Bonjour
a = - 3/4 et b = 5/11
1) Inverse de a = - 4/3
Inverse de b = 11/5
2) - 4/3 x 11/5 = - 44/15
3) - 3/4 x 5/11 = - 15/44
L'inverse est : - 44/15
4) - 4/3 + 11/5 = (- 4 x 5) / (3 x 5) + (11 x 3) / (5 x 3) = - 20/15 + 33/15 = 13/15
5) - 3/4 + 5/11 = (- 3 x 11) / (4 x 11) + (5 x 4) / (11 x 4) = - 33/44 + 20/44 = - 13/44
L'inverse est : - 44/13.
