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Author:
Henry Leung
GeoGebra
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近似值：有效數字
GeoGebra笔记功能体验课件
畫出對稱圖形
三位數除以一位數（一）
小数 的副本
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Dividing a Trapezium
glt-h02-00-正方形折成三角錐
柯西不等式 (3)
旁心
第四次:20190308
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Square
Addition
Curve Sketching
Volume
Functions