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1977河北2
Author:
常振虎
GeoGebra
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四邊形的特性
柱體建築師
兩位數除以一位數（一）
兩位數加法
找出對稱軸
Discover Resources
吳老師幾何題
百分數（小學）：折扣 / 賺賠（Java 版）
兩圓外公切線
錐體的橫截面
圓周_心算題03
Discover Topics
General Quadrilateral
Symmetry
Piecewise Functions
Parametric Curves
Cosine