1) 6 8/15 - 4 21/25 = 98/15 - 121/25 = 490/75 - 363/75 = 127/75 2) 127/75 * 4,5 = 127/75 * 45/10 = 127/15 * 9/10 = 1143/150 3) 2 1/6 * 0,52 = 13/6 * 52/100 = 13/3 * 26/100 = 338/300 4) 1143/150 - 338/300 = 2286/300 - 338/300 = 1948/300 = 6 148/300 = 6 74/150 = 6 37/75 Ответ: 6 37/75