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與三個半圓相切之圓家封閉面積
Author:
張道民
GeoGebra
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三位數除以一位數（二）
GeoGebra笔记功能体验课件
拼砌四邊形
四邊形的特性
異分母分數減法
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亂數取值 by java
carrito
線性組合1：正六邊形
花瓣紋章
繪畫梯形
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Tree Diagrams
Kite
Planes
Numbers
Surface