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Big Lee
GeoGebra
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拼砌四邊形
算柱 (兩位數)
【案例】2013年安徽高考15题
兩位數除以一位數（一）
錐體建築師
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正四面體的反射對稱
CACTM對稱及變換
函數、方程式、參數式
shuipen
欧拉线
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Algebra
Arithmetic
Expected Value
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Rhombus