Réponses

2014-03-23T10:08:28+01:00
B= (-8) + (+1)
B= -8 + 1
B= -7

C= (+9) + (-12)
C= 9 - 12
C= -3

D= (-12) + (+13)
D= -12 + 13
D= 1

E= (+14) + (-9)
E= 14 - 9
E= 5

F= (+3) + (+6)
F= 3 + 6
F= 9
2014-03-23T10:09:13+01:00
B=-8+1
B=-7

C=+9-12
C=-3

D=-12+13
D=1

E=+14-9
= 5

F=+3+6
=+9