Répondre :
(-1/2 + 2/3) / (3/4 - 1/12 + 1/3)
= (-3/6 + 4/6) / (9/12 - 1/12 + 4/12)
= (1/6) / (12/12)
= (1/6) / 1
= 1/6
D = - 1 sur 2 + 2 sur 3
3 sur 4 - 1 sur 12 + 1 sur 3
(-1/2 + 2/3) / (3/4 - 1/12 + 1/3)
= (-3/6 + 4/6) / (9/12 - 1/12 + 4/12)
= (1/6) / (12/12)
= (1/6) / 1
= 1/6