P2减法演示

几何画板及绘图内容加载中，请稍等……

2017-09-25 11:12

多边形立体几何几何作图

①本范例演示了P2减法的数学原理与计算过程；②涉及的核心数学概念包括数字运算、十进制减法、几何图形（多边形、金字塔）的表示；③作图要点提炼自构造摘要，使用了Textfield、Polygon、If、Mod、Div等GeoGebra命令与对象；④适合小学及以上学段学习减法运算、几何图形表示及编程逻辑思维训练。

GeoGebra 命令及参数

Textfield(Subtrahend) → InputBoxDividend
Textfield(div) → InputBoxDivisor
Polygon(Co2, Co3, Co4, Co1) → RegionTen, RegTenS1, RegTenS2, RegTenS3, RegTenS4
Polygon(Co3, Co5, Co6, Co4) → RegionOne, RegOneS1, RegOneS2, RegOneS3, RegOneS4
If(ShowChi, "被減數", "Minuend") → text1Minuend
If(ShowChi, "減數", "Subtrahend") → text2Subtrahend
If(ShowChi, "顯示差", "Show the difference") → text6ShowAns
If(ShowChi, "註：程式只會把左上角的一條變成十粒數粒。", "Note: Only the bar at the upper left corner will be changed to 10 squares.") → Instruction2
Polygon(BoxCo1, BoxCo3, BoxCo4, BoxCo2) → RegionBox, boxco1, boxco3, boxco4, boxco2
If(ShowChi, "取去代表減數的數粒。", " Take away the squares representing the subtrahend.") → Instruction1
Mod(Subtrahend, 10) → One
Div(Subtrahend, 10) → Ten