Bonjour,
1/2 -2/3 +3/4 -4/5 +5/6
1/2 -2/3 +5/6 = 3/6 -4/6 +5/6 = 4/6 = 2/3
3/4 -4/5 = 15/20 - 16/20 = -1/20
2/3 -1/20 = 40/60 - 3/60 = 37/60
ou
30/60 - 40/60 + 45/60 - 48/60 +50/60
= 37/60
