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重叠面积（平移问题）
Author:
张书真
GeoGebra
New Resources
三位數除以一位數（二）
直角坐標平面上的旋轉變換
畫出對稱圖形
算柱 (兩位數)
兩組對邊相等和有直角的四邊形
Discover Resources
rainbow
畫三角形 題4a
反正弦函數
Triangle 02
三視圖3d眼鏡
Discover Topics
Root
Terms
Division
Vectors 2D (Two-Dimensional)
Secant Line or Secant