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平行四邊形有甚麼特性？
Author:
Anthony OR 柯志明
Topic:
Parallelogram
English version:
http://ggbtu.be/m79826
GeoGebra
New Resources
錐體建築師
第八周作业
兩位數除以一位數（二）
画直线等分三角形的面积
四邉形 (四年級) 教師版
Discover Resources
sin&cos
分數與小數
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周界-平移法(練習三)
三角形面積
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