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Kalsyy
@Kalsyy
April 2019
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Coucou tout le monde, j'ai besoin d'aide svp.
Maths- 2nde
La moyenne de trois nombres a,b et c est 29; celle des nombres a et b est 22 et celle de b et c est 39,5. Quels sont ces trois nombres ?
Réponses avec calculs et justifications svp
Mercii
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isapaul
Verified answer
Bonsoir
on connait
(a+b+c) / 3 = 29 ; (a+b)/2 = 22 et (b+c)/2 = 39.5 soit
(a+b+c) = 87 ; a+b = 44 ; b+c = 79
44 + c = 87 ; a+b = 44 ; b+c = 79
c = 43 ; a+b = 44 ; b = 79 - 43
c = 43 ; a+b = 44 ; b = 36
c = 43 ; a = 8 ; b = 36
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Verified answer
Bonsoiron connait
(a+b+c) / 3 = 29 ; (a+b)/2 = 22 et (b+c)/2 = 39.5 soit
(a+b+c) = 87 ; a+b = 44 ; b+c = 79
44 + c = 87 ; a+b = 44 ; b+c = 79
c = 43 ; a+b = 44 ; b = 79 - 43
c = 43 ; a+b = 44 ; b = 36
c = 43 ; a = 8 ; b = 36