Réponse :
A = 5(7+2) = 5*9 = 45
B = (7-5)(2+6) = 2*8 = 16
C = 2(7+3)(13-9) = 2(10)(4) = 2*40= 80
D = 5[2(7+4)] = 5[2*11] = 5(22) = 110
E = 2(8+7) - 3(9-5) + 9(12-8) = 2*15 - 3*4 + 9*4 = 30 - 12 + 36 = 54
F = (7 + 3)(18-5) - 7[3(8-6)] = 10*13 - 7(3*2) = 130 - 7(6) = 130 - 42 = 88
Explications étape par étape :
