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麟月元夭
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球體建築師
找出對稱軸
GeoGebra笔记功能体验课件
拼砌四邊形
球体的体积推导（优化版）
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proof51 柯承志
直角
ie 5
二次函數圖形測驗3
自製工具：CurveFit, Bezier
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Rational Numbers
Definite Integral
Trigonometric Functions
Statistical Characteristics
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