Bonjour
A = 9/20 x 25/2 = 225/40 = (5 x 45) / (5 x 8) = 45/8
B = 7/10 x 50/21 = 350/210 = (70 x 5) / (70 x 3) = 5/3
C = 7/27 x 9/5 = 63/135 = (9 x 7) / (9 x 15) = 7/15
D = 3/40 x 5/27 = 15/1 080 = (15 x 1) / (15 x 72) = 1/72
A = 64/63 x 49/40 = 3 136/2 520 = (56 x 56) / (56 x 45) = 56/45
B = 7/32 x 4/49 = 28/1 568 = (28 x 1) / (28 56) = 1/56
C = 63/20 x 16/27 = 1 008/540 = (36 x 28) / (36 x 15) = 28/15
D = 25/63 x 49/20 = 1 225/1 260 = (35 x 35) / (35 x 36) = 35/36
