Répondre :
bonsoir
1/3 + 1/4 + 5/12
= 4/12 + 3/12 + 5/12
= 12/12
= 1
donc la carafe sera remplie à ras bord
Exercice 43:
A= 5/7 - (3/2 - 5/4) = 5/7 - (6/4 - 5/4) = 5/7 - 1/4 = 20/28 - 7/28 = 13/28
B= (5/8 + (-7)/4) - ( (-1)/3 - 4/3) = (5/8 - (-14)/8) - (-5/3) = (-9/8) - ( -5/3) = -9/8 + 5/3 = -27/24 + 40/24 = 13/24
Exercice 44:
1/3 + 1/4 + 5/12 = 4/12 + 3/12 + 5/12 = 12/12 = 1 L
Achille a donc raison.