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兩圓外公切線

Author:郭逸民

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画直线等分三角形的面积
兩組對邊相等的四邊形
判斷球體
第八周作业
異分母分數減法

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Tessellations
proof76 謝旻辰
選修數學
堆疊正立方體的副本
圆锥曲线折纸操作题（教材案例）

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Geometric Distribution
Distributions
Linear Functions
General Quadrilateral
Geometry

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