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兩圓外公切線
Author:
郭逸民
GeoGebra
New Resources
判斷球體
三位數除以一位數（一）
異分母分數減法
兩位數除以一位數（二）
兩組對邊相等的四邊形
Discover Resources
門格海綿 (Menger Sponge)
Triangle Inequalities
四邊形特性
梯形面積 Area of Trapezium
軌跡觀察
Discover Topics
Similarity Transformation or Similarity
Linear Programming or Linear Optimization
Logic
Arithmetic Operations
Stochastic Process or Random Process