Réponses

Meilleure réponse !
2012-11-11T17:34:54+01:00

a(45+18) = 45(a+16)

=> 45a+18a = 45a +720

=> 45a - 45a + 18a = 720

=> 18a = 720

=> a = 720/18

=> a = 40

2012-11-11T17:36:14+01:00