8целых 9/20 *2/13 , 5 целых 1/3 *3/8 , 10 целых 1/2* 2/7 ,5/6 *1 целая 6/5 , 3 целых 1/9*3/8 , 9 целых 1/7 *3/4 ,10 целых 1/5 *10/17 , 3/11*5 целых 1/2

8 9/20 *2/13 =169/20×2/13=13/10=1 3/10

5 1/3 *3/8 = 16/3×3/8=2

10 1/2* 2/7 = 21/2×2//7=3

5/6 *1 6/5 = 5/6×11/5=11/6=1 5/6

3 1/9*3/8 = 28/9×3/8=7/6=1 1/6

9 1/7 *3/4 = 64/7×3/4=48/7=6 6/7

10 1/5 *10/17 = 51/5×10/17=6

3/11*5 1/2=3/11×11/2=3/2=1 1/2