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Dandelin双球证明圆锥曲线之椭圆

Author:平旭洋

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找出對稱軸
拼砌四邊形
sanjiaohanshu
算柱 (兩位數)
Earth with coastline

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test
判斷錐體 4
圓內接正N邊形
平面幾何的思考
根據百分率找數量（二）: 例3的副本

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