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)_(3)=3, 4(x)_(1)+3(x)_(2)+3(x)_(3)=-1 .-|||-。

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