I apologize for this error : I had inversed 6/5 and 5/4. Correction :
-1 5/4 0 0 0 1 5/4 3/2 15/8 9/4
0 -1 6/5 0 0 8/5 1 6/5 3/2 9/5
0 0 -1 5/4 0 -- inversion --> 4/3 5/3 1 5/4 3/2
0 0 0 -1 6/5 16/15 4/3 8/5 1 6/5
8/9 0 0 0 -1 8/9 10/9 4/3 5/3 1
Pierre