Réponse:
exercice 1
opposé de (+2) = -2
opposé de (-10) = +10
opposé de (-3+4) = (+3-4)
opposé de (+9+7)=(-9-7)
opposé de (-1-8)=(+1+8)
exercice 2
opposé de (+5)=(-5)
opposé de (+5)=(-5)
opposé de (-9)=(+9)
opposé de (+1)=(-1)
opposé de (-11)=(+11)
exercice 3
-5 +5 +5 -5 -3
+3 +9 +10 -1 +6
+11 -12 +13 -13 -4
exercice 4
+4+3=7
-5-3= -8
-10-5= -15
-4-2= -6
+4+3=7
+4-3=1
-5+3= -2
-10+5= -5
-4+2= -2
exercice 5
+5+3+3-5 -2+5-5-2+5
= +6 = 1
-2+3+6-5-6 -11+6-2+2+11
= -4 = 6
+2+3-6+5-6 -5-6+10-2+3+10
= -2 = 10
