Réponse :
11) A = 4/7 : 7/4 = 16/49
B = 4/7 : 4/7 = 1
C = - 3/7 : 2 = - 3/14
D = - 8/5 : 8 = - 1/5
E = - 4/15 : - 1/- 3 = - 12/15 = - 4/5
F = 1 : - 4/17 = - 17/4
12) A = 4 : - 2/9 = - 18
B = 15/- 7 : - 25/2 = 6/35
C = - 21 : - 7/9 = 27
Explications étape par étape :
