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