Réponse :
1e ligne :
2/3 - 1/3 = 1/3
2/3 - 1/4 = 5/12
2/3 - 3/2 = -5/6
2/3 - 2/5 = 4/15
2/3 - 2/3 = 0
2e ligne :
1/4 - 1/3 = -1/12
1/4 - 3/4 = -1/2
1/4 - 3/2 = -5/4
1/4 - 2/5 = -3/20
1/4 - 2/3 = -5/12
3e ligne :
4/5 - 1/3 = 7/15
4/5 - 3/4 = 1/20
4/5 - 3/2 = -7/10
4/5 - 2/5 = 2/5
4/5 - 2/3 = 2/15
4e ligne :
1/6 - 1/3 = -1/6
1/6 - 3/4 = -7/12
1/6 - 3/2 = -4/3
1/6 - 2/5 = -7/30
1/6 - 2/3 = -1/2