Répondre :
Il y a plusieurs possibilités :
(4+1) x (2 + 1) = 5 x 3 = 15
(2 +1) x (3 + 2) = 3 x 5 = 15
(7 + 8) x (0 + 1) = 15 x 1 = 15
(4+1) x (2 + 1) = 5 x 3 = 15
(2 +1) x (3 + 2) = 3 x 5 = 15
(7 + 8) x (0 + 1) = 15 x 1 = 15