用初等变换法求下列矩阵的逆矩阵：{1 2 3,2 2 1,3 4 3}

1 2 3 1 0 02 2 1 0 1 03 4 3 0 0 1--->1 2 3 1 0 00 -2 -5 -2 1 00 -2 -6 -3 0 1-->1 0 -2 -1 1 00 -2 -5 -2 1 00 0 -1 -1 -1 1-->1 0 0 1 3 -20 -2 0 3 6 -50 0 -1 -1 -1 1-->1,0,0,1,3,-20,1,0,-3/2,-3,5/20,0,1,...