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光的折射（光线自右下向左上）
Author:
樊双平
GeoGebra
New Resources
近似值：有效數字
畫出對稱圖形
球體建築師
第八周作业
找出對稱軸
Discover Resources
優良作品8(宜庭)
Measuring Volume 5
我不知道我在幹嘛
扇形面積公式
Copy of 作業-太極
Discover Topics
Algebra
Quadratic Equations
Combinatorics
Rotation
Special Points