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Viviani's curve
Author:
Chenwei Chen
GeoGebra
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兩組對邊相等的四邊形
兩組對邊相等和有直角的四邊形
畫出對稱圖形
兩位數除以一位數（一）
球体的体积推导
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斜線2
資料統計
基础知识
双曲线的定义.许兴华数学
我的第一个绘本
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Root
Combinatorics
Boxplot
Quadratic Equations
Geometric Transformations