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4. , (5, 0) 2: 1.
5. , ( 1, 0) = 4.
6. , (2, 0) 5 + 8 = 0 5: 4.
7. , (4, 0), B(1, 0).
8. , (2, 0) 2 + 5 = 0 5: 4.
9. , (3, 0) B (26, 0).
10. , (0, 2) y 4 = 0.
11. , x2 + y2 = 4x.
12. , (2, 6) y + 2 = 0.
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14. , (0, 1) y + 5 = 0.
15. , (2, 0) x 6 = 0. .
16. , (4, 0), (4, 0), . .
17. , (2, 0) = 3.
18. , (2, 1) 4 + 6 = 0 3: 4.
19. , (2, 0), (4, 1).
20. , (1, 0) 2 + 5 = 0 4: 5.
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