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odp. D
(1 + V2)^3 = 1^3 + 3 * 1^2 * V2 + 3 * 1 * (V2)^2 + (V2)^3 = 1 + 3V2 + 6 + 2V2 = 5V2 + 7
odp. C
1/3 - 1/V3 = 1/3 - V3/3 = (1 - V3)/3