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正三角形堆垛
Author:
柳淳珈
GeoGebra
New Resources
兩位數加法
画直线等分三角形的面积
兩位數除以一位數（一）
GeoGebra笔记功能体验课件
第八周作业
Discover Resources
Area of cirle
parallelogram
加法
截角八面體摺紙模板new
畢氏定理 (勾股定理) <Pythagorean theorem>
Discover Topics
Reflection
Symmetry
Stochastic Process or Random Process
Combinatorics
Arithmetic