Bonjour,
1/8 + n = 3/4
n = 3/4 - 1/8
n = 6/8 - 1/8
n = 5/8
3/4 + 3/4 = n + 1
6/4 = n + 1
3/2 - 1 = n
n = 3/2 - 2/2
n = 1/2
b) 1/6 + n = 1/3
n = 1/3 - 1/6
n = 2/6 - 1/6
n = 1/6
n = 1/3 + 1/3
n = 2/3
2/3 + 2/3 = 1/2 + n
4/3 - 1/2 = n
8/6 - 3/6 = n
n = 5/6
1/2 = n + 1/12
n = 1/2 - 1/12
n = 6/12 - 1/12
n = 5/12
Bonne journée