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babane48
@babane48
January 2021
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C'est le 91 svp j'ai pas compris
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loulakar
Verified answer
Bonjour,
a) développer :
A = (x + 1)(x - 1)
A = (a + b)(a - b) identité remarquable
A = x² - 1
b) en déduire :
101 x 99 = (100 + 1)(100 - 1) = 100² - 1 = 9999
1001 x 999 = (1000 + 1)(1000 - 1) = 1000² - 1 = 99999
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Lista de comentários
Verified answer
Bonjour,a) développer :
A = (x + 1)(x - 1)
A = (a + b)(a - b) identité remarquable
A = x² - 1
b) en déduire :
101 x 99 = (100 + 1)(100 - 1) = 100² - 1 = 9999
1001 x 999 = (1000 + 1)(1000 - 1) = 1000² - 1 = 99999