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兩圓外公切線
Author:
郭逸民
GeoGebra
New Resources
兩位數除以一位數（一）
圓周公式的應用
球体的体积推导（优化版）
球体的体积推导
平行線的斜率
Discover Resources
[問題] 橢圓與雙曲線有共同焦點
HOMEWORK
GGB5
Graph of Cosine
双镜面反射问题
Discover Topics
Piecewise Functions
Definite Integral
Cylinder
Trigonometric Functions
Fractions