Выполните умножение устно и запишите результаты: 3/5 * 15 = 1/2 * 3/4 = 5/6 * 0 = 2/7 * 21 = 4/7 * 1/2 = 1 * 1 8/9 =

3/5 * 15 = 9 1/2 * 3/4 = 3/8 5/6 * 0 = 0 2/7 * 21 = 6 4/7 * 1/2 = 2/7 1 * 1 8/9 = 1 8/96 * 2/3 = 4 5/8 * 4/9 = 5/18 10 2/7 * 1 = 10 2/74 * 1/4 = 1 3/5 * 20/15 = 4/5 0 * 7/20 = 0