10 OPTION BASE 1
15 DIM A(3,3),C(3,3), X(3,3)
25 FOR R=1 TO 3
26 FOR C=1 TO 3
27 READ A(R,C)
28 NEXT C
29 NEXT R
30 MAT C=INV(A)
35 MAT PRINT C
50 MAT X=C*A
60 MAT PRINT X
80 DATA 1,2,3,2,4,5,3,5,6,3,4,5
100 END 
