第1个回答 2013-09-09
解: (I-A,B) = 0 -1 -3 2 5-2 -2 -7 0 1-3 -4 -8 -3 0r2-r3 0 -1 -3 2 5 1 2 1 3 1-3 -4 -8 -3 0r3+3r2 0 -1 -3 2 5 1 2 1 3 1 0 2 -5 6 3r2+2r1,r3+2r1 0 -1 -3 2 5 1 0 -5 7 11 0 0 -11 10 13r1*(-1),r3*(-1/11),r1<->r2 1 0 -5 7 11 0 1 3 -2 -5 0 0 1 -10/11 -13/11r1+5r3,r2-3r31 0 0 27/11 56/11 0 1 0 8/11 -16/11 0 0 1 -10/11 -13/11(I-A)^-1B = 27/11 56/11 8/11 -16/11-10/11 -13/11