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固定面積的圖形周界變化
Author:
phcheng
,
GeoGebra Institute of Hong Kong
GeoGebra
New Resources
三位數除以一位數（一）
兩位數加法
第八周作业
拼砌四邊形
三位數除以一位數（二）
Discover Resources
volleyball throughing
Fractal Roulette
旁心
不存在的梯子
橢圓的副本
Discover Topics
Triangles
Plane Figures or Shapes
Rotation
Intersection
Indefinite Integral