реши без пояснений

1. (3!)/6 = 6/6 = 1

2. (4!)/24 = 24/24 = 1

3. (5!)/120 = 120/120 = 1

4. (6!)/720 = 720/720 = 1

5. C(4,1) = 4

6. C(5,2) = 10

7. C(4,4) = 1

π * 1/4 = π/4 π * 2/5 = 2π/5 π * 4/5 = 4π/5

1. 10/99
2. 14/111
3. 15/112