChinesecharactersusesdifferentpartsofthebrain.TheresultsalsosuggestthatChineseschoolchildrenhavereadingproblemsinadifferentpartofthebrainusedinreadingalphabet-basedlanguages.Thisshowsthatthelearningdisorderdyslexiainabilitytoreadproperlyisnotthesameinverycultureanddoesnothaveauniversalbiologicalcause.Scientistsdescribedtheresultsasveryimportantandrevolutionary.WhiledyslexiahascertaincommonrootstheysaidtheynowhavesomeproofthatthiskindoffunctionalproblemworksdifferentlyaccordingtothedifferentdemandsthatWesternandEasternlanguagesplaceonthebrain.Dyslexiaisacommondevelopmentaldisorderinwhichpeopleofnormalintelligencehavedifficultylearningtoreadspellandmasterotherlanguageskills.Theresultssuggestthattreatingdyslexiaaroundtheworldprobablywillrequiredifferenttreatments.ReadingiscomplexsaidGuinevereEdenGeorgetownUniversityprofessor.Thisshowsweneedtobemoreopen-mindedaboutdiversetreatmentapproaches.Itsoriginsarecomplex.Thereappearstobeageneticaspecttotheillness.Italsomayresultfrombraininjurybeforebirththatchangesvisualandhearingpathwaysinthebrain.EarlierbrainscansshowthatEnglish-readingdyslexicsdon’tfunctionproperlyinaleftpartofthebrainassociatedwiththeawarenessof44soundsfromtheEnglishalphabets.HoweveraccordingtothenewstudyreadingChineseusessomedifferentpartsofthebrainlocatedintheleft-frontofthebrain.Itisassociatedwithsymbolinterpretation.UnlikealphabetlettersChinesecharactersrepresententirethoughtsandphysicalobjects.TitleDyslexiaDefinitionalearning56inwhichpeopleofaverageIQfindit57tolearntoreadandacquireotherlanguageskillsOriginsGeneticcausesorbrain58beforebirthwhichaffects59andhearingabilitiesFindingoftheearlierstudy60readingdyslexicsdon’tfunctionproperlyinaleftpartofthebrainDiscoveryofthenewstudyReadingChineseusesthe61partofthebrainConclusionReadingRomanalphabetsandreadingChinesecharactersplacedifferent62onthebrain.Dyslexiaisnotthesameinevery63anddoesnothavethesame64roots.65Dyslexianeedstobetreatedindifferentways
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Thepolicefiredteargasandarrestedmorethan5000passivelyresistingprotestorsFridayinanattempttobreakupthelargestantinucleardemonstrationeverstagedintheUnitedStates.Morethan135000demonstratorsconfrontedthepoliceontheconstructionsiteofa1000-megawattnuclearpowerplantscheduledtoprovidepowertomostofsouthernNewHampshire.Organizersofthehugedemonstrationsaidthattheprotestwascontinuingdespitethepoliceactions.Moredemonstratorswerearrivingtokeepupthepressureonstateauthoritiestocanceltheproject.Thedemonstratorhadchargedthattheprojectwasunsafeinthedenselypopulatedareawouldcreatethermalpollutioninthebayandhadnoacceptablemeansfordisposingofitsradioactivewasters.Thedemonstrationswouldgoonuntilthejailsandthecourtsweresooverloadedthatthestatejudicialsystemwouldcollapse.GovernorStanforthThumperinsistedthattherewouldbenoreconsiderationofthepowerprojectandnodelayinitsconstructionsetforcompletioninthreeyears.Thisprojectwillbeginontimeandthepeopleofthisstatewillbegintoreceiveitsbenefitsonschedule.Thosewhobreakthelawinmisguidedattemptstosabotagetheprojectwillbedealtwithaccordingtothelawhesaid.Andthepolicecalledinreinforcementsfromalloverthestatetohandlethedisturbances.TheprotestsbeganbeforedawnFridaywhenseveralthousanddemonstratorsbrokethroughthepolicelinesaroundthecordoned-offconstructionsite.TheycarriedplacardsthatreadNoNukesisGoodNukesSunpowerNotNuclearPowerandStopPrivateProfitsfromPublicPeril.Theydefiedpoliceordertomovefromthearea.Teargascanistersfiredbythepolicefailedtodislodgetheprotestorswhohadbeenpreparedwiththeirowngasmasksorfacecloths.Finallythegas-maskedandhelmetedpolicechargedintothecrowdtodragoffthedemonstratorsonebyone.Theprotestorsdidnotresistthepolicebutrefusedtowalkawayundertheirownpower.Thosearrestedwouldbechargedwithunlawfulassemblytrespassinganddisturbingthepeace.Withwhomwerethejailsandcourtsoverloaded
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下列不属于先秦历史散文的一项是
外无期功强近之亲____________形影相吊李密陈情表
文言文阅读阅读下面的文言文完成11-14题皇甫谧字士安幼名静安定朝那人汉太尉嵩之曾孙也出后叔父徙居新安年二十不好学游荡无度或以为痴尝得瓜果辄进所后叔母任氏任氏曰孝经云‘三牲之养犹为不孝’汝今年余二十目不存教心不入道无以慰我因叹日昔孟母三徙以成仁曾父烹豕以存教岂我居不卜邻教有所缺何尔鲁钝之甚也!修身笃学自汝得之于我何有!因对之流涕谧乃感激就乡人席坦受书勤力不怠居贫躬自稼穑带经而农遂博综典籍百家之言沉静寡欲始有高尚之志以著述为务自号玄晏先生著礼乐圣真之论后得风痹疾犹手不辍卷或劝谧修名广交谧以为居田里之中亦可以乐尧舜之道何必崇接世利事官鞅掌‘引然后为名乎遂不仕耽玩典籍忘寝与食时人谓之书淫或有箴其过笃将损耗精神谧日朝闻道夕死可矣况命之修短分定悬天乎!城阳太守梁柳谧从姑子也当之官人劝谧饯之谧曰柳为布衣时过吾吾送迎不出门食不过盐菜贫者不以酒肉为礼今作郡而送之是贵城阳太守而贱梁柳岂中古人之道是非吾心所安也时魏郡召上计掾举孝廉景元初相国亦尝诏之谧皆不应其后武帝频下诏敦逼不已谧上疏自陈辞切言至遂见听许自表求帝借书帝送一车书与之太康三年卒时年六十八所著甚多并重于世晋书·皇甫谧传[注]鞅掌事务繁杂下列对原文有关内容的分析和概括不正确的一项是
<论语十则是人教版语文七年级上册的一篇课文也是中学阶段学生较早接触的文言文下面是一位教师的课堂教学实录的片断请根据这位教师的课堂教学设计与课堂实际内容选择一个角度谈谈你对于文言文教学的看法 在正式的内容讲完之后往往要组织一些活动课它是“大语文教育”的重要一翼当年杭州二中的著名特级教师林炜彤先生曾对我说过学生最讨厌什么样的课——公开课最喜欢什么样的课——七扯八扯的课我理解所谓“七扯八扯的课”其实就是活动课就是教学内容向课外向生活的延伸由于能扩展视野满足好奇心和求知欲又没有必须完成的作业它备受学生欢迎活动课还能密切师生关系加深师生感情别忘了“亲其师”才能“信其道”我在这一课组织的活动是 1网上拜访孔子点击进入①“中国孔子”网站②孔子博物院③孔子箴言名句这些网站中有许多有趣的东西 2中央电视台“千秋史话”节目之孔子我这里有一套“千秋史话”的光盘电视往往是很有吸引力的 3探究性学习这一项最有价值我这样安排 朱熹说“读书无疑者须先教有疑有疑者却要无疑到这里方是长进”你有“疑”特别是“无疑之疑”吗在适当的时候老师提出自己准备的问题“学而时习之不亦说乎有朋自远方来不亦乐乎人不知而不愠不亦君子乎”这三句有什么内在联系可能不可能没什么联系先向学生交代这个问题是许多人不解的问题几个语文网站的“论坛”中都有人讨论这个问题可惜结论都不能让人信服你若能解决这个问题就是一种创见
EducatorsareseriouslyconcernedaboutthehighrateofdropoutsamongthedoctorofphilosophycandidatesandtheconsequentlossoftalenttoanationinneedofPhDs.Somehaveplacedthedropoutslossashighas50percent.Theextentofthelosswashoweverlargelyamatterofexpertguessing.Lastweekawell-roundedstudywaspublished.Itwasbasedon22000questionnairessenttoformergraduatestudentswhowereenrolledin24universitiesanditseemedtoshowmanypastfearstobegroundless.Thedropoutsratewasfoundtobe31percentandinmostcasesthedropoutswhilenotcompletingthePhDrequirementwentontoproductivework.Theyarenotonlydoingwellfinanciallybutaccordingtothereportarenotfarbelowtheincomelevelsofthosewhowentontocompletetheirdoctorates.DiscussingthestudylastweekDr.TuckersaidtheprojectwasinitiatedbecauseoftheconcernfrequentlyexpressedbygraduatefacultiesandadministratorsthatsomeoftheindividualswhodroppedoutofPhDprogramswerecapableofcompletingtherequirementforthedegree.AttritionatthePhDlevelisalsothoughttobeawasteofpreciousfacultytimeandadrainonuniversityresourcesalreadybeingusedtocapacity.SomepeopleexpressedtheopinionthattheshortageofhighlytrainedspecialistsandcollegeteacherscouldbereducedbypersuadingthedropoutstoreturntograduateschoolstocompletethePhD.TheresultsofourresearchDr.Tuckerconcludeddidnotsupporttheseopinions.1.Lackofmotivationwastheprincipalreasonfordroppingout:2.Mostdropoutswentasfarintheirdoctoralprogramaswasconsistentwiththeirlevelsofabilityortheirspecialities.3.Mostdropoutsarenowengagedinworkconsistentwiththeireducationandmotivation.Nearly75percentofthedropoutssaidtherewasnoacademicreasonfortheirdecisionbutthosewhomentionedtheacademicreasoncitedfailuretopassthequalifyingexaminationuncompletedresearchandfailuretopasslanguageexams.Amongthesinglemostimportantpersonalreasonsidentifiedbydropoutsfornon-completionoftheirPhDprogramlackoffinanceswasmarkedby19percent.Asanindicationofhowwellthedropoutsweredoingachartshowed2%inhumanitieswerereceiving$20000andmoreannuallywhilenoneofthePhD’swiththatbackgroundreachedthisfigure.ThePhD’sshoneinthe$7500to$15000bracketwith78%atthatlevelagainst50%forthedropouts.ThismayalsobeanindicationofthefactthattopsalariesintheacademicfieldswherethePhD’stendtorisetothehighestsalariesarestilllaggingbehindotherfields.Astothepossibilityofgettingdropoutsbackoncampustheoutlookwasglum.Themainconditionwhichwouldhavetoprevailforatleast25%ofthedropoutswhomightconsiderreturningtothegraduateschoolwouldbetoguaranteethattheywouldretaintheirpresentlevelofincomeandinsomecasestheirpresentjob.Theauthorstatesthatmanyeducatorsfeelthat______.
把文言文阅读材料中画横线的句子翻译成现代汉语朝闻道夕死可矣况命之修短分定悬天乎!
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