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chen mingchuan
GeoGebra
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柱體建築師
兩位數加法
四邉形 (四年級) 教師版
兩組對邊相等的四邊形
三位數除以一位數（二）
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waaachen
最小距離和
立體三角測量(例五)
碎形
蛇行腳踏車
Discover Topics
LCM and GCD
Pyramid
Area
Differential Equation
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