有向数减法 - 电梯模型

有向数减法 - 电梯模型
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2020-06-06 15:17
本范例通过电梯模型演示有向数的减法。核心数学概念包括有向数和减法。使用了Intersect, Point, CircleArc, Sequence, PathParameter, Corner, Polygon, Segment, Vector, Translate等GeoGebra命令。适合初中及以上学生学习有向数运算。

GeoGebra 命令及参数

  1. Intersect(xAxis, yAxis) → O
  2. Point(yAxis) → C
  3. Point(xAxis) → B
  4. CircleArc(O, B, C) → c
  5. Point(c) → A
  6. Sequence(Translate[O, Vector[(i * UnitVector[Vector[O, A]])]], i, -6, 7) → l1
  7. Sequence(Translate[O, Vector[((0.1 * i) * UnitVector[Vector[O, A]])]], i, -200, 200) → l3
  8. Point(l1) → P
  9. PathParameter(A) → t
  10. PathParameter(P) → a
  11. Corner(5) → Dimen
  12. Point(Ray[D + (0, 1), D + (0, 2)]) → F
  13. Polygon((x(Corner[2]), 0), (x(Corner[1]), 0), Corner[1], Corner[2]) → q1, g, h, i, j
  14. Sequence(Text[i, Translate[O, (-0.2, -0.7) + (t * (0.5, 0.6)) + If[i ≥ 0, (0.1, 0), (0, 0)] + (i * UnitVector[Vector[O, A]])]], i, -6, 7) → l2
  15. Segment((0, 8), (0, -6)) → f
  16. Vector(P + (1.5, 0), Q) → u
  17. Translate(P, u) → P'
  18. Polygon(T, U, U + (0, 1), T + (0, 1)) → q2, k, l, m, n
  19. Segment(Q - (0.25, 0), Q + (0.25, 0)) → p
  20. Segment(V - (0.25, 0), V + (0.25, 0)) → q
  21. Segment(V - (0.25, 0), P) → r
  22. Segment(Q - (0.25, 0), T) → s