bonjour
4 x - 1 = 5 x + 3
4 x - 5 x = 3 + 1
- x = 4
x = - 4
donc - 2 n'est pas solution
x + 2 = 3 x + 7
x - 3 x = 7 - 2
- 2 x = 5
x = - 5/2
7 x + 9 = 4 - 4 x
7 x + 4 x = 4 - 9
11 x = - 5
x = - 5 /11
3 x / 4 + 1 /4 = - 2 x / 5 + 8 /5
15 x /20 + 5 /20 = - 8 x /20 + 32 /20
15 x + 8 x = 32 - 5
23 x = 27
x = 27/23
France = x
Allemagne = 2 x
Canada = 2 x
Norvège = 2 x + 9
pomme = x
poires = 3 x
x + 3 x + 1 = 29
4 x = 28
x = 7
7 pommes et 21 poires
P = 2 ( x + x + 3 ) = 2 x + 2 x + 6 = 4 x + 6
4 x + 6 = 27
4 x = 27 - 6
4 x = 21
x = 21/4 = 5.25
fais les 2 derniers
