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光的折射（光线自右下向左上）
Author:
樊双平
GeoGebra
New Resources
第八周作业
兩位數加法
判斷球體
兩組對邊相等和有直角的四邊形
拼砌四邊形
Discover Resources
拿破崙三角形
費氏螺旋 (基本作圖)
二次函數
ghseh 二次函數描點法左右平移-4
圓形移動面積
Discover Topics
Statistics
General Quadrilateral
Incircle or Inscribed Circle
Distributions
Trapezoid