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Gang193
@Gang193
April 2019
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MATHEMATIQUES :
K = (a +1)²- (a-1)²
1) développer , puis réduire l'expression K
2) En déduire le calcul de 100 001² - 99 999²
J’espère que vous aller m'aidez c'est mon premier devoir posté ;)
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Piff
K = (a+1+a-1)(a+1-a+1) = (2a)(2) = 4a
100 001² - 99 999² = K avec a = 100 000
soit 100 001² - 99 999² = 400 000
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100 001² - 99 999² = K avec a = 100 000
soit 100 001² - 99 999² = 400 000