Exercice 2 : (Surprenant) (3 points ) 1) Calcule en détaillant les étapes. A = 1-2-3-4 B = 1 - 2 - 3 - 4 - 5 - 6 C = 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 D = 1 - 2 - 3

A = 1-2-3-4

=-1-3-4

=-4-4

=-8

B = 1 - 2 - 3 - 4 - 5 -6

=-1-3-4-5-6

=-4-4-5-6

=-8-5-6

=-13-6

=-19

C = 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8

=-1-3-4-5-6-7-8

=-4-4-5-6-7-8

=-8-5-6-7-8

=-13-6-7-8

=-19-7-8

=-26-8

=-34

D = 1 - 2 - 3 - 4 + 5 - 6 + 7 - 8 + 9 - 10

=-1-3-4+5-6+7-8+9-10

=-4-4+5-6+7-8+9-10

=-8+5-6+7-8+9-10

=-3-6+7-8+9-10

=-9+7-8+9-10

=-2-8+9-10

=-10+9-10

=-1-10

=-11