Пошаговое объяснение:
3) = 2/5 + 1 1/4а = 2/5 + 1 1/4 * 1 3/5 = 2/5 + 5/4 * 8/5 = 2/5 + 2 = 2 2/5
4) = 2 3/10 * 2 1/2 + 1/2 = 23/10 * 5/2 + 1/2 = 23/4 + 1/2 = 23/4 + 2/4 = 25/4 = 6 1/4
Пошаговое объяснение:
3) = 2/5 + 1 1/4а = 2/5 + 1 1/4 * 1 3/5 = 2/5 + 5/4 * 8/5 = 2/5 + 2 = 2 2/5
4) = 2 3/10 * 2 1/2 + 1/2 = 23/10 * 5/2 + 1/2 = 23/4 + 1/2 = 23/4 + 2/4 = 25/4 = 6 1/4