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RAhamin
@RAhamin
January 2020
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(x - y)² - (x + y)² = - 8
Se (x – y)2 – (x + y)2 = - 8, então x . y é igual a:(A) 0 (D) 2(B) -1 (E) 4(C) -2
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Resultado tem que da 2
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andreyfrancawor
(x-y)² - (x+y)² = -8x² - 2xy +y² - ( x² + 2xy + y²) =- 8
x² - 2xy +y² - x² - 2xy - y² =- 8
- 4xy = -8
xy = - 8 /- 4
xy = 2
resposta letra D
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x² - 2xy +y² - x² - 2xy - y² =- 8
- 4xy = -8
xy = - 8 /- 4
xy = 2
resposta letra D