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百分數（小學）：折扣 / 賺賠（Java 版）
Author:
Anthony OR 柯志明
HTML5 版：
http://ggbtu.be/m64174
GeoGebra
New Resources
拼砌四邊形
錐體建築師
兩位數加法
【案例】2018年全国1卷理科12题
異分母分數減法
Discover Resources
七巧板
各種四邊形
多項式函數係數改變之觀察
Area of a cricle by n-polygon
繪畫長方形
Discover Topics
Geometry
Straight Lines
Similarity Transformation or Similarity
Solids or 3D Shapes
Centroid or Barycenter