Réponse :
*5/2 + 7/3 = (5*3)/(2*3) + (7*2)/(3*2) = 15/6 + 14/6 = 29/6
*1 + 3/7 = (1*7)/(1*7) + 3/7 = 7/7 + 3/7 = 10/7
*5/12 + 5/9 = (5*9)/(12*9) + (5*12)/(9*12) = 45/108 + 60/108 = 105/108 = (3*35)/(3*36) = 35/36
*4 - 2/3 = (4*3)/(1*3) - 2/3 = 12/3 - 2/3 = 10/3
Explications étape par étape