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餘弦的定理
Author:
NG Chun Yee
GeoGebra
New Resources
四邊形的特性
兩位數除以一位數（一）
GeoGebra笔记功能体验课件
三位數除以一位數（一）
找出對稱軸
Discover Resources
梯形的面積
有趣
locus of a segment
面積的認識4
我的第一个GGB绘本
Discover Topics
Bar Chart or Bar Graph
Area
Rational Numbers
Differential Equation
Normal Distribution