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常见四边形是否是双心四边形
Author:
孟宝兴
GeoGebra
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兩組對邊相等的四邊形
畫出對稱圖形
兩組對邊相等和有直角的四邊形
画直线等分三角形的面积
找出對稱軸
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包含除法（整數÷整數）
正n凸多邊形旋轉對稱／反射對稱
(001)80102史巧薇
双动点求三角形最大面积演示
存款模擬程式
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Rational Numbers
Ratios
Plane Figures or Shapes
Median Value
Step Functions