Répondre :
Ex 57: (je réécris pas le calcul de départ)
I= 9+14-6-4 = 13
J= -26+12-7+15+8 = 2
K= -5+32+21-17 = 31
Ex 58:
A= 4-3+2-1 = 2
B= -2+7-6-4 = -5
C= -25-8+25-8-50 = -66
Ex 59:
A= 5+7+2-9 = 23
B= -15+8+6-4+6 = 1
C=-6+4+3-6 = 7
I= 9+14-6-4 = 13
J= -26+12-7+15+8 = 2
K= -5+32+21-17 = 31
Ex 58:
A= 4-3+2-1 = 2
B= -2+7-6-4 = -5
C= -25-8+25-8-50 = -66
Ex 59:
A= 5+7+2-9 = 23
B= -15+8+6-4+6 = 1
C=-6+4+3-6 = 7