Réponse :
Bonsoir,
Exo 31:
A = ( 14 - (2+3)) x 2 = (14-5) x 2 = 9 x 2 = 18
B = 12 / ((4+2)x2 = 12 / (6x2) = 12 / 12 = 1
C = (8 - (7-2)) x 3 = (8-5) x 3 = 3 x 3 = 9
D = 0.5 x (38-(7+3)) = 0.5 x (38-10) = 0.5 x 28 = 14
Exo 33 :
A = 225 - ((15+7) x 10 -2) = 225 - (22x10-2) = 225 - (220-2) = 225 - 218 = 7
B = 15 + 7 x (100-20) /8 +2 = 15 + 7x 80 / 8 +2 = 15 + 560 /8 +2 = 15 + 70
+2 = 87
C = (10 x 3.2 - (79-71)) /6 = (10 x 3.2 - 8) /6 = (32-8)/6 = 24 / 6 = 4
