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cherry910502
GeoGebra
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球体的体积推导（优化版）
找出對稱軸
四邉形 (四年級) 教師版
兩位數除以一位數（一）
第八周作业
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分數加法和減法
Basketball
兩數相加
徐州2015中考-28
椭圆的生成
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Translation
Upper and Lower Sum or Riemann Sum
Kite
Congruence
Limits