a) 630 = 63 * 10 = 7 * 9 * 2 * 5 = 7 * 3 * 3 * 2 * 5
б) 990 = 99 * 10 = 9 * 11 * 2 * 5 = 3 * 3 * 11 * 2 * 5
в) 3512 = 1756 * 2 = 2 * 878 * 2 = 2 * 2 * 439 * 2
г) 1840 = 20 * 92 = 2 * 10 * 2 * 46 = 2 * 2 * 5 * 2 * 23
д) 500 = 5 * 100 = 5 * 10 * 10 = 5 * 2 * 5 * 2 * 5
e) 48 = 6 * 8 = 2 * 3 * 2 * 4 = 2 * 3 * 2 * 2 * 2