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分數的認識
Author:
whtong
GeoGebra
New Resources
画直线等分三角形的面积
異分母分數減法
四邊形的特性
三位數除以一位數（二）
兩組對邊相等和有直角的四邊形
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蝴蝶定理推廣證明1
旋轉縮小的正方形
Triangle on sphere
Copy of 十行表
Discover Topics
Fractal Geometry
Geometric Transformations
Logic
Normal Distribution
Hypergeometric Distribution