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Author:
cktsang
permutation (chi. ver.)
GeoGebra
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四邉形 (四年級) 教師版
畫出對稱圖形
判斷球體
三位數除以一位數（二）
兩位數除以一位數（一）
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vbcvbcvbcvbcvbcvcv
test02繪本用
Copy of 圓周公式應用題2
圖解直式開方
畢氏定理證明
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Frequency Distribution
Square
Random Experiments
Planes
Straight Lines