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设线性方程组AX=kβ1+β2有解,其中则k为( )
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设ADjj=12n分别为线性方程组AX=b的n阶系数矩阵和系数矩阵第了列元素换成常数项后对应的行列式
若
A
=o,则线性方程组有无穷多解
若
A
=0,且D
j
=0(j=1,2,…,72),则线性方程组有无穷多解
若
A
=0,则线性方程组无解
若
A
≠0,则线性方程组有唯一解
设A=α1α2αn是m×n矩阵b是m维列向量则下列命题正确的是
如果非齐次线性方程组Ax=b有唯一解,则m=n且
A
≠0.
如果齐次线性方程组Ax=0有非零解,则Ax=b有无穷多解.
如果α
1
,α
2
,…,α
n
线性无关,则Ax=b有唯一解.
如果对任何b,方程组Ax=b恒有解,则A的行向量组线性无关.
设A是m×n矩阵则下列4个命题①若r
=m,则非齐次线性方程组Ax=b必有解;
② 若r(A)=m,则齐次方程组Ax=0只有零解;
③ 若r(A)=n,则非齐次线性方程组Ax=b有唯一解;
④ 若r(A)=n,则齐次方程组Ax=0只有零解
中正确的是(A) ①③
①④
②③
②④
设一个非齐次线性方程组的全部解为其中k1k2为任意常数则满足此条件的一个非齐次线性方程组为_____
设A为秩是r的m×n矩阵非齐次线性方程组Ax=b有解的充分条件是
r=m.
m=n.
r=n.
m<n.
设4元齐次线性方程组Ⅰ为 而已知另一4元齐次线性方程组Ⅱ的一个基础解系为 α1=2-1a+21T
设矩阵 已知线性方程组Ax=β有解但不唯一试求1a的值2正交矩阵Q使QTAQ为对角矩阵.
设n阶矩阵A的各行元素之和均为零且A的秩为n-1则线性方程组AX=0的通解为______.
设A为m×n矩阵r
=m,b≠0,则线性方程组Ax=b(A) 可能无解.
一定无解.
可能有解.
一定有解.
设线性方程组AX=kβ1+β2有解其中[*]则k为
1
-1
2
-2
设一个非齐次线性方程组的全部解为其中k1k2为任意常数则满足此条件的一个非齐次线性方程组为_____
设矩阵A=α1α2α3线性方程组Ax=β的通解是1-20T+k211T若B=α1α2α3β-5α3求
若线性方程组的增广矩阵为则该线性方程组的解是.
设A是2阶矩阵非齐次线性方程组AX=b有通解X=k-21T+3-4Tk为任意常数b=32T又设β5-
2010设齐次线性方程组当方程组有非零解时k值为
-2或3
2或3
2或-3
-2或-3
设A是m×n矩阵则下列4个命题①若rA=m则非齐次线性方程组Ax=b必有解②若rA=m则齐次方程组A
①③.
①④.
②③.
②④.
设ξ1=1-2100Tξ2=2-4110Tξ3=-4410-1T是齐次线性方程组的一个基础解系求此齐
设A是m×n矩阵非齐次线性方程组Ax=b有解的充分条件是
秩r(A)=min(m,n).
A的行向量组线性无关.
m<n.
A的列向量组线性无关.
设α是线性方程组AX=b的解β1β2βs是其对应的齐次线性方程组的基础解系令γ1=α+β1γ2=α+
非齐次线性方程组有解时a应取下列何值?
-2
-4
-6
-8
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请阅读下面材料 __在十六大__要尊重和保护一切有益于人民和社会的劳动不论是体力劳动还是脑力劳动不论是简单劳动还是复杂劳动一切为我国社会主义现代化建设做出贡献的劳动都是光荣的都应谊得到承认和尊重要确立劳动资本技术和管理等生产要素按贡献参与分配的原则完善按劳分配为主体多种分配方式并存的分配制度 运用马克思主义政治经济学中关于价值创造和价值分配的理论分析我国现行阶段的分配制度
Directions:Readthefollowingtext.Choosethebestwordsfor eachnumberedblankandmarkABCorDonANSWERSHEET1. Mostplantscanmaketheirownfood fromsunlight1somehavediscoveredthatstealingisan easierwaytoliveThousandsofplantspeciesgetby2 photosynthesizingandover400ofthesespeciesseemtoliveby pilferingsugarsfromanunderground3offungi真菌.But in4ahandfuloftheseplantshasthismodusoperandibeen tracedtoarelativelyobscurefungus.Tofindouthow5 are6mycologistMartinBidartondoofthe UniversityofCaliforniaatBerkeleyandhisteamlookedintheirroots.What theyfoundwere7ofacommontypeoffungusso 8thatitisfoundinnearly70percentofallplants.The presenceofthiscommonfungusintheseplantsnotonly9 athowtheysurvivesaysBidartondobutalsosuggeststhat manyordinaryplantsmightprosperfromalittlelootingtoo. Plantshave10relationstogetwhattheyneedto survive.Normal11plantscanmaketheirowncarbohydrates throughphotosynthesisbuttheystillneedminerals.Mostplantshave 12asymbioticrelationshipwitha13 networkofwhatarecalledmycorrhizalfungiwhichliesbeneaththe forest14.Thefungihelpgreenplantsabsorbminerals throughtheirrootsand15theplantsnormally 16thefungiwithsugarsorcarbon.Withanumberofplants sharingthesamefungalwebitwasperhaps17thatafew cheaters—dubbedepiparasites—wouldevolvetobeatthesystem.18 theseplantsreversedtheflowofcarbon19it intotheirrootsfromthefungi20releasingitas payment.
决定一定时期内流通中所需货币量的因素主要有
我国发展对外经济关系的基础和主要内容是
市场经济和商品经济的相互关系是
一贯煎可用于治疗下列哪些病证
商品流通公式与资本流通公式的区别在于
产业资本划分为货币资本生产资本商品资本的依据是资本各个部分
Directions:Readthefollowingtext.Choosethebestwordsfor eachnumberedblankandmarkABCorDonANSWERSHEET1. Mostplantscanmaketheirownfood fromsunlight1somehavediscoveredthatstealingisan easierwaytoliveThousandsofplantspeciesgetby2 photosynthesizingandover400ofthesespeciesseemtoliveby pilferingsugarsfromanunderground3offungi真菌.But in4ahandfuloftheseplantshasthismodusoperandibeen tracedtoarelativelyobscurefungus.Tofindouthow5 are6mycologistMartinBidartondoofthe UniversityofCaliforniaatBerkeleyandhisteamlookedintheirroots.What theyfoundwere7ofacommontypeoffungusso 8thatitisfoundinnearly70percentofallplants.The presenceofthiscommonfungusintheseplantsnotonly9 athowtheysurvivesaysBidartondobutalsosuggeststhat manyordinaryplantsmightprosperfromalittlelootingtoo. Plantshave10relationstogetwhattheyneedto survive.Normal11plantscanmaketheirowncarbohydrates throughphotosynthesisbuttheystillneedminerals.Mostplantshave 12asymbioticrelationshipwitha13 networkofwhatarecalledmycorrhizalfungiwhichliesbeneaththe forest14.Thefungihelpgreenplantsabsorbminerals throughtheirrootsand15theplantsnormally 16thefungiwithsugarsorcarbon.Withanumberofplants sharingthesamefungalwebitwasperhaps17thatafew cheaters—dubbedepiparasites—wouldevolvetobeatthesystem.18 theseplantsreversedtheflowofcarbon19it intotheirrootsfromthefungi20releasingitas payment.
社会资本扩大再生产的前提条件是
现代产权制度的特征主要有
寒哮发作期可根据临床情况选用哪些方治疗
价值转化成生产价格后价值价格和生产价格的关系是
利润率的变动与
下列工资属于国民收入初次分配的是
症见心痛彻背背痛彻心痛剧而无休止身寒肢冷喘息不得卧脉象沉紧其治疗可选用哪几方治疗
资本主义农场的劳动资料包括
Directions:Readthefollowingtext.Choosethebestwordsfor eachnumberedblankandmarkABCorDonANSWERSHEET1. Mostplantscanmaketheirownfood fromsunlight1somehavediscoveredthatstealingisan easierwaytoliveThousandsofplantspeciesgetby2 photosynthesizingandover400ofthesespeciesseemtoliveby pilferingsugarsfromanunderground3offungi真菌.But in4ahandfuloftheseplantshasthismodusoperandibeen tracedtoarelativelyobscurefungus.Tofindouthow5 are6mycologistMartinBidartondoofthe UniversityofCaliforniaatBerkeleyandhisteamlookedintheirroots.What theyfoundwere7ofacommontypeoffungusso 8thatitisfoundinnearly70percentofallplants.The presenceofthiscommonfungusintheseplantsnotonly9 athowtheysurvivesaysBidartondobutalsosuggeststhat manyordinaryplantsmightprosperfromalittlelootingtoo. Plantshave10relationstogetwhattheyneedto survive.Normal11plantscanmaketheirowncarbohydrates throughphotosynthesisbuttheystillneedminerals.Mostplantshave 12asymbioticrelationshipwitha13 networkofwhatarecalledmycorrhizalfungiwhichliesbeneaththe forest14.Thefungihelpgreenplantsabsorbminerals throughtheirrootsand15theplantsnormally 16thefungiwithsugarsorcarbon.Withanumberofplants sharingthesamefungalwebitwasperhaps17thatafew cheaters—dubbedepiparasites—wouldevolvetobeatthesystem.18 theseplantsreversedtheflowofcarbon19it intotheirrootsfromthefungi20releasingitas payment.
Directions:Readthefollowingtext.Choosethebestwordsfor eachnumberedblankandmarkABCorDonANSWERSHEET1. Mostplantscanmaketheirownfood fromsunlight1somehavediscoveredthatstealingisan easierwaytoliveThousandsofplantspeciesgetby2 photosynthesizingandover400ofthesespeciesseemtoliveby pilferingsugarsfromanunderground3offungi真菌.But in4ahandfuloftheseplantshasthismodusoperandibeen tracedtoarelativelyobscurefungus.Tofindouthow5 are6mycologistMartinBidartondoofthe UniversityofCaliforniaatBerkeleyandhisteamlookedintheirroots.What theyfoundwere7ofacommontypeoffungusso 8thatitisfoundinnearly70percentofallplants.The presenceofthiscommonfungusintheseplantsnotonly9 athowtheysurvivesaysBidartondobutalsosuggeststhat manyordinaryplantsmightprosperfromalittlelootingtoo. Plantshave10relationstogetwhattheyneedto survive.Normal11plantscanmaketheirowncarbohydrates throughphotosynthesisbuttheystillneedminerals.Mostplantshave 12asymbioticrelationshipwitha13 networkofwhatarecalledmycorrhizalfungiwhichliesbeneaththe forest14.Thefungihelpgreenplantsabsorbminerals throughtheirrootsand15theplantsnormally 16thefungiwithsugarsorcarbon.Withanumberofplants sharingthesamefungalwebitwasperhaps17thatafew cheaters—dubbedepiparasites—wouldevolvetobeatthesystem.18 theseplantsreversedtheflowofcarbon19it intotheirrootsfromthefungi20releasingitas payment.
垄断利润是垄断资本家获得的
Directions:Readthefollowingtext.Choosethebestwordsfor eachnumberedblankandmarkABCorDonANSWERSHEET1. Mostplantscanmaketheirownfood fromsunlight1somehavediscoveredthatstealingisan easierwaytoliveThousandsofplantspeciesgetby2 photosynthesizingandover400ofthesespeciesseemtoliveby pilferingsugarsfromanunderground3offungi真菌.But in4ahandfuloftheseplantshasthismodusoperandibeen tracedtoarelativelyobscurefungus.Tofindouthow5 are6mycologistMartinBidartondoofthe UniversityofCaliforniaatBerkeleyandhisteamlookedintheirroots.What theyfoundwere7ofacommontypeoffungusso 8thatitisfoundinnearly70percentofallplants.The presenceofthiscommonfungusintheseplantsnotonly9 athowtheysurvivesaysBidartondobutalsosuggeststhat manyordinaryplantsmightprosperfromalittlelootingtoo. Plantshave10relationstogetwhattheyneedto survive.Normal11plantscanmaketheirowncarbohydrates throughphotosynthesisbuttheystillneedminerals.Mostplantshave 12asymbioticrelationshipwitha13 networkofwhatarecalledmycorrhizalfungiwhichliesbeneaththe forest14.Thefungihelpgreenplantsabsorbminerals throughtheirrootsand15theplantsnormally 16thefungiwithsugarsorcarbon.Withanumberofplants sharingthesamefungalwebitwasperhaps17thatafew cheaters—dubbedepiparasites—wouldevolvetobeatthesystem.18 theseplantsreversedtheflowofcarbon19it intotheirrootsfromthefungi20releasingitas payment.
垄断资本主义最根本的经济特征是
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