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一元二次方程求根公式
Author:
梁航宇
GeoGebra
New Resources
画直线等分三角形的面积
兩組對邊相等的四邊形
畫出對稱圖形
三位數除以一位數（二）
兩位數加法
Discover Resources
folding aeroplane
多項式函數
正方形截痕
日照图
M2: disc/shell
Discover Topics
Equations
Set Theory
Division
Complex Numbers
Centroid or Barycenter