Question

电大经济数学基础（微积分）试卷求答案

Answer 1

(I+A,I) =

1 1 0 1 0 0

2 1 -1 0 1 0

3 4 2 0 0 1

r2-2r1,r3-3r1

1 1 0 1 0 0

0 -1 -1 -2 1 0

0 1 2 -3 0 1

r1+r2,r3+r2,r2*(-1)

1 0 -1 -1 1 0

0 1 1 2 -1 0

0 0 1 -5 1 1

r1+r3,r2-r3

1 0 0 -6 2 1

0 1 0 7 -2 -1

0 0 1 -5 1 1

(I+A)^-1 =

-6 2 1

7 -2 -1

-5 1 1