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菱形有甚麼特性？
Author:
Anthony OR 柯志明
English version:
http://ggbtu.be/m79847
GeoGebra
New Resources
兩組對邊相等的四邊形
拼砌四邊形
異分母分數減法
兩位數除以一位數（二）
第八周作业
Discover Resources
固定周界的長方形面積變化
n 次方根
asasd
轉彎的箭頭
販賣部草圖
生长弧
Discover Topics
Dilation
Coordinates
Equations
Numbers
Limits