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橢圓動畫
Author:
chen mingchuan
GeoGebra
New Resources
異分母分數減法
三位數除以一位數（一）
四邊形的特性
兩位數加法
算柱 (兩位數)
Discover Resources
心型線
Spherical Spiral
PMC 2016-17
arithmetic operation
弧度制的由来
Discover Topics
Random Experiments
Circumcircle or Circumscribed Circle
Fractions
Cone
Translation