9. {0, 2}
11. {0, 1}
13. {0}
15. {−1, 0, 1}
17. {0, 3}
19. {14, 2}
21. {1−2–√, 1+2–√}
23. {72−53−−√2, 72+53−−√2}
25. {−3, 5}
27. {126, 5}
29. ∅
31. ∅
33. {−1}
35. {−2, 7}
37. {3}
39. ∅
41. {−2}
43. {3}
45. {6}
47. {−2, 1}
49. {3, 7}
51. {0, 8}
53. {9}
55. {−2}
57. {3, 7}
59. {13}
61. {−245, 6}
63. {4, 9}
65. {14, 49}
67. {−16, 17}
69. {8, 64}
71. {116}
73. {−3,−2, 2, 3}
75. {−2–√2, 2–√2,−i, i}
77. {−2, 2}
79. {0, 13}
81. {0}
83. {−22–√,−3–√, 3–√, 22–√}
85. {−1, 1, 2, 4}
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