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兩圓外公切線
Author:
郭逸民
GeoGebra
New Resources
画直线等分三角形的面积
三位數除以一位數（二）
畫出對稱圖形
【案例】圆柱体内放置一个大球六个小球
兩組對邊相等和有直角的四邊形
Discover Resources
T2 Geobra
Quiz on Projection of a Line Segment on a Plane 投影：測驗
圆与它的外切圆
乘法的副本
含有任意量词与存在量词的最值问题
Discover Topics
Differential Equation
Pie Chart or Circle Chart
Cube
Division
Congruence