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四邊形ADFE的面積是多少？

Author:hjyanghj

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畫出對稱圖形
拼砌四邊形
画直线等分三角形的面积
異分母分數減法
算柱 (兩位數)

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圓的基本慨念
斯坦納-雷米歐司(Steiner-Lehmus)定理證明一
堆疊
三角碎形
project euler202（反射光线路线数）

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Interest Calculation
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