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周界平移
Author:
kwok ka yan
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lkkbmaths teachers 檔案儲存用
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四邉形 (四年級) 教師版
算柱 (兩位數)
兩位數除以一位數（一）
兩位數加法
兩組對邊相等的四邊形
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waaachen
幾何作圖動畫示範
蚂蚁在长方体表面爬行的最短路径问题
戴德林球
黄金螺线与向日葵-朱老师
勾股定理
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Median Line
Sequences and Series
Cube
Multiplication
Unit Circle