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祖暅原理
Author:
孟宝兴
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
四邉形 (四年級) 教師版
異分母分數減法
球体的体积推导（优化版）
兩位數加法
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旁心
圆的面积展开的副本
随机分支长度的二分树的副本
Copy of 愛心
尺规作图得到黄金三角形和黄金矩形
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Sequences and Series
Kite
Unit Circle
Fractions
Curve Sketching