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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
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GeoGebra笔记功能体验课件
兩位數除以一位數（一）
兩組對邊相等的四邊形
拼砌四邊形
找出對稱軸
Discover Resources
橢圓規
special
Sequence指令練習(二維)
Expansion & Factorization 展開與因式分解
Homework5
Discover Topics
Multiplication
Bar Chart or Bar Graph
Area
Linear Equations
Statistical Characteristics