Réponse :
A = (3/2 - 1/3)/(3/4 + 2/3)
= (9/6 - 2/6)/(9/12 + 8/12)
= 7/6/17/12
= 7 x 12/6 x 17
= 14/17
B = 7/5 + 8/15/2/3 - 19/2
= 7/5 + (8 x 3/15 x 2) - 19/2
= 7/5 + 4/5 - 19/2
= 14/10 + 8/10 - 95/10
= 22/10 - 95/10
= - 73/10
Explications étape par étape :