直接与部分变量关系演示
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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
UnicodeToLetter(10007) → xmarkUnicodeToLetter(10003) → cmarkRandom(1, 5) → mDirectTempRandom(1, 5) → mPartialTempRandom(1, 5) → bPartialIf(Random[1, 2] ≟ 1, mDirectTemp, 1 / mDirectTemp) → mDirectIf(Random[1, 2] ≟ 1, mPartialTemp, 1 / mPartialTemp) → mPartialRandom(1, 2) → typeLaTeX((("\textbf{Question: }Which line represents a \textbf{" * If[type ≟ 1, "direct", "partial"]) * "} variation?")) → QUESTIONLaTeX((("\textbf{Instructions: }Select the line on the graph that represents a \textbf{" * If[type ≟ 1, "direct", "partial"]) * "} variation.")) → INSTRUCTIONSPolygon({(-1, -1), (-1, 10.5), (12.5, 11), (12.5, -1)}) → viewBoxMin(12.5, 10.5 / mDirect) → directLineMaxXMin(12.5, (10.5 - bPartial) / (mPartial)) → partialLineMaxX