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橢圓動畫
Author:
chen mingchuan
GeoGebra
New Resources
兩位數加法
異分母分數減法
兩位數除以一位數（二）
兩組對邊相等的四邊形
拼砌四邊形
Discover Resources
錐體建築師 4
透視
拋物線1--焦點法
学习计算器套件
多普勒效应动态演示
Discover Topics
Perimeter
Diagrams
Linear Equations
Function Graph
Quadratic Equations