Réponses

2014-02-11T15:01:49+01:00
A) -8:5 + 7:5 =( -8+7) :5 =-1:5
b) 4:5 -1:5 = 3:5
c  5/6 +7/6 = 12/6=2
d  -9/17-1/17 = -10/17