exercice 92 aider moi .. svp les calculs en detail

a = -3 x 5/6 = -15/6 = -3/2

b = -3/6 x 1/5 = -3/30 = -1/10

c = -7/5 : 30/5+1/5 = -7/5 : 31/5 = -7/5 x 5/31 = -7/31