Ответ:

2. 1/50

Пошаговое объяснение:

1) 5. 3/7 : 1. 1/14 = 38/7 : 15/14 = 38/7 * 14/15 = 38/1 * 2/15 = 76/15 = 5. 1/15

2) 5. 1/15 - 2. 5/9 =

5. 3/45 - 2. 25/45 =

4. 48/45 - 2. 25/45 =

2. 23/45

3) 2. 23/45 * 1,8 =

2. 23/45 * 1. 8/10 =

2. 23/45 * 1. 4/5 =

113/45 * 9/5 = 113/5 * 1/5 = 113/25 = 4. 13/25

4) 3. 4/7 : 1. 3/7 =

25/7 : 10/7 = 25/7 * 7/10 = 25/10 = 2. 5/10 = 2. 1/2

5) 4. 13/25 - 2. 1/2 =

4. 26/50 - 2. 25/50 =

2. 1/50