1 / 2 = 1 / 1 * 2 = 1 / 1 / 2, 1 / 6 = 1 / 2 * 3 = 1 / 2 - 1 / 3, 1 / 12 = 1 / 3 * 4 = 1 / 3 / 4. 계산 1 / (x - 2) (x - 3) - 2 / (x - 1) (x - 3) + 1 / (x - 1) (x - 2)

1 / 2 = 1 / 1 * 2 = 1 / 1 / 2, 1 / 6 = 1 / 2 * 3 = 1 / 2 - 1 / 3, 1 / 12 = 1 / 3 * 4 = 1 / 3 / 4. 계산 1 / (x - 2) (x - 3) - 2 / (x - 1) (x - 3) + 1 / (x - 1) (x - 2)