Bonsoir
Calculer et donner sous forme de fraction simplifiée :
8/15 + 13/15
= (8 + 13)/15
= 21/15
= (7 x 3)/(5 x 3)
= 7/5
11/12 + 7/12
= (11 + 7)/12
= 18/12
= (6 x 3)/(6 x 2)
= 3/2
12/21 + 12/21
= (12 + 12)/21
= 24/21
= (3 x 8)/(3 x 7)
= 8/7
10/7 + 11/7
= (10 + 11)/7
= 21/7
= (7 x 3)/7
= 3
