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Lagirl1
@Lagirl1
April 2019
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SVP AIDEZ MOI JE NE COMPREND PAS MERCI BEAUCOUP DE VOTRE AIDE
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senmusa
X² - y² = (x + y)(x-y)
or x + y = 18
L'équation devient
18(x- y)=144 <==> x-y=8
on a donc le système
(1) x - y = 8
(2) x + y = 18
on isole x dans (1) ==> x = 8 +y
(2) devient:
8 + y + y = 18 <==> 2y =10 ==> y=5
on remplace dans (1)
x = 18 + y = 18 + 5 = 23
==> x = 23 et y = 5
0 votes
Thanks 1
lagirl1
merci beaucoup
senmusa
de rien beaucouuuup :D
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Lista de comentários
or x + y = 18
L'équation devient
18(x- y)=144 <==> x-y=8
on a donc le système
(1) x - y = 8
(2) x + y = 18
on isole x dans (1) ==> x = 8 +y
(2) devient:
8 + y + y = 18 <==> 2y =10 ==> y=5
on remplace dans (1)
x = 18 + y = 18 + 5 = 23
==> x = 23 et y = 5