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几何模版：倍长中线
Author:
树常青
GeoGebra
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斜率的值
撒针估算面积实验
圓的基本性質
龙形曲线-分形龙
三角函数 的副本
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三角形的构成
正三角形
Ex5C#6
彩色立体方阵、点阵
动点
Discover Topics
LCM and GCD
Curve Sketching
Congruence
Distributions
Limits