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Author:
孟宝兴
GeoGebra
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近似值：有效數字
畫出對稱圖形
直角坐標平面上的旋轉變換
拼砌四邊形
算柱 (兩位數)
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畢氏定理
GeoGebra桌機版安裝
S3 Ex4.3 Q01(3D圖)
數字鐘 的複本
長方形的周界與長和闊的關係 (學生版)
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Matrices
Trigonometry
Ellipse
Surface
Rational Numbers