Réponse :
Explications étape par étape
Bonsoir
Merci de changer ton profil, niveau lycée pour ce genre d’exercice ?
17/12 + 3/4 + 9/2
= 17/12 + (3 x 3)/(4 x 3) + (9 x 6)/(2 x 6)
= 17/12 + 9/12 + 54/12
= (17 + 9 + 54)/12
= 80/12
= (4 x 20)/(4 x 3)
= 20/3
4/5 - 2/15 + 1/3
= (4 x 3)/(5 x 3) - 2/15 + (1 x 5)/(3 x 5)
= 12/15 - 2/15 + 5/15
= (12 + 5 - 2)/15
= 15/15
= 1
5/8 + (19/24 - 1/3)
= (5 x 3)/(8 x 3) + 19/24 - (1 x 8)/(3 x 8)
= 15/24 + 19/24 - 8/24
= (15 + 19 - 8)/24
= 26/24
= (2 x 13)/(2 x 12)
= 13/12
