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Sagot :

bonjour

x=poules

y=lapins

2x+4y=60

x+y=19

x=19-y

2(19-y)+4y=60

38-2y+4y=60

-2y+4y=60-38

2y=22

y=22/2

y=11

il y a 11 lapins

19-11=8 poules

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