Sans calculatrice et sans poser d'opérations, calcule de 2 façons différentes : 201² - 199².... Pergunta de ideia deJul59

April 2019 1 73 Report

Sans calculatrice et sans poser d'opérations, calcule de 2 façons différentes :

201² - 199²

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xxx102

Verified answer

Bonjour,

Factorise :

$(201-199)(201+199) = 2 \times 400 = 800$

Ou sinon :

$(200+1)^2-(200-1)^2 = (40000+400+4)-(40000-400+4\\= 800$

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