Réponses

2013-09-18T18:47:07+02:00
Bonsoir
A = 10/12+9/12 = 19/12
B = -3/7 x 4/-5 = -12/-35
C = 20/35 +21/35 = 41/35
D = 13/3 -4/3 x 2 = 13/3 -8/3 = 5/3