6(1/3)³ - 17 1/3 = 6 * (4/3)³ - 17 1/3 = 6 * 64/27 - 17 1/3 = 6 * 64/27 - 52/3 = (6 * 64 - 52 * 9) / 27 = (384 - 468) / 27 = -84 / 27 = -28 / 9 = -3 1/9
Ответ: -3 1/9