直接与部分变量关系演示

直接与部分变量关系演示
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2018-11-17 04:57
①本范例演示了直接变量与部分变量关系的图形表示;②涉及核心数学概念包括线性方程、预期值、相似三角形、梯形、参数曲线;③构造中使用了UnicodeToLetter, Random, If, LaTeX, Polygon, Min等GeoGebra命令与对象;④适合初中及以上数学教学,用于理解变量关系与几何作图。

GeoGebra 命令及参数

  1. UnicodeToLetter(10007) → xmark
  2. UnicodeToLetter(10003) → cmark
  3. Random(1, 5) → mDirectTemp
  4. Random(1, 5) → mPartialTemp
  5. Random(1, 5) → bPartial
  6. If(Random[1, 2] ≟ 1, mDirectTemp, 1 / mDirectTemp) → mDirect
  7. If(Random[1, 2] ≟ 1, mPartialTemp, 1 / mPartialTemp) → mPartial
  8. Random(1, 2) → type
  9. LaTeX((("\textbf{Question: }Which line represents a \textbf{" * If[type ≟ 1, "direct", "partial"]) * "} variation?")) → QUESTION
  10. LaTeX((("\textbf{Instructions: }Select the line on the graph that represents a \textbf{" * If[type ≟ 1, "direct", "partial"]) * "} variation.")) → INSTRUCTIONS
  11. Polygon({(-1, -1), (-1, 10.5), (12.5, 11), (12.5, -1)}) → viewBox
  12. Min(12.5, 10.5 / mDirect) → directLineMaxX
  13. Min(12.5, (10.5 - bPartial) / (mPartial)) → partialLineMaxX