求四阶矩阵的逆矩阵
问题描述：
求四阶矩阵的逆矩阵
答
(A,E) =1 3 -5 7 1 0 0 00 1 2 3 0 1 0 00 0 1 2 0 0 1 00 0 0 1 0 0 0 1r1-7r4,r2-3r4,r3-2r41 3 -5 0 1 0 0 -70 1 2 0 0 1 0 -30 0 1 0 0 0 1 -20 0 0 1 0 0 0 1r1+5r3,r2-2r31 3 0 0 1 0 5 -170 1 0 0 0 1 -2 10 ...