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光圈与正多边形外角和
Author:
赵林
Topic:
Polygons
GeoGebra
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画直线等分三角形的面积
球体的体积推导（优化版）
兩位數除以一位數（一）
異分母分數減法
兩位數加法
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task7
橢圓教學_2016
ctr to mid perd
畢氏定理
圆面积公式推导
Discover Topics
Translation
Calculus
Piecewise Functions
LCM and GCD
Complex Numbers