Réponses

2014-05-29T11:53:21+02:00
Bonjour

- surface verte = (2/3 x 1/3) : 2 = 2/9 : 2 = 2/18 ou 1/9
- surface bleue = verte  = 1/9
- surface  jaune = (1/3 x 1/3) : 2 = 1/9 : 2 = 1/18
- surface rouge = jaune = 1/18

1/9 + 1/9 +1/18 +1/18 = 2/18 + 2/18 + 1/18 + 1/18 = 6/18 ou 1/3

surface blanche = 2/3