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refraction law
Author:
goldengrape
调整参数： 入射角 n1折射率 n2折射率
GeoGebra
New Resources
兩組對邊相等的四邊形
異分母分數減法
三位數除以一位數（一）
柱體建築師
算柱 (兩位數)
Discover Resources
挑战中考压轴题
双曲线
立體圖形
PMC 2017-18
Copy of 製作組織圖
Discover Topics
Differential Calculus
Geometric Transformations
Interest Calculation
Parallelogram
Geometric Mean