Bonsoir
a)
405/450 = (45 x 9) / (45 x 10) = 9/10 → T
840/1 050 =(210 x 4) / (210 x 5) = 4/5 → I
360/432 = (72 x 5) / (72 x 6) = 5/6 → E
420/480 = (60 x 7) / (60 x 8) = 7/8 → R
1 056/1 188 = (132 x 8) / (132 x 9) = 8/9 → S
Le mot est : TIERS.
b)
Q → 6/7
U → 10/11
A → 2/3
R → 7/8
T → 9/10.
