bonjour
P 1
n
3 n
3 n + 25
2 ( 3 n + 25)
= 6 n + 50
pour obtenir 80
6 n + 50 = 80
6 n = 80 - 50
6 n = 30
n = 5
P 2
n
n + 10
11 ( n + 10) = 11 n + 110
11 n + 110 + 3
= 11 n + 113
obtenir 80
11 n + 113 = 80
11 n = 80 - 113
11 n = - 33
n = - 3
6 n + 50 = 11 n + 113
6 n - 11 n = 113 - 50
- 5 n = 63
n = - 63/5