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refraction law
Author:
goldengrape
调整参数： 入射角 n1折射率 n2折射率
GeoGebra
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兩組對邊相等和有直角的四邊形
異分母分數減法
找出對稱軸
三位數除以一位數（二）
四邉形 (四年級) 教師版
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test
正立方體
不规则图形平移
纏繞畫1
均分除法（整數÷整數）的副本
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Exponent
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