1.用消元法解下列线性方程组:-|||-(3) ) (x)_(1)-(x)_(2)+(x)_(3)-(x)_(4)=1 (x)_(1)-(x)_(2)-(x)_(3)+(x)_(4)=0 (x)_(1)-(x)_(2)-2(x)_(3)+2(x)_ .

1.用消元法解线性方程组.-|||- ) (x)_(1)+2(x)_(2)+(x)_(3)=3, -2(x)_(1)+(x)_(2)-(x)_(3)=-3 (

用消元法解线性方程组 ) (x)_(1)+2(x)_(3)-4(x)_(3)=1 (x)_(2)+(x)_(3)=0 -(x)_(3)=2 .用消元法解线性

用消元法解下列线性方程组:-|||- x1+3x2+5x3-4x4 =1, x1+3x2+2x3-2x4+x5=-1, x1-2x2+x3-x4-x5=3, x

求解下列齐次线性方程组-|||- ) (x)_(1)+2(x)_(2)-(x)_(3)+(x)_(4)=1 2(x)_(1)+4(x)_(2)-2(x)_(3

4.利用逆矩阵解下列线性方程组:-|||-(1) ) (x)_(1)-(x)_(2)+2(x)_(3)=1, -2(x)_(1)-(x)_(2)-2(x)_

13.求解下列齐次线性方程组:-|||-(1) ) (x)_(1)+(x)_(2)+2(x)_(3)-(x)_(4)=0, 2(x)_(1)+(x)_(2)

13.求解下列齐次线性方程组:-|||-(1) ) (x)_(1)+(x)_(2)+2(x)_(3)-(x)_(4)=0, 2(x)_(1)+(x)_(2)

6.求解下列齐次线性方程组.-|||-(1) ) (x)_(1)+(x)_(2)+2(x)_(3)-(x)_(4)=0, 2(x)_(1)+(x)_(2)+

例4 讨论线性方程组-|||- ) (x)_(1)+(x)_(2)+2(x)_(3)+3(x)_(4)=1 (x)_(1)+3(x)_(2)+6(x)_(3)

求解下列非齐次线性方程组:-|||-(1) ) 4(x)_(1)+2(x)_(2)-(x)_(3)=2, 3(x)_(1)-(x)_(2)+2(x)_(3)