Bonjour,
a) Calculer en détaillant :
A= 7/9 x 3/4
A = 21/36
A = 3 x 7 / 3 x 12
A = 7/12
B= -5/3 x 2/-7
B = 10/21
C= -8 x 7/6
C = - 56/6
C = 2 x (- 28) / 2 x 3
C = - 28/3
D= 11/2 : 3/4
D = 11/2 x 4/3
D = 44/6
D = 2 x 22 / 2 x 3
D = 22/3
E= -1/3 : 5/-6
E = - 1/3 x - 6/5
E = 6/15
E = 3 x 2 / 3 x 5
E = 2/5
F= 5/-4 : -2/-7
F = - 5/4 x 7/5
F = - 35/20
F = 5 x (- 7) / 5 x 4
F = - 7/4
G= 5/9 : 15
G = 5/9 x 1/15
G = 5/135
G = 5 x 1 / 5 x 27
G = 1/27
b) Décomposer en produit de facteurs premiers
136 = 2 x 2 x 2 x 17
192 = 2 x 2 x 2 x 2 x 2 x 2 x 3
360 = 2 x 2 x 2 x 3 x 3 x 5