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Orthocentre

Author:uccke

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兩位數除以一位數（二）
兩組對邊相等的四邊形
【案例】圆柱体内放置一个大球六个小球
錐體建築師
四邊形的特性

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賺賠：例1
向量相加
配方法 Completing the Square
三次函數01
椭圆的定义

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Right Triangles
Parallelogram
Geometry
Isosceles Triangles
Expected Value

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