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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
New Resources
兩位數除以一位數（一）
球體建築師
兩組對邊相等的四邊形
三位數除以一位數（一）
兩位數加法
Discover Resources
大福彩開獎機
x to 1/5 Integration
Ellipse_Horizontal
QQ空间
二次函數的圖形的副本
Discover Topics
Numbers
Exponential Functions
Cone
Straight Lines
Linear Regression