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Author:
许业成
GeoGebra
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判斷球體
柱體建築師
画直线等分三角形的面积
兩位數除以一位數（二）
兩位數除以一位數（一）
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內切圓半徑證明
平行四邊形
Circumference 圓周
截痕
兩條直線垂直應用
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Root
Cylinder
Linear Equations
Trapezoid
Constructions