9.用改进平方根法解线性方程组-|||- ) 2(x)_(1)-(x)_(2)+(x)_(3)=4, -(x)_(1)-2(x)_(2)+3(x)_(3)=5 (x)_(1)+3(x)_(2)+(x)_(3)=6。 .

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

解线性方程组_(1)-2(x)_(2)+(x)_(3)=-2-|||-__ __-|||-(x)_(1)+(x)_(2)-3(x)_(3)=1-|||--(x)

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

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)_(

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

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)_

解下列线性方程组 ) (x)_(1)+2(x)_(2)+3(x)_(3)=1 2(x)_(1)+2(x)_(2)+5(x)_(3)=2 3(x)_(1)+5(

7.用克莱姆法则解线性方程组-|||- ) (x)_(1)+(x)_(2)+(x)_(3)+(x)_(4)=5 (x)_(1)+2(x)_(2)-(x)_(3

给定线性方程组 ) (x)_(1)+(x)_(2)+(x)_(3)=a-3 (x)_(1)+a(x)_(2)+(x)_(3)=-2 (x)_(1)+(x)_(