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3 perpendicular theorem 01
Author:
tcchan
GeoGebra
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三位數除以一位數（一）
異分母分數減法
判斷球體
三位數除以一位數（二）
兩位數除以一位數（一）
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四心的變化II
路徑一動畫
相似結合畢氏定理問題
兩弦的長度比較
弹簧测力计
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Subtraction
Addition
Solids or 3D Shapes
Cylinder
Quadrilaterals