Réponses

2014-04-12T22:18:55+02:00
Salut :)

2/5x - 1/5 = 3/4
8/20x - 4/20 = 15/20
8/20x = 15/20 + 4/20
8/20x = 19/20
x = 19/20 / 8/20
x = 19/20 x 20/8
x = 19/8
x = 2

J'espère t'avoir aidé(e) ! :)


2014-04-12T22:45:12+02:00
Résoudre cette équation :

2/5x - 1/5 = 3/4
(2 x 4 / 5 x 4)x - (1 x 4 / 5 x 4) = 3 x 5 / 4 x 5
8/20x - 4/20 = 15/20
8/20x =  4/20 + 15/20
8/20x = 19/20
x = 19/20
       8/20
x = 19/20 x 20/8
x = 19/8
x = 2