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a = -1/3
b = -0,5
4 - 3 * (1/3)^2 + 4 * (-0,5)^3 = 4 - 1/9 + 4 * (-0,125) = 36/9 - 1/9 - 0,5 = 35/9 - 0,5 =
35/9 - 5/10 = 350/90 - 45/90 = 305/90 = 61/45 = 1 i 16/45