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分数减法演示 by James Monaghan

分数减法演示 by James Monaghan
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2017-05-05 18:29
解析几何几何作图
所属专题 Fractions and decimals
①本范例演示分数的减法运算过程及结果可视化；②涉及核心数学概念包括分数的分子分母运算、异分母分数通分、减法运算规则；③作图要点运用了Random（随机数生成）、If（条件判断）、FractionText（分数文本显示）、Numerator（分子）、Denominator（分母）等GeoGebra命令与对象；④适合初中数学教学，用于分数运算的直观教学与练习。

GeoGebra 命令及参数

  1. Random(2, denominator) → denominator1
  2. If(g, denominator1, Random[2, denominator]) → denominator2
  3. Random(2, denominator) → denominator3
  4. If(b, 1, Random[1, denominator1 - 1]) → numerator1
  5. If(b, 1, Random[1, denominator2 - 1]) → numerator2
  6. If(b, 1, Random[1, denominator]) → numerator3
  7. Random(1, 8) → number1
  8. Random(1, 4) → number2
  9. Random(1, 3) → number3
  10. FractionText(answer2fp) → answer2fptext
  11. FractionText(answer3fp) → answer3fptext
  12. FractionText(answer4fp) → answer4fptext
  13. Numerator(answer4) → answer4num
  14. Denominator(answer4) → answer4den
  15. FractionText(answer3) → answer3th
  16. FractionText(answer2) → answer2th
  17. FractionText(answer1a) → text19
  18. FractionText((answer1afp * (-1))) → text23
  19. FractionText(abs(answer1a)) → text29
  20. FractionText(abs(answer1afp)) → text30
  21. FractionText(answer4) → text7
  22. FractionText(abs(answer4fp)) → answer4fpabs
  23. FractionText(abs(answer3fp)) → answer3fpabs
  24. FractionText(answer3) → text40