Réponses

2014-10-07T21:14:52+02:00

Salut,

voici tes deux exercices corrigés.

Exercice 1:

A = 5 - (-6 + a)

A = 5 + 6 - a

A = 11 - a

B = a - b + (3b - 8) - (a + b) - (5 - b)

B = a - b + 3b - 8 - a - b - 5 + b

B = 2b - 13

C = 18 - (a + b - 3) - (a - b) + 3a - 2b

C = 18 - a - b + 3 - a + b + 3a - 2b

C = a - 2b + 21

D = 3x - (2x + 1) + (5x + 6) - (-2x + 3)

D = 3x - 2x - 1 + 5x + 6 + 2x - 3

D = 8x + 2

Exercice 2 :

A = -2 x (-3) x 10

A = 60

B = -21/7

B = -3

C = -81/9

C = -9

D = -5 x 2 x (-7) x 4

D = 280

(Tu peux calculer tout de tête.)

A+