经济数学基础试题---线性代数计算题

网友回答

A= 求 (AA’)^-1
1 0 01 1 -1-1 0 1AA’ =1 0 03 1 -2-2 0 -1(AA’,E) =
1 0 0 1 0 03 1 -2 0 1 0
-2 0 -1 0 0 1
r2-3r1,r2+2r1
1 0 0 1 0 00 1 -2 -3 1 0
0 0 -1 2 0 1
r3*(-1),r2+2r3
1 0 0 1 0 00 1 0 -7 1 -2
0 0 1 -2 0 -1
所以 (AA’)^-1 =
1 0 0-7 1 -2-2 0 -1