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S0E8 一线三等角
Author:
Atom
GeoGebra
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找出對稱軸
兩位數除以一位數（一）
四邉形 (四年級) 教師版
兩組對邊相等和有直角的四邊形
【案例】圆柱体内放置一个大球六个小球
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平面幾何
reflectional symmetry_3
正六角錐(旋轉，實體、透視)
有多少正方体
翰林數學_2下_CH3-4_扣條
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Polygons
Prism
Means
Quadratic Equations
Inequalities