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練習
Author:
夏天
練習
GeoGebra
New Resources
算柱 (兩位數)
畫出對稱圖形
異分母分數減法
球體建築師
三位數除以一位數（一）
Discover Resources
concurrence of medians and bimedians of tetrahedron
生活中的平面圖形關係─平分
五角星
比較角的大小2
找规律（数阵与点阵）
Discover Topics
Optimization Problems
Hypergeometric Distribution
Parametric Curves
Cuboid
Polygons