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Author:
junfeilx
GeoGebra
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算柱 (兩位數)
異分母分數減法
四邉形 (四年級) 教師版
兩位數除以一位數（二）
第八周作业
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乘法公式2
Trisectin the cube into 3 pyramids
Exploring the changes in mean and median
證平行四邊形 (對邊相等)
複數：正方形內的正方形
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Indefinite Integral
Addition
Sphere
Pyramid
Rectangle