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光的折射（光线自右下向左上）
Author:
樊双平
GeoGebra
New Resources
兩組對邊相等的四邊形
錐體建築師
異分母分數減法
兩組對邊相等和有直角的四邊形
判斷球體
Discover Resources
最短
平面幾何的思考
數學電腦繪圖與解題
拼出三角形
可控九九乘法口诀表
Discover Topics
Dilation
Symmetry
Hyperbola
Circumcircle or Circumscribed Circle
Sine