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凹正方形
Author:
王玉霞
GeoGebra
New Resources
三位數除以一位數（一）
兩位數除以一位數（二）
畫出對稱圖形
兩位數加法
異分母分數減法
Discover Resources
Properties of a Rhombus
some circles
镂空菱形六十面体
圓周_心算題01
腾讯动漫
Discover Topics
Confidence Interval
Constructions
Normal Distribution
Frequency Distribution
Planes