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Author:
俞光隆
GeoGebra
New Resources
柱體建築師
兩位數加法
四邊形的特性
畫出對稱圖形
錐體建築師
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一題多解,托勒密,代數,三角,柯西,鍾元杰
光芒之星
用 Geogebra 模擬日照、影長變換
new book
閱讀鐘面及數字鐘（時和分）的副本
Discover Topics
Statistical Characteristics
Poisson Distribution
Kite
Similar Triangles
Division