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GeoGebra
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異分母分數減法
兩組對邊相等和有直角的四邊形
兩位數加法
四邉形 (四年級) 教師版
【案例】2013年安徽高考15题
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張春興0302
聖者即正義
求三棱锥体积
畢氏定理實作
對稱之美
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Angles
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Cone
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