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公切線的條數
Author:
李春培
公切線的條數
GeoGebra
New Resources
球體建築師
兩位數除以一位數（一）
柱體建築師
兩組對邊相等和有直角的四邊形
算柱 (兩位數)
Discover Resources
圓面積計算
橢圓
二項分布 (黑板)
三角函數sine跟cosine
箭头平移
Discover Topics
Prism
Optimization Problems
Ratios
Translation
Random Variables