| | | | 514 | | 9 | | | | | | | | | | | | | | | | | | | | | | | 5 | | | 1 | | | | | 1 10 | 5 10 20 | 10 20 | 15 | | | | | | 1. 20 | | 2. 1 10 | 2 | 3. 10 20 | 3 | 4. 20 | 4 | 5. | 1 4 | | | | | 1. | 2. | 20 | | | | | | | 2020 9 | | | | | A B | | | | | | 12 30 | | | | 5 8 | | | 2020 3 16 | | |