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已知椭圆C1的方程为双曲线C2的左、右焦点分别为C1的左、右顶点,而C2的左、右顶点分别是C1的左、右焦点。 (1)求双曲线C2的方程; (2)若直线l:与椭圆C1及双曲线C2恒有两个不同的交点,...
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5.00分已知命题在平面直角坐标系xOy中椭圆△ABC的顶点B在椭圆上顶点AC分别为椭圆的左右焦点
已知椭圆的方程为双曲线的左右焦点分别为的左右顶点而的左右顶点分别是的左右焦点.Ⅰ求双曲线的方程Ⅱ若直
已知A.是双曲线的左顶点F1F2分别为双曲线的左右焦点P.为双曲线上一点G.是△PF1F2的重心若则
如图所示双曲线的中心在坐标原点焦点在x轴上F.1F.2分别为左右焦点双曲线的左支上有一点P.∠F.1
已知椭圆C1的方程为双曲线C2的左右焦点分别是椭圆C1的左右顶点而双曲线C2的左右顶点分别是椭圆C1
已知双曲线-=1a>0b>0的左右焦点分别为F.1F.2点P.在双曲线的右支上且|PF1|=4|PF
已知
是双曲线
=1(a>0,b>0)的左顶点,F.
1
、F.
2
分别为双曲线的左、右焦点,P.为双曲线上一点,G.是△PF
1
F.
2
的重心,若
,则双曲线的离心率为( ) A.2
3
4
与λ的取值有关
已知A.是双曲线的左顶点F1F2分别为双曲线的左右焦点P.为双曲线上一点G.是△PF1F2的重心若则
已知双曲线的左焦点为F1左右顶点分别为A1A2P.为双曲线上任意一点则分别以线段PF1A1A2为直径
相交
相切
相离
以上情况都有可能
已知F.1F.2分别为双曲线a>0b>0的左右焦点P.为双曲线右支上的任意一点若的最小值为8a则双曲
(1,+∞)
(1,2]
(1,
]
(1,3]
已知
是双曲线
的左顶点,F
1
、F
2
分别为双曲线的左、右焦点,P.为双曲线上一点,G.是△PF
1
F
2
的重心,若
,则双曲线的离心率为 A.2
3
4
与
的取值有关
已知曲线C1C2的极坐标方程分别为ρcosθ=3ρ=4cosθ则曲线C1C2交点的极坐标为
已知椭圆C1抛物线C2的焦点均在x轴上C1的中心和C2的顶点均为原点D从每条曲线上取两个点将其坐标记
已知双曲线C.a>0b>0的左右焦点分别为F1F2点M.与双曲线C.的焦点不重合点M.关于F1F2的
,
,线段MN的中点在双曲线的右支上,若|AN|﹣|BN|=12,则a= A.3B.4
5
6
已知双曲线-=1a>0b>0的左右焦点分别为F1F2以F1F2为直径的圆与双曲线在第一象限的交点为P
已知中心在坐标原点的椭圆和双曲线的焦点相同左右焦点分别为F1F2这两条曲线在第一象限的交点为P.且△
1
2
+3
2
3一2
已知点P.是双曲线a>0b>0右支上一点F.1F.2分别为双曲线的左右焦点H.为△PF1F.2的内心
已知双曲线C.a>0b>0的左右焦点分别为F1F2点M.与双曲线C.的焦点不重合点M.关于F1F2的
,
,线段MN的中点在双曲线的右支上,若|AN|﹣|BN|=12,则a= A.3B.4
5
6
已知椭圆C.1的方程为+y2=1双曲线C.2的左右焦点分别是C.1的左右顶点而C.2的左右顶点分别是
已知有公共焦点的椭圆与双曲线的中心为原点焦点在x轴上左右焦点分别为F.1F.2且它们在第一象限的交点
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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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请简述你对正确把握语文教育特点问题的认识
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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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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______.
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.MeetingforeignlanguagerequirementsforthePhD______.
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.Itcanbeinferredthatthehighrateofdropoutsliesin______.
<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
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
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