Réponse:
Exercice 9 :
A=3-(-4+5)+(6-9)
=3-1+(-3)
=2-3
-1
B=1-(2-3)-(4-5)
=1-(-1)-(-1)
=1+1+1
=3
C=2-[1-(2+4)]
=2-(1-6)
=2-(-5)
=2+5
=7
D=[2-(-2)]-[2-(-4)]
=(2+2)-(2+4)
=4-6
=-2
E=-5-10-[-8-(4-3)]
=-5-10-(1-8)
=-5-10-7
=-15-7
=-22
F=-(-8+4)-[-13-(5-11)]
=-(-4)-(-13-6)
=4-(-19)
=4+19
=23
G=2-(-3-2)+(4-7)-[4-(-3)]
=2+5-3-7
=-3
Exercice 12 :
A=a-(b-c)+d
=-2-(3-(-1))-3
=2-4-3
=-5
B=-a-b-(c-d)
=-(-2)-3-(-1-(-3))
=2-3-(+2)
=2-3-2
=-3
Exercice 10 :
1°) 7-(8+2)=-3
7-10=-3
-3=-3
2°) -11+5-(2+4)=-12
-11+5-6=-12
=-11-1=-12
-12=-12
3°) -(100-100)-(1000-1000)=0
-0-0=0
0=0
