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It’s not that we thought things were fine. It’s just that this year there were no fixes to the messe...
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Booksarethemostimportantrecordswe______man’sthough
keep up
keep of
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July212007wasatypicalEnglishsummer’sday—itraine
She valued human feelings more than before.
She realized she almost didn’t need possessions.
She found Christmas gifts no longer badly needed.
She thought her own home was the most important.
Ifyoulookupthewordcreateinthedictionaryyouwillfind
Accordingtothedictionarydefinitionofcreateordinary
Iknowit’snormalforsuchathingtohappenbutwe______iti
need have avoided
could have avoided
will have avoided
had avoided
That’stheonlythingwecandonow.
when
who
where
that
Accordingtothedictionarydefinitionofcreateordinary
Ifyoulookupthewordcreateinthedictionaryyouwillfind
Wemadeadetailedplanforthisyear'swork______isawiset
this
that
what
which
Ifyoulookupthewordcreateinthedictionaryyouwillfind
Never________Lisawouldarrivebutsheturnedupatthelas
did we think
have we thought
we thought
we have thought
Accordingtothedictionarydefinitionofcreateordinary
Ifyoulookupthewordcreateinthedictionaryyouwillfind
Accordingtothedictionarydefinitionofcreateordinary
RecentlyIreadanarticleinamagazine.Itwasofamotherwh
NeverLisawouldarrivebutsheturnedupatthelastminutE.
did we think
have we thought
we thought
we have thought
阅读理解Onceuponatimethebirdsflewovertheworldtheysawth
InEnglandwehaveasaying:It’sthethoughtthat_______.
minds
counts
needs
sounds
Ifyoulookupthewordcreateinthedictionaryyouwillfind
Iknowit’snormalforsuchathingtohappenbutwe________i
need have avoided
could have avoided
will have avoided
had avoided
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已知α是齐次方程组Ax=0的基础解系其中则a=______.
试讨论n维向量α1α2αs的线性相关性其中i=12s.
设AB均是n阶矩阵若E-AB可逆证明E-BA可逆.
设则|2A-1+E|=______.
已知α1α2α3是非齐次线性方程组3个不同的解证明Ⅰα1α2α3中任何两个解向量均线性无关Ⅱ如果α1α2α3线性相关则α1-α2α1-α3线性相关.
Ⅰ设AB均为n阶非零矩阵且A2+A=0B2+B=0证明λ=-1必是矩阵A与B的特征值Ⅱ若AB=BA=0α与β分别是A与B属于特征值λ=-1的特征向量证明向量组αβ线性无关.
已知向量组与向量组有相同的秩且β3可由α1α2α3线性表出求ab的值.
设向量组Ⅰα1α2αs和Ⅱβ1β2βs如果Ⅰ可由Ⅱ线性表出且秩rⅠ=rⅡ证明Ⅱ可由Ⅰ线性表出.
已知α1α2α3α4是3维列向量矩阵A=α1α22α3-α4+α2B=α3α2α1C=α1+2α22α2+3α4α4+3α1若|B|=-5|C|=40则|A|=______.
已知矩阵中a<0且齐次方程组Ax=0有非零解A*是A的伴随矩阵则齐次方程组A*x=0的通解是______.
已知β=02-1aT可以由α1=1-23-4Tα2=01-11Tα3=13a1T线性表出则a=______.
设A是n阶矩阵ξ1ξ2ξt是齐次方程组Ax=0的基础解系若存在ηi使Aηi=ξ1i=12t证明向量组ξ1ξ2ξsη1η2ηt线性无关.
设矩阵A的伴随矩阵且矩阵AB满足+12E则矩阵B=______.
设n维向量α1α2αs线性无关而α1α2αsβ线性相关证明β可以由α1α2αs线性表出且表示方法唯一.
已知向量组α1=1113Tα2=-a-123Tα3=12a-137Tα4=-1-1a-1-1T的秩为3则a=______.
已知λ1λ2是矩阵A两个不同的特征值α1α2αs和β1β2βt分别是矩阵A属于特征值λ1和λ2的线性无关的特征向量.证明α1α2αsβ1β2βt线性无关.
已知矩阵X满足XA-AB=AXA-ABA则X3=______.
设ABAB-E均为n阶可逆矩阵Ⅰ证明A-B-1可逆Ⅱ求A-B-1-1-A-1的逆矩阵.
已知α1α2αt是齐次方程组Ax=0的基础解系判断并证明α1+α2α3+α3αt-1+αtαt+α1是否为Ax=0的基础解系.
若矩阵B是3阶非零矩阵满足AB=0则t=______.
已知n维向量α1α2α3线性无关且向量β可由α1α2α3中的任何两个向量线性表出证明β=0.
设求An.
设矩阵A*是矩阵A的伴随矩阵若rA*=1且行列式|A+E|=8则a=______.
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