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XavIEr47
@XavIEr47
April 2019
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Je ne comprends pas.
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nonotata
Soit x le nombre de filles et y le nombre de garcons donc
x+y = 1500
on sait également que
0.28x+0.32y = 455
il faut donc resoudre le système suivant
x+y =1500
0.28x +0.32y = 455
x+y = 1500
x = 1500 -y
0.28x+0.32y = 455
0.28(1500-y) +0.32y = 455
420 -0.28y +0.32y = 455
0.04y = 455-420
0.04y = 35
y = 35/0.04
y = 875
x = 1500-875
x = 625
il y a donc 625 filles et 875 garcons dans ce college
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XavIEr47
Merci
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Lista de comentários
x+y = 1500
on sait également que
0.28x+0.32y = 455
il faut donc resoudre le système suivant
x+y =1500
0.28x +0.32y = 455
x+y = 1500
x = 1500 -y
0.28x+0.32y = 455
0.28(1500-y) +0.32y = 455
420 -0.28y +0.32y = 455
0.04y = 455-420
0.04y = 35
y = 35/0.04
y = 875
x = 1500-875
x = 625
il y a donc 625 filles et 875 garcons dans ce college