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Tiffanie24
@Tiffanie24
May 2019
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Bonjour ! Je suis en 3e et j'ai besoin d'aide pour cet exercice qui est à faire pour demain. ^^ Merci d'avance pour votre aide !
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Eliott78
Verified answer
Bonsoir,
1) 2×3 = 6
2) (n + 0,5)² = 6² + (2×6×0,5) + 0,5²
(n + 0,5)² = 36 + 6 + 0,25
(n + 0,5)² = 42,25
3) Calculer de tête (n + 0,5)² = 6,5² que l'on décompose comme suit :
6×6 + 6 + 0,5×0,5 = 36 + 6 + 0,25 = 42,25
4) 3,5² = 3×3 + 3 + 0,5×0,5 = 9 + 3 + 0,25 = 12,25
7,5² = 7×7 + 7 + 0,25 = 49 + 7 + 0,25 = 56,25
10,5² = 10×10 + 10 + 0,5×0,5 = 100 + 10 + 0,25 = 110,25
2 votes
Thanks 1
Tiffanie24
Merci beaucoup ! :)
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Lista de comentários
Verified answer
Bonsoir,1) 2×3 = 6
2) (n + 0,5)² = 6² + (2×6×0,5) + 0,5²
(n + 0,5)² = 36 + 6 + 0,25
(n + 0,5)² = 42,25
3) Calculer de tête (n + 0,5)² = 6,5² que l'on décompose comme suit :
6×6 + 6 + 0,5×0,5 = 36 + 6 + 0,25 = 42,25
4) 3,5² = 3×3 + 3 + 0,5×0,5 = 9 + 3 + 0,25 = 12,25
7,5² = 7×7 + 7 + 0,25 = 49 + 7 + 0,25 = 56,25
10,5² = 10×10 + 10 + 0,5×0,5 = 100 + 10 + 0,25 = 110,25