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Author:
tai hiu wai
GeoGebra
New Resources
異分母分數減法
画直线等分三角形的面积
四邊形的特性
三位數除以一位數（一）
找出對稱軸
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雜類,其他
迪卡兒送給公主的信
容積盒子(加蓋)
三角形四心
拋物線軌跡
滑轮组2
Discover Topics
Step Functions
Means
Solids or 3D Shapes
Complex Numbers
Differential Equation