Réponses

2014-01-22T20:27:21+01:00
A.fraction 7sur3 
b.2sur3
faire a+b ,a-b,axb................................8sur3 et 5sur12..............................2 et 3sur 4 faire la meme chose pour les 3 merci

7/3 et 2/3
7/3 + 2/3 = 9/3
7/3 - 2/3 = 5/3
7/3  2/3 = 14/9

8/3 et 5/12
8/3 + 5/12 = 8 x 4 / 3 x 4 + 5/12 = 32/12 + 5/12 = 37/12
8/3 - 5/12 = 32/12 - 5/12 = 7/12
8/3 x 5/12 = 40/ 36

2 et 3/4
2 + 3/4 = 2 x 4 / 1 x 4 + 3/4 = 8/4 + 3/4 = 11/4
2 - 3/4 = 8/4 - 3/4 = 5/4
2 x 3/4 = 6/4