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eleandres
@eleandres
June 2021
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Dans un zoo, il y a des cacatoès et des koalas. On peut y dénombrer 50 têtes et 146 pattes. Quel est le nombre de cactoès? de koalas ?
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winner123
Verified answer
Bonjour
tu notes x les cacaotes et y les loalas
x + y = 50
2 x + 4 y = 146
- 2 x - 2 y = - 100
2 x + 4 y = 146
2 y = 46
y = 23
tu as 23 koalas et 50 -23 = 27 oiseaux
27 x 2 = 54 pattes
23 x 4 = 92
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Thanks 2
eleandres
merci beaucoup
nathalienouts
Soit x le nombre cacatoès
on a 50-x le nombre de koalas
2x+4(50-x) = 146
2x+200-4x = 146
-2x = 146-200
-2x = -54
x = -54/-2
x = 27 cacatoès et 50-27 = 23 koalas
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Thanks 1
eleandres
j'ai une petite question d'ou vient le 200 ?
winner123
c'est 4 x 50
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Bonjourtu notes x les cacaotes et y les loalas
x + y = 50
2 x + 4 y = 146
- 2 x - 2 y = - 100
2 x + 4 y = 146
2 y = 46
y = 23
tu as 23 koalas et 50 -23 = 27 oiseaux
27 x 2 = 54 pattes
23 x 4 = 92
on a 50-x le nombre de koalas
2x+4(50-x) = 146
2x+200-4x = 146
-2x = 146-200
-2x = -54
x = -54/-2
x = 27 cacatoès et 50-27 = 23 koalas