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Author:
李春培
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GeoGebra
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兩組對邊相等的四邊形
四邊形的特性
兩組對邊相等和有直角的四邊形
兩位數除以一位數（二）
異分母分數減法
Discover Resources
艾雪鑲嵌
畢氏定理拼圖007(8片)
圆周长演示
海宇的第一个GGB绘本
二階克拉瑪公式_找y
Discover Topics
Upper and Lower Sum or Riemann Sum
Set Theory
Surface
Arithmetic Operations
Constructions