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七巧板奔人2
Author:
李春培
七巧板奔人2
GeoGebra
New Resources
兩位數加法
異分母分數減法
四邊形的特性
拼砌四邊形
球體建築師
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多邊形
梯形
雙曲線之極偶 / polarity for hyperbola
中位线问题
周长相等，正方形，长方形和正三角形，圆面积大小比较
Discover Topics
Parallelogram
Means
Quadrilaterals
Geometry
Arithmetic