Réponses

2013-12-09T18:11:22+01:00
A=1-5/9
A=9/9-5/9=4/9

B=-4+7/3
B=-12/3+7/3=-5/3

C=5/4-7
C=5/4-28/4=-23/4

D=-7-4/3
D=-21/3-4/3=-25/3