Réponses

2014-09-04T19:07:52+02:00
Meilleure réponse !
2014-09-04T19:09:35+02:00
1) 9/8 ÷ 6 = 9/8 x 1/6 = 9/48 = 3 x 3 / 3 x 16 = 3/16

2) 1/2 + 7/5 × 2/3 = 1/12 + 14/15 = 1 x 5 / 12 x 5 + 14 x 4 / 15 x 4 = 5/60 + 56/60 = 61/60

3) (1/2 + 7/5) × 2/3 = (1 x 5 / 2 x 5 + 7 x 2 / 5 x 2) x 2/3 = (5/10 + 14/10) x 2/3 = 19/10 x 2/3 = 38/30 = 2 x 19 / 2 x 15 = 19/15