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Author:
洪馷孺
GeoGebra
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兩位數加法
小数 的副本
兩組對邊相等和有直角的四邊形
三位數除以一位數（一）
四邊形的特性
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定理7.1&7.2
ie 5
假的龍珠
黃金矩形
圓 點 直線 的複本
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Vectors 3D (Three-Dimensional)
Trigonometric Functions
Limits
Statistical Characteristics
Correlation