Réponses

2012-06-03T14:10:42+02:00

1/2n = 3/6n

1/3n = 2/6n

Donc :

1/2n + 1/3n + 1/6n = 3/6n + 2/6n + 1/6n = 6/6n = 1/n

D'où :

1/n+1/2n+1/3n+1/6n = 1/n + 1/n = 2/n

 

FIN