aider moi svp ㅠㅠ :))

Réponse :Bonsoir,
a) -2/9 × -4/3 = 8/27
b) -2,5/7 × 4/11 = -10/77
c) 17/19 × 19/17 = 1
d) 3/5 × 7/6 = 7/10
Bonne continuation !!