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包絡線：橢圓

Author:羅驥韡 (Pegasus Roe)

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兩組對邊相等的四邊形
【案例】2018年全国1卷理科12题
拼砌四邊形
兩位數除以一位數（二）
找出對稱軸

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三角形的外角等于与其不相邻的两个内角之和
Comparing_fraction
Arithmetic Series 等差級數
常见几个曲面
多边形的外角和

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Equations
Numbers
Linear Equations
Derivative
Dilation

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