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Author:
李怡
GeoGebra
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兩位數加法
三位數除以一位數（一）
畫出對稱圖形
找出對稱軸
兩組對邊相等和有直角的四邊形
Discover Resources
小學數學科 HTML5 Applets
Line Perpendicular to Plane 垂直於平面的直線
硬幣
任何三角形內角和180度(五上數翰４－２)
迭帶
Discover Topics
Orthocenter
Percentages
Fractal Geometry
Geometric Distribution
Square