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任務2的副本
Author:
童话
,
gklwong
三角形
GeoGebra
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畫出對稱圖形
找出對稱軸
三位數除以一位數（一）
錐體建築師
兩組對邊相等和有直角的四邊形
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正立方體與正三角錐
二次函數04
区域积分例子
題二
Angles in a Circle:Property 1
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Probability
Statistical Characteristics
Vectors 3D (Three-Dimensional)
Quadratic Equations
Circle