Réponses

2014-04-04T18:48:54+02:00
5/9 - 4/7 X 5/3
5/9 - (4x5)/(7x3)
5/9 - 20/21
(5x7)/(9x7) - (20x3)/21x3)
35/63 - 60-63
-25/63

(7/12 - 1/4) x 6/7
(7/12 - 3/12) x 6/7
4/12 x 6/7
24/84
6/21
2014-04-04T19:40:27+02:00
5/9 - 4/7 X 5/3
5/9 - (4x5)/(7x3)
5/9 - 20/21
(5x7)/(9x7) - (20x3)/21x3)
35/63 - 60-63
-25/63

(7/12 - 1/4) x 6/7
(7/12 - 3/12) x 6/7
4/12 x 6/7
24/84
6/21