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负整数加法演示

负整数加法演示
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2016-09-30 01:49
向量解析几何几何作图
①本范例演示在数轴上如何进行负整数加法运算；②涉及的核心数学概念包括数轴、负整数、加法运算规则；③作图要点——使用了Segment（线段）、NumberLine（数轴）、Point（点）、Midpoint（中点）、Vector（向量）等GeoGebra命令与对象；④适合初中数学教学，用于帮助学生直观理解负整数加法的几何意义。

GeoGebra 命令及参数

  1. Segment(StartPoint, EndPoint) → NumberLine
  2. Textfield(inputans) → InputBox1
  3. RandomElement({-10, -9, -8, -7, -6, -5, 5, 6, 7, 8, 9, 10}) → posint
  4. Random(-15, -1) → negint
  5. Segment(Origin, (0, -3)) → connect1
  6. LaTeX(Text["\checkmark"]) → RightCheck
  7. LaTeX(Text["×"]) → WrongCheck
  8. Text(negint + posint) → correctans
  9. Point(Num1Height) → Num1Point
  10. Point(Num2Height) → Num2Point
  11. Segment(Num2Point, (x(Num2Point), 0)) → connect3
  12. LaTeX(Text["Model\ the\ sum\ on\ the\ number\ line.\ Then,\,complete\ the\ addition\ statement."]) → Instructions1
  13. LaTeX(Text[position1]) → Highlight1Display
  14. LaTeX(Text[position2]) → Highlight2Display
  15. Segment(Num1Point, (x(Num1Point), 0)) → connect2
  16. Circle((i1, height), r) → C1
  17. Circle((i2, height), r) → C2
  18. Circle((i3, height), r) → C3
  19. Circle((i4, height), r) → C4
  20. Circle((i5, height), r) → C5
  21. Circle((i6, height), r) → C6
  22. Circle((i7, height), r) → C7
  23. Midpoint((0, 1.2), Num1Point) → Num1DisplayLocation
  24. Midpoint((x(Num1Point), 2.4), Num2Point) → Num2DisplayLocation
  25. Sequence((i, 0), i, -30, 30, 1) → SmallTicks
  26. Sequence((i, 0), i, -30, 30, 5) → Ticks
  27. Vector((0, 2), Num1Point) → negvector
  28. Vector((x(Num1Point), 4), Num2Point) → posvector
  29. Circle((i8, height), r) → C8
  30. Circle((i9, height), r) → C9
  31. Circle((i10, height), r) → C10
  32. Circle((i0, height), r) → C0
  33. Circle((in1, height), r) → Cn1
  34. Circle((in2, height), r) → Cn2
  35. Sequence(Text[i, (i - 0.65, -1.7)], i, -30, 30, 5) → Numbers