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平移動畫(平移加滑桿)
Author:
Ching-Hui Chou
GeoGebra
New Resources
異分母分數減法
三位數除以一位數（一）
算柱 (兩位數)
拼砌四邊形
兩組對邊相等的四邊形
Discover Resources
Drawing quadrilaterals on the grid or the pinboard
畢式定理 (06)
Lens
(006)80102
图中的三角形面积何时最小？（许兴华数学）
Discover Topics
Surface
Similarity Transformation or Similarity
Upper and Lower Sum or Riemann Sum
Area
Quadrilaterals