用矩阵的初等变换求如下矩阵的逆矩阵 (1 2 -1 3 4 -2 5 -4 1)
问题描述:
用矩阵的初等变换求如下矩阵的逆矩阵 (1 2 -1 3 4 -2 5 -4 1)
答
(A,E) =1 2 -1 1 0 03 4 -2 0 1 05 -4 1 0 0 1r3-2r1-r2,r2-3r11 2 -1 1 0 00 -2 1 -3 1 00 -12 5 -2 -1 1r1+r2,r3-6r21 0 0 -2 1 00 -2 1 -3 1 00 0 -1 16 -7 1r2+r31 0 0 -2 1 00 -2 0 13 -6 10 0 -1 16 -7 1r2*(-...