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陳兪宏
阿凱老師的幾何問題
GeoGebra
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拼砌四邊形
三位數除以一位數（二）
四邉形 (四年級) 教師版
【案例】2013年安徽高考15题
柱體建築師
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How to reconstruct a quadrilateral farm to a triangular one with the same area?
Quiz on Discriminant 判別式：測驗
生长弧
我的第一个GGB绘本
星形线-Astroid Curve-with-Envelope Command
Discover Topics
Percentages
Rectangle
Normal Distribution
Right Triangles
Indefinite Integral