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When people talk about the digital divide, they usually mean the (1) between people who are ben...
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WhenpeopletalkaboutthehistoricspotsinBeijingthefir
which
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WhenChinesepeopletalkaboutAmericancitiesthefirst__
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阅读B.部分内容选出最佳答案InEnglandpeopledon’tusuallytalktoomu
Inmostlanguagesagreetingisusuallyfollowedbysmallta
Nowadayswhenpeopletalkaboutmagiciansthefirstone___
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WhenpeopletalkaboutthecitiesoftheU..S..thefirst___
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Inmostlanguagesagreetingisusuallyfollowedbysmallta
InEnglandpeopledon’toftentalktoeachotherwhentheytr
阅读理解InEnglandpeopledon’tusuallytalktoomuch.Youcang
.WhenforeignpeopletalkaboutthecitiesofChinathefirs
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Inmostlanguagesagreetingisusuallyfollowedbysmallta
WhenpeopletalkaboutthescenicspotsinAnhuithefirst__
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InEnglandpeopledon’toftentalkmuch.Youcangetonabuso
阅读理解InEnglandpeopledon’tusuallytalktoomuch.Youcang
Nowadayswhenpeopletalkaboutmagiciansthefirstonecom
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WhenpeopletalkabouttheNewWorldtheyreferto______.
the UK
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WhenpeopletalkaboutthecitiesofChinathefirst____com
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InEnglandpeopledon’toftentalkmuch.Youcangetonabuso
阅读理解InEnglandpeopledon’toftentalktoeachotherwhenth
Inmostlanguagesagreetingisusuallyfollowedbysmallta
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已知A=α1α2α3β和B=α1α2α3γ都是4阶矩阵．其中α1α2α3βγ均为4维列向量且|A|=2|B|=-3．则|2A+B|=______.
设D为闭区域x2+y2≤1则
设fx与gx在x=0的某去心邻域内有定义并且当x→0时fx与gx都为x的同阶无穷小则当x→0时______
设f’’x在[01]上连续且f0=f1=0求证
已知求uxy及其极值．
设fx在[ab]上可导且f’af’b＜0则下列命题①至少存在一点x0∈ab使得fx0＜fa②至少存在一点x0∈ab使得fx0＞fb③至少存在一点x0∈ab使得f’x0=0④至少存在一点x0∈ab使得fx0=正确的个数为______
Asthebaby-boomergenerationcontemplatestheprospectoftheZimmerframetherehasneverbeenmoreinterestindelayingtheprocessofageing.Oneconsequencehasbeenan1riseinthepopularityofbrain-traininggames.Buthow2reallyisadailydoseofcrypticcrossword RobertWilsonaneuropsychologistatRushUniversityinChicagoandhiscolleaguesdecidedto3out4followingagroupofpeoplewithoutdementia.Participantswereaskedto5howfrequentlytheyengagedincognitively6activities.Theresearcherswerelookingforsuchthingsasreadingnewspapersbooksandmagazines7challenginggameslikechesslisteningtotheradioandwatchingtelevisionand8museums. ThegoodnewsastheyreportinNeurologyisthat9activityofthissortseemstoslowtherateof10declineinthosewithoutcognitive11.ThebadnewsisthatinthosewhodothendevelopAlzheimer’sdiseaseitisassociatedwithamorerapid12decline. Whatseemstobehappeningisthatcognitivestimulationhelps13theeffectoftheneurodegenerativelesionsassociatedwithdementia.Itdoesnot14makethemgoaway.Theycontinueto15sothatwhenthediseasedoeseventuallytake16therearemoreofthemaroundthanthereotherwisewouldbewhichresultsinamore17cognitivefalloff.Thatisnotamessageofdespair18becausethelengthoftimesomeonesuffersfromdementiaisthus19andtheirhealthylifeprolonged.Sothemessageis20onwiththecrosswords. 4
设n为正整数则______.
Asthebaby-boomergenerationcontemplatestheprospectoftheZimmerframetherehasneverbeenmoreinterestindelayingtheprocessofageing.Oneconsequencehasbeenan1riseinthepopularityofbrain-traininggames.Buthow2reallyisadailydoseofcrypticcrossword RobertWilsonaneuropsychologistatRushUniversityinChicagoandhiscolleaguesdecidedto3out4followingagroupofpeoplewithoutdementia.Participantswereaskedto5howfrequentlytheyengagedincognitively6activities.Theresearcherswerelookingforsuchthingsasreadingnewspapersbooksandmagazines7challenginggameslikechesslisteningtotheradioandwatchingtelevisionand8museums. ThegoodnewsastheyreportinNeurologyisthat9activityofthissortseemstoslowtherateof10declineinthosewithoutcognitive11.ThebadnewsisthatinthosewhodothendevelopAlzheimer’sdiseaseitisassociatedwithamorerapid12decline. Whatseemstobehappeningisthatcognitivestimulationhelps13theeffectoftheneurodegenerativelesionsassociatedwithdementia.Itdoesnot14makethemgoaway.Theycontinueto15sothatwhenthediseasedoeseventuallytake16therearemoreofthemaroundthanthereotherwisewouldbewhichresultsinamore17cognitivefalloff.Thatisnotamessageofdespair18becausethelengthoftimesomeonesuffersfromdementiaisthus19andtheirhealthylifeprolonged.Sothemessageis20onwiththecrosswords. 8
设fx在[ab]上可导又f’x+[fx]2-则在ab内______
设α1α2α3α4β为四维列向量A=[α1α2α3α4]已知Ax=β的通解为为对应齐次方程组的基础解系k1k2为任意常数．令B=[α1α2α3]试求By=β的通解．
设fx和gx在[01]上连续在01内可导f0=f1=-1．试证至少存在一点e∈01使f′ξ+g′ξ[fξ-ξ]=1．
证明当x＞0时有不等式1+xln1+x＞arctanx．
Asthebaby-boomergenerationcontemplatestheprospectoftheZimmerframetherehasneverbeenmoreinterestindelayingtheprocessofageing.Oneconsequencehasbeenan1riseinthepopularityofbrain-traininggames.Buthow2reallyisadailydoseofcrypticcrossword RobertWilsonaneuropsychologistatRushUniversityinChicagoandhiscolleaguesdecidedto3out4followingagroupofpeoplewithoutdementia.Participantswereaskedto5howfrequentlytheyengagedincognitively6activities.Theresearcherswerelookingforsuchthingsasreadingnewspapersbooksandmagazines7challenginggameslikechesslisteningtotheradioandwatchingtelevisionand8museums. ThegoodnewsastheyreportinNeurologyisthat9activityofthissortseemstoslowtherateof10declineinthosewithoutcognitive11.ThebadnewsisthatinthosewhodothendevelopAlzheimer’sdiseaseitisassociatedwithamorerapid12decline. Whatseemstobehappeningisthatcognitivestimulationhelps13theeffectoftheneurodegenerativelesionsassociatedwithdementia.Itdoesnot14makethemgoaway.Theycontinueto15sothatwhenthediseasedoeseventuallytake16therearemoreofthemaroundthanthereotherwisewouldbewhichresultsinamore17cognitivefalloff.Thatisnotamessageofdespair18becausethelengthoftimesomeonesuffersfromdementiaisthus19andtheirhealthylifeprolonged.Sothemessageis20onwiththecrosswords. 6
Asthebaby-boomergenerationcontemplatestheprospectoftheZimmerframetherehasneverbeenmoreinterestindelayingtheprocessofageing.Oneconsequencehasbeenan1riseinthepopularityofbrain-traininggames.Buthow2reallyisadailydoseofcrypticcrossword RobertWilsonaneuropsychologistatRushUniversityinChicagoandhiscolleaguesdecidedto3out4followingagroupofpeoplewithoutdementia.Participantswereaskedto5howfrequentlytheyengagedincognitively6activities.Theresearcherswerelookingforsuchthingsasreadingnewspapersbooksandmagazines7challenginggameslikechesslisteningtotheradioandwatchingtelevisionand8museums. ThegoodnewsastheyreportinNeurologyisthat9activityofthissortseemstoslowtherateof10declineinthosewithoutcognitive11.ThebadnewsisthatinthosewhodothendevelopAlzheimer’sdiseaseitisassociatedwithamorerapid12decline. Whatseemstobehappeningisthatcognitivestimulationhelps13theeffectoftheneurodegenerativelesionsassociatedwithdementia.Itdoesnot14makethemgoaway.Theycontinueto15sothatwhenthediseasedoeseventuallytake16therearemoreofthemaroundthanthereotherwisewouldbewhichresultsinamore17cognitivefalloff.Thatisnotamessageofdespair18becausethelengthoftimesomeonesuffersfromdementiaisthus19andtheirhealthylifeprolonged.Sothemessageis20onwiththecrosswords. 10
设fxy有二阶连续导数gxy=fexyx2+y2且证明gxy在00取得极值判断此极值是极大值还是极小值并求出此极值．
微分方程y’’+y=3x2+4+2cosx的特解形式可设为______
设在全平面上有则在下列条件中使fx1y1＜fx2y2成立的是______
证明
Asthebaby-boomergenerationcontemplatestheprospectoftheZimmerframetherehasneverbeenmoreinterestindelayingtheprocessofageing.Oneconsequencehasbeenan1riseinthepopularityofbrain-traininggames.Buthow2reallyisadailydoseofcrypticcrossword RobertWilsonaneuropsychologistatRushUniversityinChicagoandhiscolleaguesdecidedto3out4followingagroupofpeoplewithoutdementia.Participantswereaskedto5howfrequentlytheyengagedincognitively6activities.Theresearcherswerelookingforsuchthingsasreadingnewspapersbooksandmagazines7challenginggameslikechesslisteningtotheradioandwatchingtelevisionand8museums. ThegoodnewsastheyreportinNeurologyisthat9activityofthissortseemstoslowtherateof10declineinthosewithoutcognitive11.ThebadnewsisthatinthosewhodothendevelopAlzheimer’sdiseaseitisassociatedwithamorerapid12decline. Whatseemstobehappeningisthatcognitivestimulationhelps13theeffectoftheneurodegenerativelesionsassociatedwithdementia.Itdoesnot14makethemgoaway.Theycontinueto15sothatwhenthediseasedoeseventuallytake16therearemoreofthemaroundthanthereotherwisewouldbewhichresultsinamore17cognitivefalloff.Thatisnotamessageofdespair18becausethelengthoftimesomeonesuffersfromdementiaisthus19andtheirhealthylifeprolonged.Sothemessageis20onwiththecrosswords. 2
设齐次线性方程组其中a≠0b≠0n≥2．试讨论ab为何值时方程组仅有零解有无穷多组解在有无穷多组解时求出全部解并用基础解系表示全部解．
设A为三阶矩阵E为三阶单位阵αβ是两个线性无关的三维列向量且A的行列式｜A｜=0Aα=βAβ=α则行列式｜A+3E｜的值等于______
求极限
计算
设X1X2Xn为来自总体X的简单随机样本而x～B1p0＜p＜1记和．试求ⅠX的概率分布ⅡⅢET的值．
证明方程2x=x2+1有且仅有三个实根．
设Ω为区域x2+y2+z2≤1则______．
设A是各行元素之和均为0的三阶矩阵αβ是线性无关的三维列向量并满足Aα=3βAβ=3α．Ⅰ证明矩阵A和对角矩阵相似Ⅱ如α=0-11Tβ=10-1T求矩阵AⅢ用配方法化二次型xTAx为标准形并写出所用坐标变换．
求所有0+∞上的正连续函数gx使得对任意x＞0有
设fx有一阶连续导数且f0=0f’0=1则______.
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