Répondre :
A = 1/9 - 1/6
A = 6/54 - 9/54
A = -3/54
B = 7/12 + 5/18
B = 126/216 + 60/216
B = 186/216
→ simplification par 6
B = 31/36
C = -20/7 + 2/7
C = -18/7
A = 6/54 - 9/54
A = -3/54
B = 7/12 + 5/18
B = 126/216 + 60/216
B = 186/216
→ simplification par 6
B = 31/36
C = -20/7 + 2/7
C = -18/7