Bonjour
Calculer et donner le résultat sous la forme d'une fraction simplifiée.
a. 7/18 + 1/6
= 7/18 + (1 x 3) / (6 x 3)
= 7/18 + 3/18
= 10/18
= (2 x 5) / (2 x 9)
= 5/9
b. 21/10 - 9/40
= (21 x 4) / (10 x 4) - 9/40
= 84/40 - 9/40
= 75/40
= (5 x 15) / (5 x 8)
= 15/8
c. 14/60 + 9/15
= 14/60 + (9 x 4) / (15 x 4)
= 14/60 + 36/60
= 50/60
= (10 x 5) / (10 x 6)
= 5/6
d. 7/8 + 35/48
= (7 x 6) / (8 x 6) + 35/48
= 42/38 + 35/48
= 77/48
