Réponses

2012-11-02T17:12:31+01:00

A=7/9-4/9*3/8 = 7/9 - 12/72 = 56/72 - 12/72 = 44/72 = 11/18 en divisant par 4

voili voilou

2012-11-02T19:15:43+01:00

Salut

A = 7/9-4/9x3/8

A = 7/9 - 12/72

A = 56/72 - 12/72

A = 44/72

PGCD(44;72) = 4

 

44/4 = 11

72/4 = 18

donc A= 11/18