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Orthocentre

Author:Big Lee

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兩組對邊相等的四邊形
三位數除以一位數（一）
兩位數加法
画直线等分三角形的面积
柱體建築師

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橢圓
Ex10.1 q13
長方形的對稱軸
淘宝网
任務4的副本

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Median Line
General Quadrilateral
Translation
Trigonometry
Calculus

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