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黎曼和
Author:
sheri.chen
GeoGebra
New Resources
画直线等分三角形的面积
兩位數加法
找出對稱軸
兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
Discover Resources
七巧板（tangram）
How to draw a triangle with ruler and compasses?
Center_Circle_Solution
跳動的愛心－平面
旋轉的概念
Discover Topics
Median Line
Planes
Cube
Standard Deviation
Mode