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固定周界的長方形的面積變化（周界是200厘米）
Author:
李寶玲
,
GeoGebra Institute of Hong Kong
GeoGebra
New Resources
判斷球體
sanjiaohanshu
算柱 (兩位數)
四邊形的特性
美國國旗 (Codex 版)
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Quiz on Interior & Exterior Angles of Triangles 三角形內角和及外角：測驗
時鐘與數學
圓柱體斜切塊體積
畫鐘面的副本
三角形重心的变化2.许兴华数学
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Poisson Distribution
Similarity Transformation or Similarity
Piecewise Functions
Geometric Distribution
Orthocenter