Bonjour à tous besoin d'aide pour les deux exercices merci

Hello !

Exercice 2 :

A = (-42) + (+28) + (-23) + (+8) + (+23)

A = -65 + 59

A = -6

B = (-83) + (+28) + (+83) + (-44) + (+12)

B = -127 + 123

B = -4

C = (+73) + (+85) + (-10) + (-85) + (-65)

C = 158 + (-160)

C = -2

D = (-38) + (+50) + (-4) + (+42) + (-50)

D = -92 + 92

D = 0

E = (+2) + (+91) + (+34) + (-91) + (-34)

E = 127 + (-125)

E = +2

Exercice 3 :

A = -9 - (-3)

A = -9 + (+3)

A = -6

B = (+8) - (-13)

B = +8 + (+13)

B = +21

C = -8 - (+15)

C = -8 + (-15)

C = -23

D = (+16) - (-5)

D = (+16) + (+5)

D = +21

E = (+25) - (+15)

E = (+25) + (-15)

E = +10

F = -27 - (-17)

F = -27 + (+17)

F = -10

C'est -12 qui n'est pas un résultat des calculs précédents.

Bonne journée !

Hello !

Exercice n°2 :

A= -42+28-23+8+23 = -42+36 = -6

B= -83+28+83-44+12 = 40-44 = -4

C= 73+85-10-85-65 = 73-75 = -2

D= -38+50-4+42-50 = -42+42 = 0

E= 2+91+34-91-34 = 2

Exercice n°3 :

a)

A = -9+3 = -6

B = 8+13 = 21

C = -8-15 = -23

D = 16+5 = 21

E = 25-15 = 10

F = -27+17 = -10

b) -12