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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
sanjiaohanshu
找出對稱軸
Nested spiral octagon
兩組對邊相等和有直角的四邊形
畫出對稱圖形
Discover Resources
整數或分數÷分數_ 工作紙（一）_題3b
Calculus
正四面體的旋轉對稱
Rotational Symmetry的副本
翰林數學_1下_CH2-1_直角坐標平面的認識象限
Discover Topics
Right Triangles
Sphere
Plane Figures or Shapes
Sine
Normal Distribution