9*40*5*25*4 решить распределительным свойством

9 * 4 0 * 5 * 25 * 4 = 9 * 4 * 10 * 5 * 25 * 4 = 36 * 10 * 5 * 25 * 4 = 36 * 10 * 20 * 25 = 36 * 1 * 10 * 2 * 10 * 25 = 36 * 1 * 10 * 2 * 10 * 25 = 36 * 2 * 100 * 25 = 72 * 25 * 100 = (70 + 2) * (20 + 5) * 10 = (70 * 20 + 70 * 5 + 2 * 20 + 2 * 5) * 10 = (1400 + 350 + 2 * 20 + 2 * 5) * 10 = (1400 + 350 + 40 + 10) * 10 = (1400 + 300 + 50 + 40 + 10) * 10 = (1700 + 50 + 40 + 10) * 10 = (1700 + 90 + 10) * 10 = (1700 + 90 + 10) * 10 = (1700 + 100) * 100 = 1800 * 100 = 180000

ответ: 180000