3.求解线性方程组 ) (x)_(1)+2(x)_(2)-(x)_(3)+2(x)_(4)=1 2(x)_(1)+4(x)_(2)+(x)_(3)+(x)_(4)=5 -(x)_(1)-2(x)_(2)-2(x)_(3) .

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

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

[题目]求解齐次线性方程组:-|||- ) (x)_(1)+2(x)_(2)+2(x)_(3)+(x)_(4)=0 2(x)_(1)+(x)_(2)-2(x)

设非齐次线性方程组 ) (x)_(1)+2(x)_(3)+(x)_(4)=2 (x)_(1)+(x)_(2)+(x)_(3)+4(x)_(4)=a (x)_(

求非齐次线性方程组 ) (x)_(1)+(x)_(2)-3(x)_(3)-(x)_(4)=1 3(x)_(1)-(x)_(2)-3(x)_(3)+4(x)_(

求线性方程组_(1)+(x)_(2)+(x)_(3)+(x)_(4)=0-|||-_(2)+2(x)_(3)+2(x)_(4)=1-|||-_(1)+2(x)_

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)

如果线性方程组 ) 3(x)_(1)+k(x)_(2)-(x)_(3)=1 4(x)_(2)-(x)_(3)=2 4(x)_(2)+k(x)_(3)=3 .

解线性方程组: (x)_(1)+(x)_(2)-5(x)_(3)+(x)_(4)=8 (x)_(1)+(x)_(2)-5(x)_(3)+(x

已知非齐次线性方程组 ) (x)_(1)-5(x)_(2)+2(x)_(3)-3(x)_(4)=11 5(x)_(1)+3(x)_(2)+6(x)_(3)-(