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弹簧振子（圆频率）
Author:
吴志敏
GeoGebra
New Resources
找出對稱軸
兩組對邊相等的四邊形
sanjiaohanshu
拼砌四邊形
四邊形的特性
Discover Resources
z=x^2-y^2
ttttt
导数
将三角形面积一分为二
三等分点连线围成的三角形特征（唐老师）
Discover Topics
Perimeter
Linear Equations
Frequency Distribution
Upper and Lower Sum or Riemann Sum
Similar Triangles