Réponse:
bonjour,
Exercice 1
A) 4/9 - 7/27 =
(3 × 4)/(3 × 9) - (1 × 7)/(1 × 27) =
12/27 - 7/27 =
(12 - 7)/27 =
5/27
B) 6/5 - 8/45 =
(6×9 )/ (5×9) - 8/45 =
54/45 -8/45 =
46/45
C) 6/5 - 7/30 =
(6×6)/(5×6) - 7/30 =
36/30 - 7/30 =
29/30
D) 8/7 - 4/35 =
(8×5)/(7×5) - 4/35 =
45/35 - 4/35 =
41/35
E) 10/9 - 5/72 =
(10×8)/(9×8) - 5/72 =
80/72 - 5/72 =
75/72
F) 9/14 + 3/2 =
9/14 + (3×7)/(7×2) =
9/14 + 21/14 =
30/14
G) 10/7 - 4/35 =
(10×5)/(7×5) - 4/35 =
50/35 - 4/35 =
46/35
H) 10/49 + 8/7 =
10/49 + (8×7)/(7×7) =
10/49 + 54/49 =
64/49
Tous les autre exercices sont les mêmes que le premier, tu as plus qu'à faire de même pour les autres
