Пошаговое объяснение:
нод
30= 2 * 15 = 2 * 3 * 5.
48 = 2 * 24 = 2 * 2 *12 = 2 * 2 * 2 * 6 = 2 * 2 * 2 * 2 *3 = 2^4 * 3.
НОК (30;48) = 2^4 * 3 * 5 = 240
.25 = 1 * 25 = 5 * 5.
28 = 1 * 28 = 2 * 14 = 4*725 = 1 * 25 = 5 * 5.
28 = 1 * 28 = 2 * 14 = 4 * 7
