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厚會聚透鏡 Thick Convergent Lens
Author:
W.L. Wong, Albert
GeoGebra
New Resources
多邊形的面積
球体的体积推导（优化版）
垂直線的斜率
【案例】2013年安徽高考15题
兩位數除以一位數（一）
Discover Resources
Special Lines & Centres of Triangles 三角形的特殊線和中心
比流器3相連接方法--U,Z,Y,Δ
先估算，後看解釋
函數圖形
較複雜的周界問題(一)
Discover Topics
Straight Lines
Probability
Similar Triangles
Arithmetic Operations
Quadratic Equations