besoin d'aide merci . Compléter. a)... +(+11)=(-6) b) (-4)+...=(+15) c) (-4) +...=(-9) d)...+(+30)=(+18) Calculer. A=(-9)-(-4) B =(-8)-(+3) C=(+7)-(+2) D

a) - 17 +(11)=(-6)

b) (-4)+19=(+15)

c) (-4) + (-5)=(-9)

d)(-12) +(+30)=(+18)


Calculer.
A =(-9)-(-4)
A =  -5

B =(-8)-(+3)
B = -11


C =(+7)-(+2)
C = 5

D=(+16)-(-3)
D = 19

E=(-5)-(-9)
E = +4

F=(+8)-(+15)
F = -7

a) -17+11 = -6

b) -4-11 = -15

c) -4-5 = -9

d) -12+30 = 18

calculer :

A  = -9+4 = -5
B = -8-3 = -11
C = 7-2 =5
D = 16=3 = 19
E = -5+9 =4
F = 8-15 = -7

regarde ici c'est bien expliqué http://fitoussi.serge.free.fr/Quatrieme/relatifs.htm