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平行線(方格版)
Author:
SIN MING WONG
GeoGebra
New Resources
四邉形 (四年級) 教師版
兩位數除以一位數（一）
判斷球體
三位數除以一位數（二）
畫出對稱圖形
Discover Resources
十字交乘法
工具箱
圓周 (圖形C)
gjc102a19 三角形的對折
圆在折线上滚动
Discover Topics
Linear Programming or Linear Optimization
Poisson Distribution
Similar Triangles
Logic
Tangent Line or Tangent