[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)_(3)-2(x)_(4)=0 (x)_(1)-(x)_(2)-4(x)_(3)- .

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