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NozTv
@NozTv
May 2019
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Bonsoir, pouvez vous m'aider sur cette équation ?
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swnn
Soit x nombre de billets de 5€
y nombre de billets de 10€
x+y=21
5x+10y=125
x=21-y
5*(21-y)+10y=125
105-5y+10y=125
105+5y=125
5y=20
y=4 il y'a donc 4 billets de 10
x=21-4=17 billets de 5
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y nombre de billets de 10€
x+y=21
5x+10y=125
x=21-y
5*(21-y)+10y=125
105-5y+10y=125
105+5y=125
5y=20
y=4 il y'a donc 4 billets de 10
x=21-4=17 billets de 5