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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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兩位數加法
兩位數除以一位數（一）
四邉形 (四年級) 教師版
第八周作业
拼砌四邊形
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多項式函數
Similar triangles in a triangle
transformation_translation
Copy of 作業-太極
三角形内角和
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Probability
Mathematics
Rhombus
Unit Circle
Arithmetic