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椭圆的定义

Author:guomenglin

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柱體建築師
兩組對邊相等和有直角的四邊形
拼砌四邊形
【案例】2018年全国1卷理科12题
【案例】2013年安徽高考15题

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labyrinth
Quiz on Centres of Triangles 三角形的中心：測驗
二次函数动点问题25
拋物線3--平行四邊形法
数线段

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Tangent Function
Centroid or Barycenter
Inequalities
Similar Triangles
Symmetry

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