N°38
A = 5/18 - 4/36 = 10/36 - 4/36 = 6/36 = 1/6
B = 17/12 - (11/12 - 4/12) = 17/12 - 7/12 = 10/12 = 5/6
C = 11/6 -2/3 +1/6 = 11/6 - 4/6 +1/6 = 12/6 - 4/6 = 8/6 = 4/3
D = 23/8 -3/4 -1/2 = 23/8 - 6/8 - 4/8 = 13/8
N°30
9h45 + 6h27 = 15h 72 ou 16h02 + 1h58 = 17h60 ou 18h
le n° 34 n'est pas visible.
