【答案】《LinearAlgebraBeijingJiaotongUniversity》(北京交通大學(xué))章節(jié)期末慕課答案_第1頁
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【答案】《LinearAlgebraBeijingJiaotongUniversity》(北京交通大學(xué))章節(jié)期末慕課答案有些題目順序不一致,下載后按鍵盤ctrl+F進(jìn)行搜索Chapter1-MatricesandSystemsofEquationstest11.單選題:Let,and.Let,whereistheidentitymatrix.Inthefollowingfourstatements,thenumberofcorrectstatementsis______.(1)issymmetricmatrix(2)istheidentitymatrix(3)Aisinvertible(4)

選項(xiàng):

A、1

B、2

C、3

D、4

答案:【4】2.單選題:Letbeasystemofnlinearequationsinnunknownsandsupposethatandarebothsolutionsand.Thesystemhassolutions.ThematrixAis____.

選項(xiàng):

A、infinitelymany;nonsingular

B、infinitelymany;singular

C、two;nonsingular

D、two;singular

答案:【infinitelymany;singular】3.單選題:LetAbeanon-zeromatrixandIistheidentitymatrix.Ifwehave,then________.

選項(xiàng):

A、isnotinvertible,isnotinvertible

B、isnotinvertible,isinvertible

C、isinvertible,isinvertible

D、isinvertible,isnotinvertible

答案:【isinvertible,isinvertible】4.單選題:LetandB(Iistheidentitymatrix),then=.

選項(xiàng):

A、

B、

C、

D、

答案:【】5.單選題:LetA,B,Cbethematrices,whichsatifyABC=IandIistheidentitymatrix.Theremustbe.

選項(xiàng):

A、ACB=I

B、BCA=I

C、BAC=I

D、CBA=I

答案:【BCA=I】6.單選題:Ifand(thezeromatrix),then.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【錯(cuò)誤】7.單選題:IfAandBarematrices,then.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【錯(cuò)誤】8.單選題:If,thenAmustbeequaltoeitherIor-I.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【錯(cuò)誤】9.單選題:IfAandBarenonsingularmatrices,thenA+Bisalsononsingularand.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【錯(cuò)誤】10.單選題:Theproductoftwoelementarymatricesisanelementarymatrix

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【錯(cuò)誤】11.單選題:AnmatrixAisnonsingularifandonlyifthereducedrowechelonformofAisI(theidentitymatrix).

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】12.單選題:Everyhomogeneouslinearsystemisconsistent.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】13.單選題:Ifthereducedrowechelonformofinvolvesfreevariables,thenthesystemwillhaveinfinitelymanysolutions.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【錯(cuò)誤】14.單選題:Ifisamatrixand,thenmustbesingular.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】15.單選題:If,then

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【錯(cuò)誤】Chapter2-Determinantstest21.單選題:LetAbeamatrix.ItisknownthatthedeterminantofAis,andistheadjointmatrixofA.Then=__________.

選項(xiàng):

A、1

B、3

C、6

D、9

答案:【3】2.單選題:LetA,Bbematrices.Then.

選項(xiàng):

A、

B、

C、

D、

答案:【】3.單選題:IfAisanonsingularmatrix,thenis________and_______.

選項(xiàng):

A、nonsingular;>0

B、nonsingular;<0

C、singular;>0

D、singular;<0

答案:【nonsingular;>0】4.單選題:LetA,Bbe4×4matrices.Itisknownthatdet(A)=-2,det(B)=3.Thenthesmallestvalueamongthefollowingis________.

選項(xiàng):

A、

B、

C、

D、

答案:【】5.單選題:Let.Thenthecoefficientof,andtheconstantare=_______.

選項(xiàng):

A、-6,2,-6

B、-6,-2,6

C、-6,2,6

D、-6,-2,-6

答案:【-6,-2,-6】6.單選題:Ifxandyaretwodistinctvectorsin,andAx=Ay,thendet(A)=0.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】7.單選題:Atriangularmatrixisnonsingularifandonlyifitsdiagonalentriesareallnonzero.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】8.單選題:

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】9.單選題:implies

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【錯(cuò)誤】10.單選題:IfAisanonsingularmatrix,then.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】11.單選題:IfAisorthogonal,thendet(A)=1or-1.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】12.單選題:det(A-B)=det(A)?det(B)

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【錯(cuò)誤】13.單選題:AssumematricesA,B,Sgivenbelowareall.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】14.單選題:IfforsomenonsingularmatrixS,thendet(B)=det(A).

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】15.單選題:IfAandBarerowequivalentmatrices,thentheirdeterminantsareequal.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【錯(cuò)誤】Chapter3-VectorSpacestest31.單選題:Let,iftheadjointmatrixofAisand,then________.Hint:

選項(xiàng):

A、

B、

C、

D、

答案:【】2.單選題:Aisanmatrixandisann-dimensionalcolumnvector.If,thenthelinearequationsystem____________.

選項(xiàng):

A、musthaveinfinitelymanysolutions.

B、musthavenontrivialsolutions.

C、musthaveauniquesolution.

D、onlyhavethetrivialsolution.

答案:【musthavenontrivialsolutions.】3.單選題:Givenand,then_________.

選項(xiàng):

A、-3

B、-1

C、0

D、1

答案:【-3】4.單選題:GiventhevectorsDeterminewhichofthefollowingoptionsistrue,_______.

選項(xiàng):

A、andarelinearlyindependentin.

B、arelinearlyindependent,andtheyspan.

C、arelinearlyindependentandtheyformabasisfor.

D、arelinearlyindependentandtheyformabasisfor.

答案:【arelinearlyindependentandtheyformabasisfor.】5.單選題:Foreachsetthatfollows,_________isasubspaceof.

選項(xiàng):

A、

B、

C、

D、

答案:【】6.單選題:IfAisanm×nmatrix,thenAandhavethesamenullity.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【錯(cuò)誤】7.單選題:IfAisanm×nmatrix,thenAandhavethesamerank.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】8.單選題:IfspanavectorspaceV,thentheyarelinearlyindependent.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【錯(cuò)誤】9.單選題:Ifarelinearlyindependent,thentheyspan.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】10.單選題:IfAandBaretwomatrices,then

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】11.單選題:IfSandTaresubspacesofavectorspaceV,thenS∪TisasubspaceofV.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【錯(cuò)誤】12.單選題:Itispossibletofindapairoftwo-dimensionalsubspacesSandTofsuchthat

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【錯(cuò)誤】13.單選題:isasubspaceof.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【錯(cuò)誤】14.單選題:IfAisrowequivalenttoB,thenAandBhavethesamerowspace.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】15.單選題:IfSisasubspaceofavectorspaceV,thenSisavectorspace.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】Chapter4-LinearTransformationsTest41.單選題:IfmatricesAandBaresimilar,then_________iswrong.

選項(xiàng):

A、andaresimilar.

B、andarenotsimilar.

C、AandBcanberegardedasthesamelineartransformationmatrixunderdifferentbasis.

D、det(A)=det(B)

答案:【andarenotsimilar.】2.單選題:LetandletLbethelinearoperatorondefinedbyThenthematrixrepresentingLwithrespecttotheorderedbasisis_______.

選項(xiàng):

A、

B、

C、

D、

答案:【】3.單選題:Thekernelandrangeofthelinearoperatoronare.

選項(xiàng):

A、

B、

C、

D、

答案:【】4.單選題:isnotalineartransformationfrominto

選項(xiàng):

A、

B、

C、

D、

答案:【】5.單選題:LetAbeanmatrix,thentr(A)=tr(B)is_______forAandBaresimilar.

選項(xiàng):

A、asufficientcondition

B、anecessarycondition

C、anecessaryandsufficientcondition

D、anirrelevantcondition

答案:【anecessarycondition】6.單選題:Anytwomatriceswiththesametracearesimilar.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【錯(cuò)誤】7.單選題:Thesetofallvectorsxusedinthehomogeneouscoordinatesystemformsasubspaceof

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【錯(cuò)誤】8.單選題:Ifrotateseachvectorxinby45degreesinthecounterclockwisedirectionandthenre?ectstheresultingvectoraboutthey-axis,andifisatransformationthatdoesthesametwooperations,butinthereverseorder,then.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【錯(cuò)誤】9.單選題:Ifisalineartransformationandthen

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】10.單選題:If,arebothlinearoperatorsonavectorspaceV,thenisalsoalinearoperatoronV,whereisthemappingde?nedbyforall.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】11.單選題:LetA,BandCbematrices.IfAissimilartoBandBissimilartoC,thenAissimilartoC.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】12.單選題:Letbealineartransformation.If,thenthevectorsandmustbeequal.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【錯(cuò)誤】13.單選題:Letbealineartransformation.IfAisthestandardmatrixrepresentationof,thenanmatrixBwillalsobeamatrixrepresentationofLifandonlyifBissimilartoA.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】14.單選題:Letbeanorderedbasisfor.If,andhavethesamematrixrepresentationwithrespecttoE,then.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】15.單選題:Letbealineartransformation.Supposethatforsome.LetAbethematrixrepresentingLwithrespecttothestandardbasis,thenAisnonsingular.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【錯(cuò)誤】Chapter5-OrthogonalityTest51.單選題:LetAbea9×6matrixwithrankequalto5.Thenthedimensionofis____.

選項(xiàng):

A、9

B、6

C、4

D、5

答案:【4】2.單選題:Givenplane,andplane,thenthedistancebetweenthetwoplanesis________.

選項(xiàng):

A、7

B、

C、

D、3

答案:【】3.單選題:LetxandybevectorsinandletQbeann×northogonalmatrix.Ifz=Qxandw=Qythentherelationshipbetweentheanglebetweenzandwandtheanglebetweenxandyis________.

選項(xiàng):

A、>

B、<

C、=

D、Uncertain

答案:【=】4.單選題:LetandbevectorsinaninnerproductspaceV.Thentherelationofandis________.

選項(xiàng):

A、

B、

C、

D、

答案:【】5.單選題:Ifand,thenthescalarproductofxandyis_______.

選項(xiàng):

A、11

B、4

C、0

D、6

答案:【4】6.單選題:Ifxandyareunitvectorsinand=1,thenxandyarelinearlyindependent.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【錯(cuò)誤】7.單選題:Ifxandyarenonzerovectorsin,thenthevectorprojectionofxontoyisequaltothevectorprojectionofyontox.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【錯(cuò)誤】8.單選題:Ifisanorthonormalsetofvectorsinandthen(then×nidentitymatrix).

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【錯(cuò)誤】9.單選題:LetAbeanm×nmatrix,Bbeann×rmatrix,andC=AB.Thenisasubspaceof.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】10.單選題:IfQisanorthogonalmatrix,thenalsoisanorthogonalmatrix.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】11.單選題:IfAisanm×nmatrixsuchthat,thenthesystemAx=bwillhaveauniqueleastsquaressolution.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】12.單選題:LetAbeanmatrixofrank3,andletbbeanonzerovectorin,thenthesystemmustbeinconsistent.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】13.單選題:IfAisanm×nmatrix,thenandhavethesamerank.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】14.單選題:Itispossibleto?ndanonzerovectoryinthecolumnspaceofsuchthat.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【錯(cuò)誤】15.單選題:IfU,V,andWaresubspacesofandifU⊥VandV⊥W,thenU⊥W.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【錯(cuò)誤】Chapter6-EigenvaluesTest61.單選題:isanonzeroeigenvalueof,then_______isaneigenvalueoftheadjointmatrixofA.

選項(xiàng):

A、

B、

C、

D、

答案:【】2.單選題:Thematrixin______ispositivede?nite..

選項(xiàng):

A、

B、

C、

D、

答案:【】3.單選題:Thematrixassociatedwiththefollowingquadraticformis________.

選項(xiàng):

A、

B、

C、

D、

答案:【】4.單選題:Givenamatrix.LetbeaneigenvectorofA,thentheeigenvaluecorrespondingtovis_______;thevaluesofa,bare_______and_______.

選項(xiàng):

A、2;2;5

B、2;0;1

C、1;2;5

D、1;0;1

答案:【2;0;1】5.單選題:LetAbea2×2matrix.Iftr(A)=8anddet(A)=12,theeigenvaluesofAarelistedin_______.

選項(xiàng):

A、

B、

C、

D、

答案:【】6.單選題:IfAhaseigenvaluesofmultiplicitygreaterthan1,thenAmustbedefective.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【錯(cuò)誤】7.單選題:IfAandBaren×nmatriceswiththesameeigenvalues,thentheyaresimilar.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【錯(cuò)誤】8.單選題:IfAandBaresimilarmatrices,thentheyhavethesameeigenvalues.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】9.單選題:IfAisann×nmatrix,thenAandhavethesameeigenvectors.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【錯(cuò)誤】10.單選題:IfAisann×nmatrixwhoseeigenvaluesareallnonzero,thenAisnonsingular.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】11.單選題:IfAissymmetricpositivedefinite,thenthediagonalelementsofAmustallbepositive.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】12.單選題:isnonsingularforanydiagonalizablematrixA.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】13.單選題:Therankofann×nmatrixAisequaltothenumberofnonzeroeigenvaluesofA,whereeigenvaluesarecountedaccordingtomultiplicity.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【錯(cuò)誤】14.單選題:IfAisa6×6matrixofrank5andisaneigenvalueofmultiplicity5,thenAisdefective.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】15.單選題:IfA,Barebothn×nmatricesandλisanonzeroeigenvalueofAB,thenitisalsoaneigenvalueofBA.

選項(xiàng):

A、正確

B、錯(cuò)誤

答案:【正確】期末考試期末考試1.單選題:LetAandBbebothn-by-nmatrix.IfAB=O(Oisthen-by-nmatrixwhoseentriesareallzero),then________.

選項(xiàng):

A、A=OorB=O

B、A+B=O

C、det(A)=0ordet(B)=0

D、det(A+B)=0

答案:【det(A)=0ordet(B)=0】2.單選題:Letbesvectorsin.Thenarelinearlyindependentifandonlyif_______.

選項(xiàng):

A、anytwoofthevectorsinarelinearlyindependent

B、thereexistsavectorinthatcannotbelinearlyrepresentedbytherestofthevectors

C、anyvectorincannotbelinearlyrepresentedbytherestofthevectors

D、areallnonzerovectors

答案:【anyvectorincannotbelinearlyrepresentedbytherestofthevectors】3.單選題:LetAbeann-by-nmatrix.If,then________.

選項(xiàng):

A、

B、

C、

D、4

答案:【】4.單選題:Givenanon-homogeneouslinearequation.Letbetwodistinctsolutionsof,thenstatement_______iswrong.

選項(xiàng):

A、isoneofthesolutionsof

B、isoneofthesolutionsof

C、isoneofthesolutionsof

D、isoneofthesolutionsof

答案:【isoneofthesolutionsof】5.單

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