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正方形中的45度摺紙

Author:鍾元杰

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兩組對邊相等的四邊形
兩位數加法
四邉形 (四年級) 教師版
算柱 (兩位數)
拼砌四邊形

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Rectangle _03
Triangle
三元大作戰-勾選版
指令
小立方体组合的三视图【鼠标拖动法】

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Constructions
General Quadrilateral
Secant Line or Secant
Scalene Triangles
Kite

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