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重心
Author:
詠甯
重心
GeoGebra
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近似值：有效數字
兩組對邊相等的四邊形
兩組對邊相等和有直角的四邊形
兩位數除以一位數（一）
判斷球體
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三角形面積
定积分的概念
Copy of 峯01
畢氏定理證明
圓錐截痕模型
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Perimeter
Percentages
Isosceles Triangles
Diagrams
Rectangle