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"拈" 類遊戲之一-搶21遊戲 The 21 game
Author:
侯杰材
GeoGebra
New Resources
異分母分數減法
球体的体积推导（优化版）
兩組對邊相等和有直角的四邊形
四邉形 (四年級) 教師版
三位數除以一位數（一）
Discover Resources
立方體拿走4塊
Proof of Pythagoras Theorem(1) 畢氏定理的証明(1)
各種五邊形
閱讀月曆（綜合版）
幻彩圆
Discover Topics
Optimization Problems
Logarithmic Functions
Circle
Division
Volume