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project euler202（反射光线路线数）
Author:
朱亮
GeoGebra
New Resources
畫出對稱圖形
【案例】2018年全国1卷理科12题
球体的体积推导（优化版）
兩位數除以一位數（二）
球體建築師
Discover Resources
外公切線作圖
Primeter
量度長度(厘米)
Sonia and Julie
烟囱
Discover Topics
Natural Numbers
Expected Value
Exponential Functions
Statistics
Geometry