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練習－由一元二次方程判別根的數目
Author:
Lau Sir
GeoGebra
New Resources
四邊形的特性
球体的体积推导（优化版）
【案例】圆柱体内放置一个大球六个小球
畫出對稱圖形
錐體建築師
Discover Resources
clock
九點圓
Measuring Volume 1
Copy of 小數的認識
Copy of 正多边形内接迭代
Discover Topics
Geometry
Frequency Distribution
Plane Figures or Shapes
Set Theory
Pythagoras or Pythagorean Theorem