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圆与它的圆
Author:
陈坚昌
GeoGebra
New Resources
三位數除以一位數（二）
【案例】2013年安徽高考15题
兩位數加法
讀磅
【案例】2018年全国1卷理科12题
Discover Resources
反射原理
Locus指令的練習
動態畢氏定理
group m
Angle of elevation and Angle of depression(仰角和俯角)
Discover Topics
Matrices
General Quadrilateral
Unit Circle
Tree Diagrams
Conic Sections