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直线与平面垂直的折纸实验
Author:
孟宝兴
GeoGebra
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三位數除以一位數（一）
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找出對稱軸
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waaachen
ghseh 二次函數上下y值差
P.4對稱
椭圆内光的反射作图步骤
翰林數學_2下_CH3-1_對頂角必相等
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Cube
Line Segment
Cuboid
Root
Division