Sagot :
Exercice 25 :
A = 4 + 9 = 13
B = 6 + 3 = 9
C = - 6 - 8 = - 14
D = - 9 + 4 = - 5
E = 7 - 3 = 4
F = 5 - 9 = - 4
Exercie 27 :
L = - 17 + 13 = - 4
M = 18 + 27 = 45
R = 14 - 13 = 1
A = - 19 - 24 = - 43
E = 28 + 12 = 40
C = 32 - 40 = - 8
b ) MER
c ) LAC