23 × 5^3 - 56(3) + 1

23 * 53 - 56/3 + 1 = 23 * 5 * 5 * 5 - 56/3 + 1= 23 * 125 + 56/3 + 1 = 2 875 + 56/3 + 1 = 2 875 + 18, 66 + 1 = 2 893,66 + 1 = 2 894, 66. Ответ: 23 * 53 - 56/3 + 1 = 2 894, 66.