Réponses

2014-05-29T19:28:59+02:00
Soit X ce nombre

X - X/4 = 2/5
X(1-1/4) = 2/5
X(4/4 - 1/4) = 2/5
X(3/4) = 2/5
X = (2*4) / (5*3)
X = 8 / 15