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平行線法
Author:
chen mingchuan
GeoGebra
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四邉形 (四年級) 教師版
兩位數加法
画直线等分三角形的面积
四邊形的特性
判斷球體
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Dividing a Trapezium
緯度、日照、影長
應用圓周率: 題3
Graph of Sine
对多边形对角线、内角和、外角和的理解
Discover Topics
Translation
Arithmetic
Tangent Line or Tangent
Trigonometry
Solids or 3D Shapes