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Author:
chen mingchuan
GeoGebra
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兩位數除以一位數（二）
拼砌四邊形
異分母分數減法
兩組對邊相等和有直角的四邊形
兩位數加法
Discover Resources
Erdos-Mordell 不等式
平行四邊形面積
Copy of 劉徽的「割圓術」
構作對稱圖形_FK1
operations of matrix 2rd ver
Discover Topics
Perimeter
Rotation
Boxplot
Quadratic Equations
Square