January 2020 1 96 Report
(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
Faca o calculo...
Resultado tem que da 2
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