Réponses

2013-03-02T19:57:18+01:00

a = 5/3 et b = 10/21

 

a/

a+b = 5/3 + 10/21 = 35/21 + 10/21 = 15/7

 

b/

a-b = 5/3 - 10/21 = 35/21 - 10/21 = 25/21

 

c/

ab = 5/3 * 10/21 = 50/63

 

En espérant t'avoir aidé.