Réponses

2014-09-04T16:04:40+02:00
__3/2 __ = _______3/2_________  =          3/2___ = 3/2 = 3/2 : - 4/21 = 3/2 x - 21/4 =
1/7 - 1/3      1 x 3 / 7 x 3 - 1 x 7 / 3 x 7        3/21 - 7/21  - 4/21
- 63/8