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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
判斷球體
畫出對稱圖形
三位數除以一位數（二）
第八周作业
兩位數除以一位數（二）
Discover Resources
拼圖遊戲
正六面體摺疊
button
霓虹燈
圓錐曲線的光學性質
Discover Topics
Bar Chart or Bar Graph
Arithmetic Operations
Mode
Curve Sketching
Diagrams