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eaudile2310
@eaudile2310
January 2021
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Six nombres 1, 7, 11, 19, 30 et un nombre inconnu ont pour moyene le triple de ce nombre quel est ce nombre? Pouvez vous m'aider merci bcp
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maudmarine
Verified answer
Bonjour,
Soit x le nombre inconnu :
(1 + 7 + 11 + 19 + 30 + x) / 6 = 3x
(68 + x) / 6 = 3x
(68 + x) / 6 = 18x/6
68 + x = 18x
x - 18x = - 68
- 17x = - 67
x = 67/17
Ce nombre est 67/17
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eaudile2310
Merci beaucoup:)
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Bjr, je voudrais comprendre cet exercice.
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Verified answer
Bonjour,Soit x le nombre inconnu :
(1 + 7 + 11 + 19 + 30 + x) / 6 = 3x
(68 + x) / 6 = 3x
(68 + x) / 6 = 18x/6
68 + x = 18x
x - 18x = - 68
- 17x = - 67
x = 67/17
Ce nombre est 67/17