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徐熙伟
GeoGebra
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四邊形的特性
兩組對邊相等和有直角的四邊形
GeoGebra笔记功能体验课件
兩位數除以一位數（一）
找出對稱軸
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分數與小數
Opening Box
創作一個相同周界的封閉平面圖形
Addition and Subtraction of Polynomials 2 (多項式的加減法2)
三角形n邊形外角和
Discover Topics
Natural Numbers
Prism
Arithmetic Operations
Perimeter
Parametric Curves