Qui peut m’aider pour mes calcul de l’exercice 6 svp Merci

Bonsoir,

Soient A = (12/5)-(3/5)*(7/9) et B = ((2/3)-3)/(1/9)

1. A = (12/5)-(3/5)*(7/9) = (12/5)*(9/9)-(3/5)*(7/9) = (12*9)/(5*9)-(3*7)/(5*9) = (108/45)-(21/45) = (108-21)/45 = 87/45 = (29*3)/(15*3) = 29/15

2. B = ((2/3)-3)/(1/9) = ((2/3)-(9/3))/(1/9) = ((2-9)/3)/(1/9) = (-7/3)/(1/9) = (-7/3)*9 = (-7*9)/3 = -63/3 = (-21*3)/3 = -21