Verified answer

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

a) 21/15=7/5

b)11/12+7/12=18/12=3/2

c)12/21+12/21=24/21=8/7

d)10/7+11/7=21/7=3/1

j'espère t'avoir aidé ;D.