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任务9：内凹的正方形
Author:
陈丽婷
GeoGebra
New Resources
柱體建築師
算柱 (兩位數)
兩位數除以一位數（一）
【案例】圆柱体内放置一个大球六个小球
三位數除以一位數（二）
Discover Resources
正六面體
圓周角與圓心角的關係
Reflectionnn
Centroid
projection02 by Mr LO WY
Discover Topics
Parabola
Coordinates
Congruence
Curve Sketching
Complex Numbers