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球的内接正四棱锥
Author:
冯德福
GeoGebra
New Resources
【案例】2013年安徽高考15题
【案例】2018年全国1卷理科12题
兩組對邊相等的四邊形
兩位數加法
畫出對稱圖形
Discover Resources
補角關係
異分母的分數加減
欢度春节（灯笼）
臺北區104-2
学习计算器套件
Discover Topics
Percentages
Linear Programming or Linear Optimization
Trapezoid
Prism
Root