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正八面體
Author:
黃國斌
GeoGebra
New Resources
画直线等分三角形的面积
兩位數加法
拼砌四邊形
畫出對稱圖形
球体的体积推导（优化版）
Discover Resources
龍騰4習作
重複組合
動圓定圓兩圓內切動圓圓心軌跡
外心
俄罗斯方块
Discover Topics
Step Functions
Ratios
Definite Integral
Limits
Statistical Characteristics