Пошаговое объяснение:
1) 8 9/20 × 2/13 = 169/20 × 2/13 = 13/10
2) 5 1/3 × 3/8 = 16/3 × 3/8 = 2
3) 10 1/2 × 2/7 = 21/2 × 2/7 = 3
4) 5/6 × 1 6/5 = 5/6 × 11/5 = 11/6 = 1 5/6
5) 3 1/9 × 3/8 = 28/9 × 3/8 = 7/6 = 1 1/6
6) 9 1/7 × 3/4 = 64/7 × 3/4 = 48/7 = 6 6/7
7) 10 1/5 × 10/17 = 51/5 × 10/17 = 6
8) 3/11 × 5 1/2 = 3/11 × 11/2 = 3/2 = 1 1/2
