Question

me ajuda a calcular as soma

(obs preciso da conta)

Answer 1

  1)
  x = 2/5 , y = 1/2
  A = (x - y)/xy = (2/5 - 1/2)/(2/10)  A = (4/10 - 5/10)/(2/10)   A = (-1/10)/(2/10) = -1/2 = -0.5
  2)
  ((a² + b² - c²)² - (a² - b² + c²)²)/(4ab² + 4abc)    (4a²b² - 4a²c²)/(4ab² + 4abc) = (a²b² - a²c²/(ab² + abc)     a²/ab * (b² - c²)/(b + c) = a/b * (b - c) = a*(b - c)/b (A)
  3)
  1/((a - b)*(a - c)) + 1/((b - a)*(b - c)) + 1/((c - a)*(c - b)) = 0
  B) sempre 0