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GeoGebra
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2012
Author:
Alvinwo
GeoGebra
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異分母分數減法
兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
畫出對稱圖形
柱體建築師
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人造「四腳獸」？
任意角的三角比
小五面積
大黨小黨－政黨票的掙扎
立方体的11种展开图
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Quadrilaterals
Translation
Mode
Frequency Distribution
Bar Chart or Bar Graph