Réponses

2014-09-15T20:26:51+02:00
Calculer A :

A = 2/9 - 13/9 x 1/6
A = 2/9 - 13/54
A = 2 x 6 / 9 x 6 - 13/54
A = 12/54 - 13/54
A = - 1/54