вычислите (5/9 : 10/13) * 5 1/7

5/9 : 10/13 = 5/9 × 13/10 = 13/18 (сокращаете 10 и 5)

13/18 × 5 1/7 = 13/18 × 36/7 = 26/7 = 3 5/7 (сокращаете 18 и 36)

1) 5/9:10/13=5/9*13/10=13/18;

2)13/18*36/7=26/7