Réponse : Bonsoir, voici des réponses détaillées.
Exercice n°16 :
A = 31 - ( 4 + 5 ) x 2
A = 31 - 9 x 2
A= 31 - 18
A = 13
B = ( 14 + 7 ) : 3 + 4
B = 21 : 3 + 4
B = 7 + 4
B = 11
C = 42 x ( 13 - 11 ) 3
C = 42 x 2 x 3
C = 84 x 3
C = 252
D = 40 - ( 13 - 6 ) x ( 1 + 2 )
D = 40 - 7 x 3
D = 40 - 21
D = 19
E = [ 14 - ( 2 + 3 ) ] x 2
E = [ 14 - 5 ] x 2
E = 9 x 2
E = 18
F = 12 [ ( 4 + 2 ) x 2 ]
F = 12 x [ 6 x 2 ]
F = 12 x 12
F = 144
G = [ 56 - ( 7 - 2 ) x 4 ] : 3
G = [ 56 - 5 x 4 ] : 3
G = [ 56 - 20 ] : 3
G = 36 : 3
G = 12
H = 0,5 x [ 38 - ( 7 + 3 ) + 8 ]
H = 0,5 x [ 38 - 10 + 8 ]
H = 0,5 x [ 28 + 8 ]
H = 0,5 x 36
H = 18
Exercice n°17 :
1) 62 - 30 - 7 + 20
= 32 - 7 + 20
= 25 + 20
= 45
2) 62 - [ 30 - ( 7 + 20 ) ]
= 62 - [ 30 - 27 ]
= 62 - 3
= 59
3) 62 - [ ( 30 - 7 ) + 20 ]
= 62 - [ 23 + 20 ]
= 19
