Réponses

2014-09-10T16:54:18+02:00
A. -5 + (-3)
-5-3
-8

b. 2-(-1)+1
2+1+1
4

c. 2-9+7
-7+7
0

d.-5 - (-7+8)
-5 - 1
-6
Meilleure réponse !
2014-09-10T16:55:48+02:00
Exercice - 1 175 :

a = -2 - 3 + ( -5 + 2 )
= -5 - 3
= -8

b = 2 - ( 5 - 2 - 4 ) + 1
= 2 - ( 3 - 4 ) + 1
= 2 + 1 + 1
= 3 + 1
= 4

c = 2 - 4 - 9 + 4 + 7
= -2 - 5 + 7
= -7 + 7
= 0

d = ( 7 - 12 ) - ( 5 - 12 + 8 )
= -5 - ( -7 + 8 )
= -5 - 1
= -6