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Orthocentre

Author:Big Lee

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異分母分數減法
錐體建築師
三位數除以一位數（二）
第八周作业
球體建築師

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雨刷練習
分段函數作圖教學
so fing
任意三角形
麻之葉

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Mode
General Quadrilateral
Logic
Geometric Distribution
Similar Triangles

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