bonjour,
soit x le tour de manège
5 x - 2 = 3 x + 7
5 x - 3 x = 7 + 2
2 x = 9
x = 9/2 = 4.5
un tour vaut 4.50 €
5 * 4.5 - 2 = 22.5 - 2 = 20.5
3* 4.5 + 7 = 13.5 + 7 = 20.5
il a 20.50 €
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bonjour,
soit x le tour de manège
5 x - 2 = 3 x + 7
5 x - 3 x = 7 + 2
2 x = 9
x = 9/2 = 4.5
un tour vaut 4.50 €
5 * 4.5 - 2 = 22.5 - 2 = 20.5
3* 4.5 + 7 = 13.5 + 7 = 20.5
il a 20.50 €