Bonjour
Calculer et donner le résultat sous la forme d'une fraction simplifiée
1) -4/5+5/9= (- 4 x 9) / (5 x 9) + (5 x 5) / (9 x 5) = - 36/45 + 25/45 = - 11/45
2) -1/9+4/6= (-1 x 2) / (9 x 2) + (4 x 3) / (6 x 3) = - 2/18 + 12/18 = 10/18 = (2 x 5) / (2 x 9) = 5/9
3) -2/4-9/2= (- 2 x 1) / (2 x 2) - 9/2 = - 1/2 - 9/2 = - 10/2 = (2 x - 5) / (2 x 1) = - 5
4) 9--3/4= (9 x 4) / (1 x 4) + 3/4 = 36/4 + 3/4 = 39/4.
5) 3/4-5/6= (3 x 3) / (4 x 3) - (5 x 2) / (6 x 2) = 9/12 - 10/12 = - 1/12.
