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分數加法
Author:
iedc
GeoGebra
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画直线等分三角形的面积
兩組對邊相等的四邊形
錐體建築師
三位數除以一位數（二）
找出對稱軸
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反正切函數
Quiz on Conditions for Congruence of Triangles 全等三角形的判定條件：測驗
動態文字2次函數
Rotational symmetry of triangular prism
六年級 圓周
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Secant Line or Secant
Volume
Quadratic Functions
Functions
Geometric Transformations