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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
New Resources
三位數除以一位數（二）
GeoGebra笔记功能体验课件
兩位數除以一位數（二）
sanjiaohanshu
直角坐標平面上的旋轉變換
Discover Resources
排列組合
圓上圓
空間坐標
justin sin
tan90
Discover Topics
Pie Chart or Circle Chart
Tree Diagrams
Confidence Interval
Intersection
Numbers