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五圓相切
Author:
susan
兩兩相切
GeoGebra
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三位數除以一位數（二）
算柱 (兩位數)
拼砌四邊形
畫出對稱圖形
判斷球體
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了解圓方程(0)
製作及設計繡曲線
三角形
旋轉對稱
线性方程组
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Trigonometry
Arithmetic Mean
Similar Triangles
Inequalities
Rational Numbers