Réponse :
bonjour
2 x - 3 = 6
2 x = 6+3
2 x = 9
x = 9/2 = 4.5
9 x + 3 = 7 x - 5
9 x - 7 x = - 5 - 3
2 x = - 8
x = -8/2 = -4
vis = x
marteau = 10 x
3 x + 10 x + 49.9 = 82.4
13 x = 82.4 - 49.9
13 x = 32.5
x = 2.5
les vis valent 2.50€
DVD = x
jeux = 3 x
console = 6 x
3 * 3 x + 2 x + 6 x = 212.5
9 x + 8 x = 212.5
17 x = 212.5
x = 12.5
DVD = 12.50
Jeux = 37.5
console = 75
camille = x
mère = 3 x
3 x + 12 = 2 ( x + 12 )
3 x + 12 = 2 x + 24
3 x - 2 x = 24 - 12
x = 12
camille a 12 ans et sa mère 36
Explications étape par étape :
