Réponse :
Explications étape par étape
Bsr,
exercice 1
1= 9/3 = 3
2= -3/3 = -1
3= 6/21 = 2/7
4: 2/3*2=4/3
5: 2/3 * 0,5 = 1/3
6: 2/3+1 = 2/3 + 3/3 = 5/3
7: 2/3 + 2 = 2/3 + 6/3 =8/3
8: (2/3)/(3/2) = 2/3*2/3 = 4/6 = 2/3
Exercice 2
1)
3/8 de 48 -> (3*48)/8 = 18
2)
4/7 -> 28€
1/7 -> 28/4
7/7 -> (28*7)/4 => 49€
3)
5/9 de 3/4
(5*3)/(9*4) => 15/ 36 => 5/6
4)
2+3/4 = 1/2 + 4/3 = 3/6 +8/6 = 11/6