Bonjour
Calculer et donner le résultat sous la forme d'une fraction irréductible.
A=7/9+1/9 foix 1/2.
A = 7/9 + 1/18
A = (7 x 2) / (9 x 2) + 1/18
A = 14/18 + 1/18
A = 15/18
A = (3 x 5) / (3 x 6)
A = 5/6
B=6/5foix(7/3-1/4)
B = 6/5 x [(7 x 4) / (3 x 4) - (1 x 3) / (4 x 3)]
B = 6/5 x (28/12 - 3/12)
B = 6/5 x 25/12
B = 150/60
B = (30 x 5) (30 x 2)
B = 5/2.
