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chen mingchuan
GeoGebra
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兩組對邊相等和有直角的四邊形
四邉形 (四年級) 教師版
異分母分數減法
兩位數加法
兩組對邊相等的四邊形
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講義P80 剪出現對稱圖形.ggb
動畫軌跡御飯糰
电子表格建点
同位角
维纳斯的身高 (简易版)
Discover Topics
Interest Calculation
Trigonometric Functions
Continuity
Constructions
Similar Triangles