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若隐若现的白点
Author:
许业成
GeoGebra
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兩組對邊相等的四邊形
三位數除以一位數（二）
兩位數加法
兩組對邊相等和有直角的四邊形
判斷球體
Discover Resources
Roger Test Draw
艾雪鑲嵌
Lituus
圓周公式應用題2的副本
Fill the circle的副本
Discover Topics
Curve Sketching
Solids or 3D Shapes
Translation
Stochastic Process or Random Process
Circle