指数函数变换 by cemccourseware

指数函数变换 by cemccourseware
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2019-03-20 00:32
①本范例演示指数函数图像的平移、伸缩和反射变换;②涉及核心数学概念:指数函数性质、函数变换(平移、伸缩、反射)、坐标系;③作图要点:使用 GeoGebra 命令 If, Shuffle, Element, LaTeX, UnicodeToLetter, Textfield 构造函数图像及参数控制界面,对象包括 ansB, k, h, wholeList, aWhole, aWholeFrac, a, bWhole, bWholeFrac, b, txtB, c, txtInnerFactored, bList, aList 等;④适合高中数学教学,用于理解指数函数变换规律

GeoGebra 命令及参数

  1. If(Random[1, 2] ≟ 1, Random[-7, -1], Random[1, 7]) → k
  2. If(Random[1, 2] ≟ 1, Random[-7, -1], Random[1, 7]) → h
  3. Shuffle(1…4) → wholeList
  4. Element(wholeList, 1) → aWhole
  5. If(Random[1, 2] ≟ 1, aWhole, 1 / aWhole) → aWholeFrac
  6. If(Random[1, 2] ≟ 1, (aWholeFrac * (-1)), aWholeFrac) → a
  7. Element(wholeList, 2) → bWhole
  8. If(Random[1, 2] ≟ 1, bWhole, 1 / bWhole) → bWholeFrac
  9. If(Random[1, 2] ≟ 1, (bWholeFrac * (-1)), bWholeFrac) → b
  10. If(b ≟ -1, "-", If[b ≟ 1, "", NumToImproperFrac[b]]) → txtB
  11. LaTeX(((((txtB * "\left(x") * If[c ≟ 0, "", If[(b * h) < 0, "-", "+"]]) * NumToImproperFrac[abs(h)]) * "\right)")) → txtInnerFactored
  12. UnicodeToLetter(10007) → xmark
  13. UnicodeToLetter(10003) → cmark
  14. Textfield(textA) → ansAbox
  15. Textfield(textH) → ansHbox
  16. Textfield(textK) → ansKbox
  17. LaTeX("\text{Vertical \hspace{140} by a factor of}") → verStretchCompress2
  18. LaTeX("\text{Reflection in the \(x\)-axis}") → reflectX
  19. LaTeX("\text{Translation \hspace{80} by \hspace{50} unit(s)}") → horTranslate2
  20. LaTeX("\text{Translation \hspace{80} by \hspace{50} unit(s)}") → verTranslate2
  21. LaTeX("\text{Vertical translation}") → verTranslate1
  22. LaTeX("\text{Vertical stretch or compression}") → verStretchCompress1
  23. LaTeX("\text{Horizontal translation}") → horTranslate1
  24. Textfield(textB) → ansBbox
  25. LaTeX("\text{Reflection in the \(y\)-axis") → reflectY
  26. Shuffle({2, 3, 4, 5, 1 / 2, 1 / 3, 1 / 4, 1 / 5}) → possibleBaseValues
  27. Element(possibleBaseValues, 1) → base
  28. LaTeX((("\text{\textbf{Question: }Identify the transformations.\\\textbf{Instructions: }Select and describe all of the transformations that are applied to \(f(x)=(" * FractionText[base]) * ")^x\)\\to obtain the function shown below.}")) → TEXT
  29. LaTeX((((txtB * "x") * If[h ≟ 0, "", If[(b * h) > 0, "-", "+"]]) * NumToImproperFrac[abs((b * h))])) → txtInnerExpanded

AI 绘图提示语参考

绘制指数函数的变换图形,展示平移、伸缩和反射。随机生成垂直伸缩因子和水平平移量,绘制基础指数函数和变换后的函数图像。标注关键变换参数,如垂直伸缩系数和水平平移距离,并用文字说明各变换类型。先绘制基础函数,再依次展示平移、伸缩和反射效果,最后标注各变换参数和类型。
以上提示语为根据原始绘图命令整理而来,仅供参考。