百分数的计算
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①本范例使用双数轴演示如何估算和计算一个数的百分比;②涉及的核心数学概念包括百分比计算、数轴应用;③作图要点——从下方『构造摘要』提炼用到了Segment, Point, Sequence, If, Vector, Intersect, Textfield, OrthogonalLine等GeoGebra命令/对象;④适合初中数学教学,帮助学生理解百分比的实际应用。
GeoGebra 命令及参数
Segment(D, C) → aSegment(A, B) → bPoint(b) → ESequence(A + ((1, 0) * k), k, 1, 9) → list1If(level1, (10 * Random[1, 9]), If[level2, (5 * Random[1, 19]), Random[5, 95]]) → cPoint(b) → GVector(H, I) → uVector(J, F) → vVector(L, M) → wSegment(K, N) → fSequence((0, -3) + ((1, 0) * j), j, 1, 9) → list2Intersect(f, yAxis) → OPoint(f) → PIf(level1, (10 * Random[1, 10]), If[level2, (10 * Random[1, 30]), Random[5, 95]]) → gSegment(O, P) → hPoint(h) → QTextfield(estimate) → inputBox1Textfield(FinalAnswer) → inputBox2Vector(R, S) → jOrthogonalLine(G, f) → kOrthogonalLine(F, f) → lIntersect(l, f) → TVector(F, T) → m