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抛物线定义
Author:
周成涛
Topic:
Conic Sections
GeoGebra
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三位數除以一位數（二）
算柱 (兩位數)
三位數除以一位數（一）
兩位數除以一位數（二）
拼砌四邊形
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KidEdu
旋轉動畫
GGB3
P5三角形的面積
完全图
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Linear Programming or Linear Optimization
Boxplot
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Algebra