9. −2
11. −6
13. −7
15. 13972
17. a−b
19.
−10
2
0
21.
−4
4
−2
23. −2
25. 12
27. 0
29. 42
31. 16
33. 49
35. a3+b3
37. a3+b3+c3−3abc
39. {(3, 5)}
41. {(1, 2)}
43. {(2, 0)}
45. {(32y+2, y)}
47. {(2, 3)}
49. {(1, 1, 0)}
51. {(1,−1, 3)}
53. {(1, 1, 1)}
55. {(1, 2, 3)}
57. {(1, 2, 3)}
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