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Author:
余銘芬
GeoGebra
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算柱 (兩位數)
拼砌四邊形
三位數除以一位數（二）
【案例】圆柱体内放置一个大球六个小球
球體建築師
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How to draw an ennegon with ruler and compasses?
圖形周界_2
跳動的愛心－立體版
辽南协作校10题
折扣 例3的副本
Discover Topics
Parallelogram
Derivative
Optimization Problems
Statistical Characteristics
Triangles