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足迹
Author:
孟宝兴
足迹
GeoGebra
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平行線的斜率
正方形雪花图案
双心四边形
龙形曲线-分形龙2
祖冲之的期望：内棋与外棋
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Quiz on Quadratic Formula 二次公式：測驗
正四面體
三節棍
sin(x) 的函數圖形的副本
三阶魔方（magic cube）
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Algebra
Geometric Distribution
Combinatorics
Fractions
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