经济数学基础试题-线性代数计算题

A= find (aa')-1

1 0 0

1 1 -1

-1 0 1

解决方案:AA' =

1 0 0

3 1 -2

-2 0 -1

(AA ',E)= 1

1 0 0 1 0 0

3 1 -2 0 1 0

-2 0 -1 0 0 1

r2-3r1,r2+2r1

1 0 0 1 0 0

0 1 -2 -3 1 0

0 0 -1 2 0 1

R3 *(1),r2+2r3

1 0 0 1 0 0

0 1 0 -7 1 -2

0 0 1 -2 0 -1

所以(aa')-1 =

1 0 0

-7 1 -2

-2 0 -1

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