5 * 2 1/5,3 3/5*1 1/9, 4 2/7*2,2 14/15*6 6/11, 2 2/25*1 9/16,13/43*8 7/26.

1). 5 * 2 1/5 = 5 * 11/5 = 5 * 11 / 5 = 11;

2). 3 3/5 * 1 1/9 = 18/5 * 10/9 = 18 * 10/5 * 9 = 2 * 2 = 4;

3). 4 2/7 * 2 = 30/7 * 2 = 30 * 2 / 7 = 60/7 = 8 4/7;

4). 2 14/15 * 6 6/11 = 44/15 * 72/11 = 44 * 72/15 * 11 = 96/5 = 19 1/5 = 19,2;

5). 2 2/25 * 1 9/16 = 52/25 * 25/16 = 52 * 25/25 * 16 = 13/4 = 3 1/4 = 3,25;

6). 13/43 * 8 7/26 = 13/43 * 216/26 = 13 * 215/43 * 26 = 5/2 = 2 1/2 = 2,5;