bonjour
soit x le Cd
3 x + 25 = 5 x - 11
3 x - 5 x = - 11 - 25
- 2 x = - 36
x = 18
un CD vaut 18 €
3*18 + 25 = 79
5*18 - 11 = 79
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bonjour
soit x le Cd
3 x + 25 = 5 x - 11
3 x - 5 x = - 11 - 25
- 2 x = - 36
x = 18
un CD vaut 18 €
3*18 + 25 = 79
5*18 - 11 = 79