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Sarah227
@Sarah227
May 2019
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( calcule littéral) bonjour je ne comprends pas l'exercice 17 pourriez-vous m'aider svp voici l'énoncé :
1. calculer 39² en développant (40-1)²
2. calculer de la même façon :
a. 99²
b. 29²
c. 195²
merci d'avance
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mehdi0609
2+2=4
voila la réponse à ta queston
5x5=25
0 votes
Thanks 0
Commentaires (9)
Bonjour
1. calculer 39² en développant (40-1)²
(a-b)² = a² - 2ab +b²
(40-1)² = 40² - 2x40x1 + 1² = 1600 - 80 +1 = 1520 +1 = 1521
2.
a. 99² = (100 - 1)² =...
b. 29² = (30 - 1)² =...
c. 195² = (200 - 5)² = ...
1 votes
Thanks 1
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Lista de comentários
voila la réponse à ta queston
5x5=25
1. calculer 39² en développant (40-1)²
(a-b)² = a² - 2ab +b²
(40-1)² = 40² - 2x40x1 + 1² = 1600 - 80 +1 = 1520 +1 = 1521
2. a. 99² = (100 - 1)² =...
b. 29² = (30 - 1)² =...
c. 195² = (200 - 5)² = ...