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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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