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emmagly7
@emmagly7
January 2021
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je tape sur ma calculatrice la séquence suivante: 6 * ? - 3 -2 * ? + 7. 1) sachant que les "?'' cachent le même nombre ( entier décimale fraction...) peut tu trouver ce nombre pour avoir 24
2) Même chose si la calculatrice donne 592?
3)Même chose si la calculatrice donne -163,6?
merci
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Azh2001
Bonjour,
soit x le nombre cherché
1) 6*x -3 - 2*x +7 = 24
6x-3-2x+7 = 24
4x+4 = 24
4x =24-4
x = 5
6*5 -3 - 2*5 +7 =
30-3-10+7 = 37-13 = 24
2) 6x-3-2x+7 = 592
4x+7 = 592
4x =592-7
x =585/4
3) 6x-3-2x+7 =-163,6
4x+4 = -163,6
4x = -163,6-4
x = -41,9
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Lista de comentários
soit x le nombre cherché
1) 6*x -3 - 2*x +7 = 24
6x-3-2x+7 = 24
4x+4 = 24
4x =24-4
x = 5
6*5 -3 - 2*5 +7 =
30-3-10+7 = 37-13 = 24
2) 6x-3-2x+7 = 592
4x+7 = 592
4x =592-7
x =585/4
3) 6x-3-2x+7 =-163,6
4x+4 = -163,6
4x = -163,6-4
x = -41,9