Réponses

2014-09-07T13:54:21+02:00
Bonjour
a = 1/2 et b = 2/5

1) la somme = 1/2 + 2/5 = 5/10 + 4/10 = 9/10
2) somme des inverses = 2 + 5/2 = 4/2 + 5/2 = 9/2
3) l'inverse de leur somme = 10/9
4) la somme de leur carré = (1/2)² + (2/5)² = 1/4 + 4 /25 = 25/100 + 16/100 = 41/100