有向数减法 - 电梯模型
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本范例通过电梯模型演示有向数的减法。核心数学概念包括有向数和减法。使用了Intersect, Point, CircleArc, Sequence, PathParameter, Corner, Polygon, Segment, Vector, Translate等GeoGebra命令。适合初中及以上学生学习有向数运算。
GeoGebra 命令及参数
Intersect(xAxis, yAxis) → OPoint(yAxis) → CPoint(xAxis) → BCircleArc(O, B, C) → cPoint(c) → ASequence(Translate[O, Vector[(i * UnitVector[Vector[O, A]])]], i, -6, 7) → l1Sequence(Translate[O, Vector[((0.1 * i) * UnitVector[Vector[O, A]])]], i, -200, 200) → l3Point(l1) → PPathParameter(A) → tPathParameter(P) → aCorner(5) → DimenPoint(Ray[D + (0, 1), D + (0, 2)]) → FPolygon((x(Corner[2]), 0), (x(Corner[1]), 0), Corner[1], Corner[2]) → q1, g, h, i, jSequence(Text[i, Translate[O, (-0.2, -0.7) + (t * (0.5, 0.6)) + If[i ≥ 0, (0.1, 0), (0, 0)] + (i * UnitVector[Vector[O, A]])]], i, -6, 7) → l2Segment((0, 8), (0, -6)) → fVector(P + (1.5, 0), Q) → uTranslate(P, u) → P'Polygon(T, U, U + (0, 1), T + (0, 1)) → q2, k, l, m, nSegment(Q - (0.25, 0), Q + (0.25, 0)) → pSegment(V - (0.25, 0), V + (0.25, 0)) → qSegment(V - (0.25, 0), P) → rSegment(Q - (0.25, 0), T) → s