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解线性方程组,其中a为常数。
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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_____
已知线性方程组[*]有非零公共解求a的值及其所有公共解.
对n元线性方程组下列命题中正确的是______
若r(A)=n,则线性方程组AX=b有唯一解
若AX=0只有零解,则非齐次方程组AX=b有唯一解
若AX=0有两个不同的解,则非齐次方程组AX=b有无穷多解
若AX=b有两个不同的解,则非齐次方程组AX=b有无穷多解
已知齐次线性方程组Ⅰ的基础解系为α1=1257Tα2=3-117Tα3=-23420T齐次线性方程组
解线性方程组其中a为常数
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A=[aij]是三阶正交矩阵其中a33=-1b=005T则线性方程组Ax=b的解是______.
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n阶矩阵A的伴随矩阵A*≠0若ξ1ξ2ξ3ξ4是非齐次线性方程组Ax=b的互不相等的解则对应的齐次
不存在
仅含一个非零解向量
含有两个线性无关的解向量
含有三个线性无关的解向量
已知A是2×4阶矩阵齐次线性方程组Ax=0的基础解系是η1=1302Tη2=12-13T又知齐次线性
若线性方程组的增广矩阵为则该线性方程组的解是.
n元线性方程组Ax=b有唯一解的充要条件是
A为可逆的方阵
齐次线性方程组AX=0只有零解
A的行向量组线性无关
矩阵A的列向量线性无关,且向量b可由A的列向量组线性表示
设有齐次线性方程组[*]试问a取何值时该方程组有非零解.并求出其通解.
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.
n元线性方程组Ax=b有唯一解的充要条件是
A为可逆的方阵
齐次线性方程组AX=0只有零解
A的行向量组线性无关
矩阵A的列向量线性无关,且向量b可由A的列向量组线性表示-
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+
设n元齐次线性方程组Ax=0的一个基础解系中线性无关的解向量个数是n则A=______.
n元线性方程组Ax=b有唯一解的充要条件是
(A) A为可逆的方阵
(B) 齐次线性方程组AX=0只有零解
(C) A的行向量组线性无关
(D) 矩阵A的列向量线性无关,且向量b可由A的列向量组线性表示-
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