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dse13

Author:Pokman Cheng

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畫出對稱圖形
兩位數加法
兩位數除以一位數（一）
GeoGebra笔记功能体验课件
找出對稱軸

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量度的誤差 Errors in Measurement
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數未學習社12/15
面積
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Constructions
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