Réponse :
1/3 + 1/4 = 4/12 + 3/12 = 7/12
2/5 - 4/3 = 6/15 - 20/15 = -14/15
2/10 + 2 = 2/10 + 20/10 = 22/10 = 11/5
3/4 - 1 = 3/4 - 4/4 = -1/4
1/4 + 2/5 - 4/10 = 5/20 + 8/20 - 8/20 = 1/4
3/2 - (4/10 + 2) = 3/2 - (4/10 + 20/10) = 3/2 - 24/10 = 15/10 - 24/10 = -9/10
Explications étape par étape :
