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同心圓
Author:
許清惟
GeoGebra
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球体的体积推导(优化版)
四邊形的特性
畫出對稱圖形
三位數除以一位數(二)
異分母分數減法
Discover Resources
百分數(小學):折扣 / 賺賠(HTML5 版)
數線_小數的認識
微積分基本定理的副本
三视图积木
开关灯游戏 5×3
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Hyperbola
Tree Diagrams
Optimization Problems
Unit Circle
Derivative