Réponse : exo 3

a) 15 - ( 7-4) =12

b) 56 - (14 + 31) = 11

c) 3 +2 - ( 1 + 4) = 0

d) 7 x (7-7) + 7 = 7

e) 8 + 5 - (4 x 3 ) = 1

f) 8 + (5 -4) x 3= 11

g) (11 -2) x (3 + 5) = 72

h) 11 -(2 x 3+5)= 0

exo 4

Q = 6 x 5 - ( 4 -3) = 30 - ( 1) = 30 - 1 = 29

R = 4 x (2 + 3 x 6) x 5= 20 x (20)= 400

S = 5 x [(3 + 4) - (8 -6)] = 5 x (7 -2) = 5 x 5=25

T = [4 x (2 + 3 x 6 ) ] x 5 = 4 x ( 20) x 5 = 20 x 20= 400

Explications étape par étape :