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重心
Author:
cherry910502
GeoGebra
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兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
【案例】2013年安徽高考15题
【案例】圆柱体内放置一个大球六个小球
算柱 (兩位數)
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立體幾何
廣義角的代換(90,270)
Direct and Inverse Variation 正變與反變
My second work
冰淇淋
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Percentages
Equilateral Triangles
Trigonometry
Polygons
Mathematics