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异分母分数相加 by cemccourseware

异分母分数相加 by cemccourseware
几何画板及绘图内容加载中，请稍等……
2016-10-13 21:26
变换几何作图
本范例演示如何通过几何画板添加具有不同分母的分数。核心数学概念包括分数的加法。通过使用GeoGebra命令如Point、Segment、Random等，可以构造出分数相加的过程。适合小学高年级或初中学生学习分数加法。

GeoGebra 命令及参数

  1. Point(point2height) → Num2Point
  2. Segment(StartPoint, EndPoint) → NumberLine
  3. Random(-15, -1) → negint
  4. Random(1, 15) → posint
  5. LaTeX(Text["\checkmark"]) → RightCheck
  6. LaTeX(Text["×"]) → WrongCheck
  7. Textfield(inputnum) → InputBox1
  8. Point(point1height) → Num1Point
  9. Element(UnitsList, den - 2) → units
  10. Textfield(inputden) → InputBox2
  11. Midpoint((0, -0.08), Num1Point) → num1labelposition
  12. Midpoint((x(Num1Point), -0.16), Num2Point) → num2labelposition
  13. Sequence(Text["\dfrac{" + ((i * studentden)) + "}{" + studentden + "}", (i - 0.02, 0.11), true, true], i, x(StartPoint) + 0.1 + 1 / studentden, x(EndPoint) - 0.1 - 1 / studentden, 1 / studentden) → scale
  14. LaTeX(Text[num]) → correctnum
  15. LaTeX(Text["\dfrac{" + position1 + "}{" + studentden + "}"]) → H1Display
  16. LaTeX(Text["\dfrac{" + position2 + "}{" + studentden + "}"]) → H2Display
  17. Shuffle(factors) → factorsshuffled
  18. RandomElement({1, 2}) → den1index
  19. If(den1index ≟ 1, 2, 1) → s
  20. If(den1index ≟ 1, 2, 1) → den2index
  21. Vector((0, 0.07), (x(Num1Point), 0.07)) → negvector
  22. Vector((x(Num1Point), 0.14), (x(Num2Point), 0.14)) → posvector
  23. Segment(Origin, (0, 0.07)) → connect1
  24. Segment((x(Num1Point), 0.07), (x(Num1Point), 0)) → connect2
  25. Segment((x(Num2Point), 0.14), Solution) → connect3
  26. Segment((2.131014689984812, -0.3872718515349566), (2.267714689984812, -0.3872718515349566)) → fracline
  27. Sequence((i, 0), i, x(StartPoint) + 0.1, x(EndPoint) - 0.1, 1 / studentden) → SmallTicks
  28. Sequence((i, 0), i, x(StartPoint) + 0.1, x(EndPoint) - 0.1, 1) → Ticks