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三位數除以一位數（二）
找出對稱軸
算柱 (兩位數)
兩組對邊相等的四邊形
畫出對稱圖形
Opdag Ressourcer
圓面積計算
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Apollonius Problem 7 CCP Inversion simple
第1章知识结构框图
Copy of 球面
Udforsk emner
Forhold
Keglesnit
Indskreven cirkel
Differentialligninger
Regning