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definition of trigo
Author:
sealion1215
GeoGebra
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兩位數加法
畫出對稱圖形
兩組對邊相等和有直角的四邊形
画直线等分三角形的面积
判斷球體
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放射狀圖形(1)
HKDSE 2015 by Mr LO WY
三年級除法(四)：一位數除三位數
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四邉形 (四年級) 教師版
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Calculus
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