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EBas
@EBas
June 2021
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Math: ex:
Si on retranche un même nombre au numérateur et au dénominateur de la fraction 4/5, on obtient la fraction 5/4. Quel est ce nombre ?
Merci d'avance
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nonotata
Soit x le nombre
4/5 - x/x = 5/4
4*x / 5/x = 5/4
4(4-x) = 5 (5-x)
16-4x = 25 -5x
-4x+5x = 25-16
x = 9
le nombre recherche est 9
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EBas
ah merci beaucoup
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4/5 - x/x = 5/4
4*x / 5/x = 5/4
4(4-x) = 5 (5-x)
16-4x = 25 -5x
-4x+5x = 25-16
x = 9
le nombre recherche est 9