Réponses

2014-10-27T19:43:41+01:00
A 20/21 -2/7
20/21 - 6/21
14/21

 B -7/10-17/15
-21/30 -34/30
- 55/30
- 11/6

C 14/25 X 65/49
14x65 / 25/49
7x2 x13x5  / 5x5 x7x7
2x13 / 5x7
26/35


D 72/77 divise 12/121
72/77 x 121/12
72x 121 / 77 x12
6x12 x121 / 77x12
6x121 /77
6x11x11  / 7x11
6x11 /7
77 /7
11