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點到直線距離4：同心圓擴大
Author:
arist
GeoGebra
New Resources
画直线等分三角形的面积
球體建築師
四邉形 (四年級) 教師版
三位數除以一位數（一）
判斷球體
Discover Resources
九點圓
分數除法
指數的對稱
regtrg
加减法练习
Discover Topics
Inequalities
Multiplication
Area
Statistical Characteristics
Random Variables