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餘弦定理
Author:
yuchengda
GeoGebra
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柱體建築師
兩位數除以一位數（一）
算柱 (兩位數)
GeoGebra笔记功能体验课件
兩組對邊相等的四邊形
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平面截距式
三角形3,4,5
ex 7
作线段和角
圆链的反演
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Orthocenter
Conic Sections
Calculus
Trapezoid
Histogram