在数轴上放置整数

在数轴上放置整数
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2016-05-27 02:29
①本范例演示如何在数轴上放置和表示整数;②涉及的核心数学概念为数轴、整数、数的位置关系;③作图要点——从下方『构造摘要』提炼用到了 Sequence(数列)、Shuffle(随机排序)、Join(连接)、Element(元素)、Point(点)、Segment(线段)、Vector(向量)等 GeoGebra 命令/对象;④适合初中数学教学,用于帮助学生直观理解整数的顺序和位置。

GeoGebra 命令及参数

  1. Sequence(RandomElement[{-1, 1}], i, 1, 4) → signs
  2. Shuffle({1, 2, 3, 4, 5, 6, 7, 8, 9}) → list2, {5, 1, 3, 6, 9, 8, 4, 7, 2}
  3. Join({First[list2, n + 1], Sequence[0, i, 1, n - 1]}) → list3
  4. Sequence(First[Shuffle[list3], n + 1], i, 1, 100) → list4
  5. Sequence(First[Element[list4, i], n], i, 1, 100) → list5
  6. Sequence(Sum[Sequence[(Element[list5, i, k] * 10^(n - k)), k, 1, n]], i, 1, 100) → matrix1
  7. Shuffle(Unique[matrix1]) → list6, {530, 560, 506, 53, 536, 61, 360, 503, 500, 30, 306, 51, 105, 31, 653, 106, 605, 136, 63, 510, 163, 600, 501, 60, 103, 651, 561, 153, 160, 130, 300, 516, 310, 316, 150, 305, 1, 601, 650, 5, 6, 165, 531, 100, 630, 3, 36, 631, 10, 56, 16, 15}
  8. Element(list6, 1) → one
  9. Element(list6, 2) → two
  10. Element(list6, 3) → three
  11. Element(list6, 4) → four
  12. Element(list6, 5) → five
  13. Element(list6, 6) → six
  14. Element(list6, 7) → seven
  15. Element(list6, 8) → eight
  16. Element(list6, 9) → nine
  17. Element(list6, 10) → ten
  18. Point(y = 0) → A
  19. Point(y = 0) → B
  20. Point(y = 0) → C
  21. Point(y = 0) → D
  22. Point(y = 0) → E
  23. Point(y = 0) → F
  24. Point(y = 0) → G
  25. Point(y = 0) → H
  26. Point(y = 0) → I
  27. Point(y = 0) → J
  28. Segment(K, L) → b
  29. Segment(M, Z) → f
  30. Vector(A, N) → u
  31. Vector(B, O) → v
  32. Vector(C, P) → w
  33. Vector(D, Q) → a
  34. Vector(E, R) → c
  35. Vector(F, S) → d
  36. Vector(G, T) → e
  37. Vector(H, U) → g
  38. Vector(I, V) → h
  39. Vector(J, W) → i