题目4.利用逆矩阵解线性方程组-|||-(1) ) (x)_(1)-(x)_(2)-(x)_(3)=2 2(x)_(1)-(x)_(2)-3(x)_(3)=1. 3(x)_(1)+2(x)_(2)-5(x)_(3)=0 .题目解答答案