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Author:
鍾青府
GeoGebra
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兩組對邊相等的四邊形
異分母分數減法
兩位數除以一位數（二）
球體建築師
四邉形 (四年級) 教師版
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Is this a prism 2
Distributive Law of Multiplication 2 (乘法的分配率 2)
二次函数动点问题25
Hamid Naderi Yeganeh Ellipse2
基础知识
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Intersection
Arithmetic Mean
Logarithmic Functions
Straight Lines
Quadratic Equations