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水波干涉
Author:
dunst kang
GeoGebra
New Resources
找出對稱軸
錐體建築師
球體建築師
兩位數除以一位數（二）
兩組對邊相等和有直角的四邊形
Discover Resources
史坦納圓 (Steiner Circle)
香港貨幣
ghseh 二次函數描點法左右平移-1
二元一次方程式及其解的意義
兩位數乘兩位數直式
Discover Topics
Differential Calculus
Rhombus
Square
Translation
Tangent Function