Ex1
5/8 = 20/32
21/56 = 3/8
3/7 = 9/21 = 15/35 = 27/63
Ex2
3/15 = 1/5
25/44 = 5/10 = 1/2
20/80 = 2/8 = 1/4
45/81 = 5/9
Ex3
6/22 > 4/22 donc 3/11 > 4/22
11/12 < 12/12 donc 11/12 < 1
15/21 = 15/21 donc 5/7 = 15/21
10/45 > 8/45 donc 2/9 > 8/45
Ex4
4/12 10/12 11/12 3/12 16/12
16/12 > 11/12 > 10/12 > 4/12 > 3/12
donc :
4/3 > 11/12 > 5/6 > 1/3 > 1/4
Ex5
7/6 + 1/6 = 8/6 = 4/3
2 + 1/7 = 14/7 + 1/7 = 15/7
En espérant t'avoir aidé.
