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Author:
Leung Chun Kit
GeoGebra
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拼砌四邊形
近似值：有效數字
算柱 (兩位數)
小数 的副本
兩位數加法
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認識函數值
GGB5_3D:平面截痕
BkD_act15_02c
拋物線1--焦點法
等轴双曲线
抛物线的定义
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Conic Sections
Inequalities
Hyperbola
Random Experiments
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