Réponse :
Explications étape par étape
Bonjour
Rond : 38/18 - 2
= 38/18 - (2 x 18)/18
= 38/18 - 36/18
= 2/18
= 2/(2 x 9)
= 1/9 => I
Croix : 11/15 - 14/15 + 4/15
= 15/15 - 14/15
= 1/15 => O
Carré : fraction représentant 20%
= 20/100
= 2/10
= 2/(2 x 5)
= 1/5 => E
Étoile : 1 - 18/19
= 19/19 - 18/19
= 1/19 => S
Cœur : 1/2 - 1/6 - 2/7
= (1 x 3 x 7)/(2 x 3 x 7) - (1 x 7)/(6 x 7) - (2 x 6)/(7 x 6)
= 21/42 - 7/42- 12/42
= 21/42 - 19/42
= 2/42
= 2/(2 x 21)
= 1/21 => U
Triangle : -2/3 + 13/18
= (-2 x 6)/(3 x 6) + 13/18
= -12/18 + 13/18
= 1/18 => R
Mot mystère :
S - O - U - R - I - R - E
