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围棋（可摆盘、双人对战，不可人机对战）
Author:
阳光
Topic:
Constructions
GeoGebra
New Resources
三位數除以一位數（二）
球體建築師
兩位數除以一位數（二）
兩位數除以一位數（一）
四邉形 (四年級) 教師版
Discover Resources
P63-2
平行四邊形
ego-motion
Locus (Two points 2)
Angle at centre twice angle at circumference
Discover Topics
Addition
Arithmetic Mean
Dilation
Median Line
Numbers