9 2/9*9 = 8 3/28*5 = 6 3/8*2=

Первый пример.

9 2/9 * 9 = 83;

9 2/9 * 9/1 = 9 * 9 + 2/9 * 9/1 = 83/9 * 9/1 = 83 * 9/9 * 1 = 747/9 = 83 * 9/1 * 9 = 83/1 = 83;

Второй пример.

8 3/28 * 5 = 40 15/28;

8 3/28 * 5/1 = 8 * 28 + 3/28 * 5/1 = 227/28 * 5/1 = 227 * 5/28 * 1 = 1135/28 = 15 + 40 * 28/28 = 40 15/28;

Третий пример.

6 3/8 * 2 = 12 3/4;

6 3/8 * 2/1 = 6 * 8 + 3/8 * 2/1 = 51/8 * 2/1 = 51 * 2/8 * 1 = 102/8 = 51 * 2/4 * 2 = 51/4 = 3 + 12 * 4/4 = 12 3/4.