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六上：圆的面积公式推导
Author:
钟秀群
Topic:
Circle
GeoGebra
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GeoGebra笔记功能体验课件
錐體建築師
拼砌四邊形
兩位數加法
四邊形的特性
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斜率 - 概念及定義 (1)
謝爾賓斯基三角形(Sierpinsky)
角的大小與角兩臂的長度有關？
中研院數學所
正多邊形邊上點旋轉
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Square
Functions
Exponential Functions
Linear Equations
Exponent