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错觉：挤出一块小空间
Author:
靳道阳
GeoGebra
New Resources
兩位數除以一位數（二）
直角坐標平面上的旋轉變換
拼砌四邊形
畫出對稱圖形
判斷球體
Discover Resources
y=x sin(1/x) 的圖形
切割正二十面體(直)
銳角、直角和鈍角
Larry's Clock
学用数学（分季）
Discover Topics
Piecewise Functions
Coordinates
Matrices
Ratios
Step Functions