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平行四邊形的特性
Author:
Yip Chi Wai
GeoGebra
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三位數除以一位數（一）
拼砌四邊形
異分母分數減法
兩位數加法
兩組對邊相等和有直角的四邊形
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三角形的三角和及外心、內心圓
正立方體變菱形12面體
正十二面體內接正六面體旋轉
題 2
角谷猜想
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Step Functions
Constructions
Indefinite Integral
Hyperbola
Expected Value