Bonjour
A = - 18/7 + 11/7
A = - 7/7
A = - 1
B = 8,5/1,1 - 9,5/1,1
B = - 1/1,1
C = 15,5/8 - 8,8/8
C = 6,7/8
D = 19,9/2 - 1,2/2
D = 18,7/2.
