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三角形内角和
Author:
谢鹏
GeoGebra
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算柱 (兩位數)
拼砌四邊形
GeoGebra笔记功能体验课件
球体的体积推导（优化版）
異分母分數減法
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畢氏定理證明(光華國中103資)
Values of nCr & nPr 排列與組合的值
JAY三角
周界2
鉛筆畫圓
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Subtraction
Sphere
Normal Distribution
Area
Similar Triangles