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Author:
yhf
GeoGebra
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找出對稱軸
畫出對稱圖形
GeoGebra笔记功能体验课件
三位數除以一位數（二）
錐體建築師
Discover Resources
百分數（小學）：折扣 / 賺賠（Java 版）
Expansion & Factorization 展開與因式分解
選擇合適的「中間人」
ie 4
球體體積圖解
Discover Topics
Subtraction
Optimization Problems
Rectangle
Arithmetic Mean
Conic Sections