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平行四邊形

Author:Ching-Hui Chou

Topic:Parallelogram

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三位數除以一位數（二）
兩組對邊相等的四邊形
四邉形 (四年級) 教師版
兩位數加法
【案例】2013年安徽高考15题

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Irregular shape
真分數、假分數和帶分數
tetrahedron rotational symmetric
與兩圓相切之圓心雙曲線軌跡
輪子轉動問題_求直徑和半徑

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Numbers
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