Réponses

2012-09-19T14:16:17+02:00

7/5-3/5x4/21

=7/5-3/5x4/7

=7/5-12/35

=49/35-12/35

=37/35

 

Voila bonne journée

By Vetteliste

2012-09-19T14:22:21+02:00

7/5- 12/105 = 7/5- (12/3)/(105/3) = 7/5-4/35 = (7x7)/(5x7) - 4/35 = 49/35 - 4/35 = 45/35 = (45/5)/(35/5) = 9/7