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九點共圓

Author:廖奕翔

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柱體建築師
錐體建築師
異分母分數減法
兩位數加法
三位數除以一位數（一）

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旁心三角形的九點圓
同位角
Travelling Waves
折長方形 62326虹圻
兩位數除兩位數(例子二)

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Translation
Similar Triangles
Linear Programming or Linear Optimization
Rotation
Statistics

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